CLOSED: SRT Engineers Roundtable: 08/05/09

[DMAG]

SRT Engineers Round Table Discussion

Wednesday, August 5th 6pm - 8pm

The ground rules:


First off, the SRT Engineers take time out of their busy schedule making go fast goodies to be here to answer our questions. Let's show them the proper courtesy and patience. There will be many questions and they may not be able to answer every question asked. If your question is skipped, please be patient as questions are not answered in order.


Please only ask one or two questions. There are lots of people who want to ask questions, so let's give everyone a chance.


Stay on the topic at hand. SRT Vehicles! Keep the off-topic chat to the other sections of the website. There is to be no discussion between members in this forum. Ask your question and enjoy the replies from the Engineers!


If your question has already been asked (by you or someone else). Don't re-post it in hopes to get it answered quicker.


Make sure you let the SRT Engineers know what model SRT vehicle you are driving or inquiring about. Yes, a head gasket is quite different between an SRT8 and an SRT4. ;)


As much as everyone is salivating over what comes in the future, the SRT Engineers cannot answer any questions regarding future product. This INCLUDES 2010 line products.



This thread is now open so you can start posting your questions.

[DMAG]

Thread is open! ASK AWAY!!!

Remeber: Please only ask questions for the SRT Engineers. (and do not post until you know your question!) :)

[da BoMM]

Please explain the oil specification of Mobil1 0W40 --

seems that 5W40 or 10W40 covers the same ground for most ambient temperature applications.

part 2: will SRT authorize or waive the 0W40 to allow use of Synthetic 10W40 or 5W40? (especially in Texas where the low ambient is 25 degrees F)

my car: 07 MSRT8 x 2

[hemibeesteve]

What are the 09 axels rated at horsepower wise?

[CT-MSRT]

SRT Half Shafts. Years 05-08.

I understand there were some issues during production that caused breakage on stock vehicles due to some batches being weaker than others.

1: Were these mostly experienced during 05-06 since it was a new product or was it continuous and was the problem with improper heat treat solved in later years?
2: Is this problem based on a batch to batch circumstance where a bunch of cars made a certain times will have weaker half shafts than those produced at other times?

[Flanman]

I had a Manley exhaust valvespring break when I was out at the LX and Beyond Nats a couple of weeks ago. It broke on my last run down the track. We (the Hemi community) have had problems with Comp Cams springs in the past and are now having problems with Manley springs. Does Mopar Performance have a spring that will work this cam? And if so, why is it better than the Comp or Manley?

http://i43.photobucket.com/albums/e361/DennisFlanagan/Magnum%20build/IMG_0194.jpg

[MarylandSRT8]

Initially our 6.1L were designed to use 0W40 Mobil 1, its on the oil cap and in the SRT's car manual. The bankruptcy brought about a falling out with Mobil 1, now all the dealerships are using 5W40 in the SRT 6.1L motor. From an engineering perspective is this change OK for the 6.1L? Why the change in viscosity? Thank you.

[BlazeHemi]

Can you please give me the production numbers for the Canadian Magnum SRT8s. I own a 2006 Inferno Red Magnum SRT8. I have heard that there was 666 Inferno Red Magnum SRT8's in 2006, does that include the Canadian ones?

[fargo59]

Thanks again for attending LX&Beyond, and for the chat session Saturday night. Anyway, id like to carry over some questions that were made there about the 226 getrag rear differential.
Clutches, could we get a repair clutch kit number produced, or shim kits to make the packs tighter?
Rear drive shaft. Currently its required to buy the entire drive shaft. Can we get a rear section only number supplied?

[DMAG]

Not a technical question, but one we'd all like to know the answer to.

We realize with corporate structures, there comes budgets (some smaller then others, especially in these rough economic times). What features of the SRT vehicles (specifically the LX platform SRT vehicles) got left on the cutting room floor? What features did you want to see added to the SRT's that the budget did not allow for? (minor/major).

Thanks again for bringing your knowledge and expertise to LXForums! :)

[MAGFX]

Thanks again for the chat in Ohio and welcome to our forums.

Where can we get all the parts to the LX SRT8 Brembo calipers , separately, i.e. pistons, pressure seals, mating grommets (front), etc.?
I did get some dust seals through Chrysler parts.

Thanks...Jonn

[Curt@BMCPerformance]

Will the challenger be offered in a sublime green color?

[1fastsedan]

First off, THANK YOU for doing this chat here on lxforums. I realize that this is outside of the original design specs of the 6.1, but we have quite a few cars running boost around here. Several have had piston failures at the top ring land. These failures appear to be due to high heat causing the ring to go solid and arch up into the land.

We now have forged pistons with a thicker top ring land available to replace the stock piston. So how much boost do you think the stock rods can handle? I don't think we've seen an OEM connecting rod break without a piston failure first.

[351Freak]

1) What are the specific changes made to the Mopar TCM vs. stock ???

2) What are the commercially available software packages that allow the reprogramming of the Siemens TCM's that our cars use...and why have attempts by some programmers seemed to have been overwritten after some time ???

[xevilpetex]

Why did my powersteering pump explode while
a)doing a donut
b)staying in the powerband while driving on a road course
on an 07 SRT8 magnum

[Peter Parker]

Production numbers of the 2006 Crossfire SRT-6 (dealer order only) before it was phased out, not the 05... Seems to be around 50 units in existence and most were exported, give or take ~25?

[Cam]

The factory manual lists the ring gap specification for the 6.1 as: Top compression ring .0118 - .0157 and the second .0137 - .0236. I recently inspected a motor with 30K miles on it. The top ring was close to spec and measured .012 - .015 but the second ring averaged .036 - .039. Is it possible the second ring was gapped at the factory wider than spec or is this simply wear and the type of material used. On the 09 6.1’s, have the ring gaps or ring material been changed and if so, can you provide the specification?.

[SilverSpecial]

I have a question in regards to the Stock kicker audio system. Is the Stock amp the same as teh 77kick18 amp upgrade? Chryslers sales literature states that that stock kicker amp is 322 watts, and the 77kick18 is 368. Is there a difference?

[Speedy!]

1. If you could make 3 performance upgrades to a 2009 Challenger R/T 6 speed what would they be?

2. With the top ring being 3mm from the top of the piston, is there such a thing as a "safe" amount of boost in a supercharged application on the 5.7L motor, and if so what is the "safe" psi level? (assuming a proper tune of course).

3. If a Diablo Predator tune is put on the car, then flashed back to the stock tune, can dealer equipment see that tunes have been swapped back and forth?

[gr8crash]

*Question removed as it pretains to future products* -Robert

[DonH]

Brembo Brake Dust.

While attending an SRT Experience last year, one of the instructors mentioned they used a spray or compound on the rims to eliminate the build-up of brake dust on the rims. I never got a chance to re-connect with that instructor that day, do you know what they are using on the Experience cars for the brake dust problem?

Thanks.

Don

[Big Papi SRT8]

Thank you to all the SRT engineers for taking the time to answer all of our questions. I have truly enjoy my charger SRT8 from day one. Question is, why does this vehicle have so much hesitation when you step on the gas pedal? seems like it winds up and then shoots out. It feels like it builds up power, then realeses it.

[1BAD383]

Seeing that Chrysler isn't using Mobil 1 in the 6.1 Challengers, what weight and manufacture should we use. Just had the oil changed in my 08 Challenger at the dealer, and the receipt did not specify the weight or manufacture.

[bob long]

How many SRT8's have been manufactured in 2007; & what is the overall total produced?

Thank you.

[WGK]

Thanks again for all your time. From the SRT-4 I owned to now with the R/T Magnum, great job!! Of course I would love to know if the 6.4 Hemi has been canned but its a possible future product.

1.) Why has the MDS system not been added to the 6.1?
2.) Personally do you think that the VVT on the new gen 5.7 makes the older 5.7 not worth the time for a engine build or the older one less prone to failure?

[BilletTechnology]

Thank you SRT Engineers for taking time to answer questions.

I have one problem with my SRT-4 Caliber and I have taken it to 4 dealers here in South Florida and all of them tell me there is nothing wrong. My husband even had one of the mechanics in the car when it happened. Here is what it does:

I am driving the car and maybe make a hard turn right or cross the rail road tracks I hear a loud "pop" when this happens. Its up on the right side of the car toward the front. This can't be normal. What do you think it is??

Thanks for any help.

[MOPAR MAGNUM]

many srt8 owners use the diablo tuners to get max performance, my question is:1) will use of this tuner void my warranty? i'd like to buy one but i'm afraid of screwing up my pcm and my warranty. 2) if they work so well , why doesn't chrysler just tune the pcm's for max performance? (like the diablo)

[Bonez]

Thanks for being here for us!

I have heard of several '09 Challenger SRT's using excessive amounts of oil early on after taking delivery.(less than 3000 miles) Mine, for example, used about 1 1/2 quarts for the first 1100 miles. Is this something that will correct itself with a few more miles on the clock? And, also several owners have expressed concern about a blue puff of smoke from the exhaust upon startup of an already warmed up engine. Is this a problem, could you explain both answers please?

Thank you again!

[KBTECH]

First of all, hats off to you! These cars are fantastic! Great job guys! Absolutely love them!

There is a concern however maybe you could address. To date, we've had three different 6.1 SRT Challengers lose the Key Fob recognition and fail to start. One had to be towed to the dealership, and one dealership said there is no TSB, no recalls or communications of any kind regarding this from Chrysler. Not quite happy with this response, we went to another dealership where they said they found an intermittent problem and are now replacing one of the controllers. Is this going to be an issue in the future? Are the cars going to be recalled for this? Sort of unerving, worrying if the car will recognize the key fob in the middle of nowhere.

Thanks again for taking the time to answer some questions for us.

Regards,

Ken

[Hemissary]

We appreciate your involvement here on the forums, thank you!

SRT engineers have put forth various reasons as to why this cross brace exists in this location:

http://i441.photobucket.com/albums/qq139/LetItAllPass/IMG_0550.jpg

They include:

- to support the exhaust during factory assembly
- general body stiffness enhancement
- control support during front/rear impacts (serious crash event)

Can we get a definitive answer(s)? Thanks!

[Hemissary]

It has been suggested that the 09' SRT model year has significant changes to TCM code which detunes the level of performance compared to previous model years.

It also appears that the 06' (and earlier) platforms perform better than the 07' (and later) platforms in the same area (off the line - significant timing pulled immediately after tip-in/WOT). We are observing these parameter changes during datalogging...

Care to confirm/deny? Thanks!

[stevo440]

What areas on the SRT exhaust need the most attention to increase the performance of the total system, and what modifications specifically should be done to those areas?
Resonators, suitecase, cats, x-pipe, pipe dia. etc??? Brake down for each, specifics!!!!

Thanks BTW you created a great line of cars, keep up the great work.....

[wills dodge]

**Questions about future product deleted** -Robert

[DarthCharger]

Are all SRT8 intake manifolds interchangeable between models and year of manufacturer. For example, with the manifold from a 2009 Challenger SRT8 fit on a 2007 Charger SRT8? There appears to be some confusion regarding this interchangeability.
Thanks for coming to answer these and other questions. You all manufactured a tremendous ride so I got two of them as described previously in the example!

[HEMI-C]

I have been wondering what is next for the Viper V-10 Motor. Heard that production of the Viper has stopped and with all the R&I money spent in the new 8.4L motor will there be any other uses? What about the V-10 cahllenger concept? Any further improvements or progress on this? And fianlly what were the production numbers on the 2006 Dodge Ram SRT-10 Reg Cab Trucks? Can't find naything on this.

[Hemi31]

**User to user comments removed** -Robert

love ya E

-R

[ChargerGirl]

Thanks again for the opportunity to chat. I have an '06 Dodge Charger SRT, built in October of '05. It has just over 44k miles on it. I don't go offroading. For the past year, I've observed what sounds like brake squeal (like when you have excess dust) when I accellerate. I know its not the brakes, as I'm not using them, but I'm worried that it may be a suspension issue as it only seems to happen under noticeable weight transfer (front to back). Is there a known issue?

[Warlock]

First off, thanks for coming to the forums, and looking forward to you returning to the Advisory board.

My question is about something I have been working on for a couple years. I have been trying to get to work is a Viper Motor in my 05 Magnum. I have been driving myself and a few folks crazy due to I want everything to work properly, as if it was from the factory. I had asked about this back at the '08 Spring Festival. I got the response of 'It didn't pass front crash tests.' Now I have been told that there is a possibility of a 'swap in' kit.

Could you shed some light on how to do the electronics so everything is happy?
And if there is a 'swap in' kit available?

Thanks,
Rusty

[budoboy]

Is the belly pan on the SRT8 for aerodynamics only or does it serve some other purpose? Mine blew out at the end of a drag strip because I removed the brake ducts in the front bumper for better cooling and presumably the pressure built up inside the engine compartment.

[budoboy]

I know the production number question regarding various SRT vehicles keeps coming up. Why is this information unavailable when so many people seem to want it?

I heard something alluded to a while ago that this was proprietary information that for some reason the competitors could use. Is this true? If so, how could this seemingly benign information be used to harm Chrysler?

[drews77]

The collision shop that I work at recently repaired a 06 Charger R/T that had rear suspension damage. The OE replacement compresion link that we received looked identical but was steel instead of aluminum. I'm assuming the tension and camber links have been updated also. Has there been a problem with these links wearing out or breaking? Do the SRT8 LX cars have this same problem. I inspect my links and they look identical to the R/T (except, from what I hear, the bushings are Heavy Duty). Should SRT8 owner expect any problems. These links are very expense and cost around $1025 list per side (parts only) + 5.5 hours overhaul per side.

Thank you for any information you are able to provide.

-Patrick

[James Butler]

I am impressed with all of the new MOPAR Hemi cars, and the proud owner of a Magnum, but cost seems to be a limiting factor for a lot of folks.

Have you considered a "Road Runner like" Challenger or Charger; big motor but no power windows, power seats, sun roof or other frills, to cut cost and weight?

It would seem in this economy that a car enthusiast, the market the Challenger is aimed at, would jump at a bare bones go fast car like the Challenger.

Just wondering.
Jim

[JamesG]

Just bought my 09 Super Bee... love it.

This may have been asked in a previous session that I have missed, but do you have an opinion on the catch cans that so many of us are running on our cars to catch the oil vapors from the crankcase ventilation before they go to the throttle body?

[CRF450RR]

Would it help lower my 1/4 mile ET's if I install a torque converter in my 07 R/T????
The torque starts coming on around 2800 to 3000 rpms so, I'm thinking of getting a 2800 rpm stall.

Thanks for your time and help...

[JeDiHemi]

thank u for being here period.

1) are srt models currently in production from only past orders from a certain cut off date or has production halted for new orders?
2) what is the largest liter engine you have tested thus far in an lx that may or may not have made it to production?

thanks in advance... an srt will be my next purchase. please take this back to your superiors: like shelby puts super snake packages on their mustang gt500 cobras, an upgrade package would be well accepted on an srt model where we would ship it back to the factory and have it added...

[bigdan1]

first i wish to thank you, to give us some time .....apreciated

1) is the SRT8 6.1L camshaft installed retarded ? there is so many arguments about this on the forum ...

2) if possible would you know the compression ratio created by installing SRT8 6.1L heads on a 5.7L
thanks
Dan

[Fast56k]

Why does the SRT Challenger platform have much more significant wheel hop as compared to the SRT LX platform? I own one of each.

C.

[FleshWound]

Hi, I'd like to thank you all for spending some of your valuable time with us, (your presence and enthusiasm is deeply appreciated)



I'm just wondering if there is any testing databases that you can share with us?
anything at all, if the limits in any one field have been reached, we'd like to know, so other fields
can be pursued.

Thanks for your time.
Cheers

[Einsteiniac]

My question is more related to customer service. I purchased my Caliber SRT-4 back in the last day of May. I got a killer deal on it since the dealership that owned it was being forced out. Anyway took delivery and drove it on the freeway the first time and it was shaking like crazy. Took to a different dealer that just happened to be close to where I was. They said it had flat spots and to drive like 800 miles and they should work out. I drove it about 1500 miles no difference. After this time the dealer I bought the car from is now out of business so now I have no recourse with them. I took to another dealer by my house they confirmed the flat spots and said it was because of dealer neglect letting the air drain and not moving the car on the lot enough. Long story short they balanced the tires but the vibration is there still, enough where it feels unsafe to drive over 70. So I now have an open reference number with Chrysler customer service to see if they would take care of the tires under warranty but the rep I spoke with didn't instill much hope that they would take care of this. I know how this is going to work out they are going to say take it up with the dealer who has now filed for bankruptcy. I won't see a damn thing. I don't know I just feel a bit shafted I currently own and operate 3 SRT vehicles 1 05 SRT4 1 08 SRT4 and 1 05 SRT8 300. I also have a 97 ACR Neon and have owned in the past an 04 SRT4 before it was wrecked. I am obviously an extremely loyal customer. Is there anything you guys can suggest I do to help get this pushed through? 18819811 is my reference number if it helps at all and you may email me at mark at macmatters.com if you don't want to post to the public forum.

BTW this is my company car so I got her wrapped the following has links if you guys care to see them.

http://gallery.me.com/macmatters#100046

[Hemissary]

Knock Sensors - Fidelity versus Accuracy;

Given the torque specification accuracy requirements, varying specifications of the knock-sensing device itself from batch to batch (tolerances - manufacturing/operational envelope), it appears similar vehicles operating under similar conditions/circumstances can consistently demonstrate significant differences in ST knock retard values.

When these devices were swapped from a vehicle which demonstrated excessive ST knock to another with significantly less, the anomaly followed the knock sensors (and vice-versa).

How critical is the torque spec, and your collective experiences/insight regarding these devices on the 5.7/6.1 line-up. Thanks!

[Super T]

As the others have said, thank you for taking the time out to stop by our little corner of the internet and answer some of our questions - That really says a lot about how you view your clients!!!!

My question is this: I know that a lot of the decisions made by "Daimler" were not necessarily popular with the rest of "Chrysler" while they were running the show. Now that their reign of terror has passed, what are the chances that the iron curtain will fall from around the car's coding? Specifically, now that the PCM has been cracked and is (sort of) widely understood, we're still left with no great solution for the TCM. We now have the Mustang and the Camaro up and running - the American Muscle wars have indeed been rekindled. In order for the Challenger to be a competitor - and keep the egg from Dodge's face - I should think that some kind of trans tuning HAS TO become a possibility. Any chance of finally seeing cooperation from the factory on tuning these cars?

[slowdown07]

Hello. Thank you for taking time to answer our questions.

What can I do to my car (300c srt8) performance wise, to keep from voiding my warranty?
What are the top three mods I can do to improve on power?

Again, Thank you.

[AlbertaTurboSrt8]

Okay two quick questions.
I own a 07 charger srt-8 with intake/diablo chip and a 180thermostat along with a block mounted oil cooler, ~410whp.
I had cut the catalytic converter (suit case) and the muffler restrictors, so it's basically straight piped. Those cutouts were replaced with the right sized pipe to cover the cut.

Will this cause a major loss of back pressure? I haven't throw engine codes, also will it cause a loss of power. What else does it do that is harmful to the engine?

Also what do you guys think about using Motul racing engine oil. Will I see a decent gain?

Regards.

[Hemissary]

It is a significant plus IMO that the marriage between Daimler and Chrysler benefited the LX platform specifically; we understand that the (5.5/6.1) LX platforms share a similar drivetrain (from the transmission back) as the Mercedes E55 series.

What percentage of the LX platform's electronics (both s/w & h/w) was transplanted/tweaked from Daimler Benz? Thanks!

[formerice]

**Future Product Questions removed** -Robert

And will someone go pee in the person's coffee, that canceled the Magnum! PT Cruiser still lives, Magnum is dead.:boohoo:

[MattRobertson]

It has been speculated that the air temperature sensor in the intake can be affected by the surrounding intake material that its anchored in. Is the sensor so sensitive to temp changes from this direction/source?
If I compare the SRT intake to the RT version, I see the RT unit sits inside that airhole that leads down low, while the SRT unit sits on top of it and there's a gap thanks to that little rubber bumper. Also the SRT box is hogged out in front. Assumedly this was all done to increase airflow capacity. What if anything did you lose by doing this, with respect to air charge temperature? And if you did lose something, was the loss meaningful to performance?

[MattRobertson]

If you look at my signature pic (previous post) you can see what I do most often in my Magnum. On Laguna Seca a G-meter measured maximum lateral g's at momentary peaks as high as 1.25 both left and right (top of the Corkscrew) and maximum braking g's at 1.10 (dropping down into Turn 2). In terms of sustained values I'm over 1 g more than I'm under it it seems. I'm running Hoosier R6 rubber to get these kinds of numbers.

Given that kind of abuse, what should I look to in terms of stress failures? Recognizing that this is tough on all of the car, if it were you what would you be checking before every track day?

[MOL SRT-8]

was there a design change in the piston for the 2009 model year? we know there is a definite weak point when run in a boosted application on the 2006-2008 motors but there are guy running more boost on some 2009 challengers.

[BuilderBill]

Hey Gents AND LADIES,
Great meeting you at the LX and Beyond.
It means a lot talking with you face to face.:thumbs_u:
Thanks for answering all my crazy questions in Ohio.

See you all in Charlotte at zMAX in May 2010!
Very Sincerely,
BuilderBill

[PickardvilleSRT8]

I would like to thank those involved for their time, it is much appreciated.

This is a curiousity thing that I have not seen any definitive answer for as of yet. Why is the copper content so high in Hemi engines when the oil is analyzed? My car as an example had a level considered critical( 280 ppm) at the 6000 mile mark. This apparently is not uncommon for the few of us that get analysis done to find. It is not my bearings as there is no tin or lead present in the oil, just high levels of copper. Not to mention the car holds 29-30 psi hot idle oil pressure. My car has no external oil cooler so what is the oil reacting with to create the copper? It apparently calms down over time so I assume it is a chemical reaction. I have yet to have my 9000 mile oil change analyzed but will do so soon.

For reference sake a family members 5.7 Hemi truck also had a higher than normal copper PPM at 30000 miles. So this is not isolated to the 6.1 or the SRT's.

[brandar75]

Thanks, first of all!
Catch cans are a VERY popular after market item for the 5.7 and 6.1 Hemis. Is there any reason why these should/ should not be used?

[Magnum Power]

Thank you for coming to LX Forums and allowing us to ask questions. I have enjoyed my LX everyday I get to drive it.

I would like to know if any more thought has been put into the suspention bushings or the suspention in general? Many of us have had bushings or suspention parts replaced or gone to after market parts to try to extend the lifetime of these parts.

[Wellsy]

A question on WOT. At freeway speeds 110kph / 70mph, when punching the throttle to pass or accelerate, I have noticed a hesitated, surging acceleration. When this happens I back off and continue at normal speeds. I mentioned this to another member with an 2007 Super Bee at a meet, and he recognized the same type of symptoms. To this day, we can't figure it out. Again, it is very intermittent, but when it does hook up normally, well, we all know the feeling when that happens.. When you take it to the dealer, it's like going to the doctor, they can't diagnose anything out of order. Hopefully there may be an answer.
Thank you for your time.

[InferAl]

I thought of this on the way home from the LX and beyond and was mad at myself for not asking out in the parking lot Sat night, BTW it was great to have you guys there

What if any is the difference between the R/T 5.7 fuel pump and the SRT 6.1 fuel pump.

Thanks

[caliente103]

*future product question removed by staff*

[DMAG]

OK, it's 6pm! Welcome to LXForums.com SRT Engineers! We truly appreciate you taking the time out to answer our questions and chat with us about these incredible cars you guys make.

Thank you!

[Hemi31]

Hi Guys......welcome to LX.....almost as much fun as sitting in the parking lot @ Ohio with a beer in your hand.....no hangover this time though;)

[SRTEngineers]

Can you please give me the production numbers for the Canadian Magnum SRT8s. I own a 2006 Inferno Red Magnum SRT8. I have heard that there was 666 Inferno Red Magnum SRT8's in 2006, does that include the Canadian ones?


Sorry we don't have that information available to us.....

[SRTEngineers]

Is the belly pan on the SRT8 for aerodynamics only or does it serve some other purpose? Mine blew out at the end of a drag strip because I removed the brake ducts in the front bumper for better cooling and presumably the pressure built up inside the engine compartment.

The SRT belly pan is a multi-function component, it houses the brake ducts, helps seal the front end to assist in engine cooling and manages the air flow going under the car. Removing it or any of its components will adversely affect the car performance.

[Speedy!]

When you guys are designing a performance oriented vehicle, can you rate in order the following hurdles you must overcome from the biggest to smallest?

A) Cost
B) Maintenance
C) Performance
D) Reliability

[SRTEngineers]

Thanks again for the chat in Ohio and welcome to our forums.

Where can we get all the parts to the LX SRT8 Brembo calipers , separately, i.e. pistons, pressure seals, mating grommets (front), etc.?
I did get some dust seals through Chrysler parts.

Thanks...Jonn

The calipers are not intended to be disassembled per Brembo's service policy...

[SRTEngineers]

What are the 09 axels rated at horsepower wise?


Axles aren't really rated for horsepower as much as they are for torque and even at that, like any metals, fatigue will create fractures at loads far lower than yeild limits if it sees the loads often enough. That said we designed the axle to handle peak torques as high as 3150 Nm (2323 ft lbs).

[devilrt]

I want to be able to run full diagnostic proceedures on the car. I was wondering if and where I can get software that will allow me full access to my computer can control of all engine and body modules. I want to be able to turn module on and off at will is there anything out there that will allow this??

[wbglider]

In relation to the above, many of us have corroded pistons in our brembo calipers and dealers that are unwilling to replace under warranty... any news of a TSB?

[SRTEngineers]

Why did my powersteering pump explode while
a)doing a donut
b)staying in the powerband while driving on a road course
on an 07 SRT8 magnum


Not sure that I can root cause that without having the part.... but is could have been a due to fluid starvation.

[SRTEngineers]

Why did my powersteering pump explode while
a)doing a donut
b)staying in the powerband while driving on a road course
on an 07 SRT8 magnum


Not sure that I can root cause that without having the part.... but it could have been a fluid starvation.

[SRTEngineers]

Hello,

I think we may have talked at the Mopar Nat's a few weeks ago!

Valve spring problems like you are experiencing are generally due to poor valvetrain dynamics and is most times the result of camshaft profiles that are too aggressive. Generally speaking, the conical valve spring design is limited in it's ability to control extreme valvetrain motion as effectively as conventional race spring design, but due to the packaging limitations in the head and the relatively short spring heights used in the current generation Hemi, spring options are severely limited as you have found.

In our development and testing of the Mopar Performance parts line of valvetrain parts, we found the Comp Cams 918 spring to be the best available spring for the Hemi application. It is my understanding that Comp may have had some recent issues with materials as a part of their revised spring design and finishing process that was implemented later in 2008. My conversations with the engineers at Comp suggest they have resolved this issue in later product. Given that you have broken a spring, I would recommend contacting Comp Cams engineering department to discuss the problem you had and return the set of springs to them for analysis and possible upgrade recommendations.

I had a Manley exhaust valvespring break when I was out at the LX and Beyond Nats a couple of weeks ago. It broke on my last run down the track. We (the Hemi community) have had problems with Comp Cams springs in the past and are now having problems with Manley springs. Does Mopar Performance have a spring that will work this cam? And if so, why is it better than the Comp or Manley?

http://i43.photobucket.com/albums/e361/DennisFlanagan/Magnum%20build/IMG_0194.jpg

[SRTEngineers]

Production numbers of the 2006 Crossfire SRT-6 (dealer order only) before it was phased out, not the 05... Seems to be around 50 units in existence and most were exported, give or take ~25?


Sorry we don't have that information available to us....

[Wetcoast]

Axles aren't really rated for horsepower as much as they are for torque and even at that, like any metals, fatigue will create fractures at loads far lower than yeild limits if it sees the loads often enough. That said we designed the axle to handle peak torques as high as 3150 Nm (2323 ft lbs).

This is interesting. What is the peak torque value for the 05-08 SRT 215mm axles?

[SRTEngineers]

1) What are the specific changes made to the Mopar TCM vs. stock ???

2) What are the commercially available software packages that allow the reprogramming of the Siemens TCM's that our cars use...and why have attempts by some programmers seemed to have been overwritten after some time ???

To quote the I-sheet:

"The MOPAR Transmission Controller Upgrade has an optimized shift schedule to take full advantage of the MOPAR 5.7L Hemi Performance Camshaft and Performance Torque Converter. The performance tuned AutoStick® calibration with hold in-gear feature will prevent the transmission from up-shifting at red-line RPM in AutoStick® mode allowing for sportier driving."

Our cal was developed intrenally by the same people who work on the production controllers which gives them a leg-up on what's going on in the aftermarket.

[srt8_hmi]

Why is there no lifetime warranty on SRT models? Consumers pay a premium for the upgrades but don't receive the added piece of mind?

[SRTEngineers]

I have a question in regards to the Stock kicker audio system. Is the Stock amp the same as teh 77kick18 amp upgrade? Chryslers sales literature states that that stock kicker amp is 322 watts, and the 77kick18 is 368. Is there a difference?

Sorry, no Audio folks in the room tonight.

[SRTEngineers]

Brembo Brake Dust.

While attending an SRT Experience last year, one of the instructors mentioned they used a spray or compound on the rims to eliminate the build-up of brake dust on the rims. I never got a chance to re-connect with that instructor that day, do you know what they are using on the Experience cars for the brake dust problem?

Thanks.

Don

Not sure what the TE instructors were referring to, but we recommend using the Mopar wheel cleaner.

[Flanman]

Yes, we did talk at the Nats. It was great meeting all of you guys and having the question ans answer session Saturday night out there. It was a Manley spring that broke for me, and my engine builder has been in contact with them about the issue (I am not his only Manley spring victim). The Hemi community has stayed away from the 918's because of many breakage issues early on. It is good to hear that Comp has apparently resolved the issue. Thanks for the answer.


Hello,

I think we may have talked at the Mopar Nat's a few weeks ago!

Valve spring problems like you are experiencing are generally due to poor valvetrain dynamics and is most times the result of camshaft profiles that are too aggressive. Generally speaking, the conical valve spring design is limited in it's ability to control extreme valvetrain motion as effectively as conventional race spring design, but due to the packaging limitations in the head and the relatively short spring heights used in the current generation Hemi, spring options are severely limited as you have found.

In our development and testing of the Mopar Performance parts line of valvetrain parts, we found the Comp Cams 918 spring to be the best available spring for the Hemi application. It is my understanding that Comp may have had some recent issues with materials as a part of their revised spring design and finishing process that was implemented later in 2008. My conversations with the engineers at Comp suggest they have resolved this issue in later product. Given that you have broken a spring, I would recommend contacting Comp Cams engineering department to discuss the problem you had and return the set of springs to them for analysis and possible upgrade recommendations.

[SRTEngineers]

Please explain the oil specification of Mobil1 0W40 --

seems that 5W40 or 10W40 covers the same ground for most ambient temperature applications.

part 2: will SRT authorize or waive the 0W40 to allow use of Synthetic 10W40 or 5W40? (especially in Texas where the low ambient is 25 degrees F)

my car: 07 MSRT8 x 2

You are correct the only significance in the low end of the oil weight 0W vs 5W vs 10W is the improved performance in the very low temperatures. We certify for the entire nation so we pick the best product for use for everyone. Mobil has told us the 0W40 has the most stable additive package of the multivis synthetic oil group. In truth you can use any of the Mobil synthetic oils you have mentioned without concern. Dodge will not quibble with any of these selections especially for 25deg F low temps.
KC

[SRTEngineers]

How many SRT8's have been manufactured in 2007; & what is the overall total produced?

Thank you.

sorry, we don't have that information

[SRTEngineers]

Thank you to all the SRT engineers for taking the time to answer all of our questions. I have truly enjoy my charger SRT8 from day one. Question is, why does this vehicle have so much hesitation when you step on the gas pedal? seems like it winds up and then shoots out. It feels like it builds up power, then realeses it.

Your feeling what the government has forced us to do for emissions regulations. We don't like it either! Its related to the pedal/throttle relationship and combustion stability.

[eliminator219]

Just one simple question. Is there anyway that I can special order a WHITE SRT? They make them in White for the RT and the SE. We spent the larger amount of money for our cars and can't get the color that the cheaper cars have. WHY? Thank You!

[77 Daytona]

Quick question!! There was some talk of we were doing more harm than good by changing to a 180 therm and controling our fans with Diablo tuners???

By the way it was a nice burnout with the Viper truck at the nats.

[05nvrL8]

Your feeling what the government has forced us to do for emissions regulations. We don't like it either! Its related to the pedal/throttle relationship and combustion stability.

Is there anything to do, maybe say "off-road" ;) ,that would help with this "issue"?

[SRTEngineers]

Fortunately, and somewhat counter-intuitively, moderate forced induction pressure levels are relatively easy on rods PROVIDED there is absolutely no evidence of pre-ignition or knock. However, the production rods were never designed for boosted applications, there really is no safe answer to this question. Having said that, the 6.1L rods are fairly robust in naturally aspirated applications. However, I would say the safe answer is to suggest that in any boosted engine, all internal components should be considered for upgrade much like your decision to upgrade pistons.

First off, THANK YOU for doing this chat here on lxforums. I realize that this is outside of the original design specs of the 6.1, but we have quite a few cars running boost around here. Several have had piston failures at the top ring land. These failures appear to be due to high heat causing the ring to go solid and arch up into the land.

We now have forged pistons with a thicker top ring land available to replace the stock piston. So how much boost do you think the stock rods can handle? I don't think we've seen an OEM connecting rod break without a piston failure first.

[goldsmi]

Please let the bean counters know that we all would gladly pay an extra couple of $$ at purchase time if the vehicles were equipped with lug nuts that don't self-destruct after the second removal.

[08 challenger]

A couple of times when I used the autostick and then go back to using drive that when slowing down and then letting my car coast at about 30km it takes a long time for the rpm to come down.But while it is taking time to gear down if I upshift and then go back to drive again the rpms go down like it should.Is the computer relearning?Is this OK?
Thanks for your time.
Robert

[1fastsedan]

Fortunately, and somewhat counter-intuitively, moderate forced induction pressure levels are relatively easy on rods PROVIDED there is absolutely no evidence of pre-ignition or knock. However, the production rods were never designed for boosted applications, there really is no safe answer to this question. Having said that, the 6.1L rods are fairly robust in naturally aspirated applications. However, I would say the safe answer is to suggest that in any boosted engine, all internal components should be considered for upgrade much like your decision to upgrade pistons.
Thanks for the answer. I did end up getting forged rods too. There has been some debate about the strength of the OEM connecting rods. I've seen one bent around a chunk of piston and it didn't break. They impressed me.

[SRTEngineers]

I have a question in regards to the Stock kicker audio system. Is the Stock amp the same as teh 77kick18 amp upgrade? Chryslers sales literature states that that stock kicker amp is 322 watts, and the 77kick18 is 368. Is there a difference?

Yes, 46!

Seriously, the stock system is driving 7 channels at 46 Watts, whereas the Mopar system is capable of driving 8 channels at 46 Watts. Hence the difference in ratings.

[devilrt]

I want to be able to run full diagnostic proceedures on the car. I was wondering if and where I can get software that will allow me full access to my computer can control of all engine and body modules. I want to be able to turn module on and off at will is there anything out there that will allow this??
http://www.lxforums.com/board/images/misc/progress.gif

[jeffisevil]

As for the Caliber SRT4, are Stage 1 Turbo upgrades still available for purchase? Any chance of Turbo Toys for the Caliber too?

[SRTEngineers]

Actually, I am almost positive the second ring gap specification printed in the manual is incorrect. The actual gap is quite a bit wider than you indicated and much closer to what you have observed (though I can't put my hands on the spec right away, I think it's closer to .018 - .032" but don't quote me). Since the introduction of the 6.1L engine into production, the ring design and material has remained unchanged.

The factory manual lists the ring gap specification for the 6.1 as: Top compression ring .0118 - .0157 and the second .0137 - .0236. I recently inspected a motor with 30K miles on it. The top ring was close to spec and measured .012 - .015 but the second ring averaged .036 - .039. Is it possible the second ring was gapped at the factory wider than spec or is this simply wear and the type of material used. On the 09 6.1’s, have the ring gaps or ring material been changed and if so, can you provide the specification?.

[Bonez]

Thanks for being here for us!

I have heard of several '09 Challenger SRT's using excessive amounts of oil early on after taking delivery.(less than 3000 miles) Mine, for example, used about 1 1/2 quarts for the first 1100 miles. Is this something that will correct itself with a few more miles on the clock? And, also several owners have expressed concern about a blue puff of smoke from the exhaust upon startup of an already warmed up engine. Is this a problem, could you explain both answers please?

Thank you again!

[The_Main_Event]

Why is there no lifetime warranty on SRT models? Consumers pay a premium for the upgrades but don't receive the added piece of mind?


I am going to have to agree we should have some sort of longer warranty on SRT models compared to the base models. We as SRT owners pay more to have the SRT experience and in my opinion we should have a longer warranty. I am a car dealer in South FL and I do know why we as SRT owners only have a 3 year or 36,000 miles warranty. Only reason I can come up with is the price for parts. It must cost much more for our cars to be fixed (mechanical) wise. I do understand we have an option to buy an extended warranty, but in my opinion we shouldn't have to purchase it if we pay close to 35-40k or more on a SRT vehicle. Is their any other reason why we dont have a longer term on our warranty other than the one I came up with? What other SRT vehicles are in the works? Can you disclose any? Has the new Chevy Camaro affected the sales of SRT models? Thanks

[MOL SRT-8]

Fortunately, and somewhat counter-intuitively, moderate forced induction pressure levels are relatively easy on rods PROVIDED there is absolutely no evidence of pre-ignition or knock. However, the production rods were never designed for boosted applications, there really is no safe answer to this question. Having said that, the 6.1L rods are fairly robust in naturally aspirated applications. However, I would say the safe answer is to suggest that in any boosted engine, all internal components should be considered for upgrade much like your decision to upgrade pistons.

aman to the rods being tough. i saw one that bent 30 degrees and did not brake.

[SRTEngineers]

Initially our 6.1L were designed to use 0W40 Mobil 1, its on the oil cap and in the SRT's car manual. The bankruptcy brought about a falling out with Mobil 1, now all the dealerships are using 5W40 in the SRT 6.1L motor. From an engineering perspective is this change OK for the 6.1L? Why the change in viscosity? Thank you.

Yes the change in viscosity from the 0W to the 5W will only show up in very low ambiant conditions (-20deg and lower). The closest synthetic oil from Penzoil/Quaker/Shell available for all of our sales areas required this small change in low end viscosity. In truth any quality synthetic oil with 0-10W40 multivis oil will be fine for your 6.1L. If you are running it hard or in very hot climes use the 10W40 (or even 15W50 on the track). If running in very cold climes move it down 0 or 5W40.
KC

[rubbel]

Would .008" measured crankshaft end play be out of specifications and would this cause additional oil useage? '09 6.1L SRT8 challenger

[MoPOWeR-349]

Any chance the intake manifold for the 6.1 will be made out of plastic so we SRT guys can take advatage of lower weight and thermal isolation of the intake air charge.

Thanks again for coming to the forum for a Q&A night!

[devilrt]

What is your opinion on running ZMAX in the car ???????

[Mosie]

Thanks again for coming to the LXForums and sharing a bit of your knowledge and expertise!
:not_worth

Not a technical/drive train question, but one Magnum/300 owners would like to know the answer to.

Where there aerodynamic features for the SRT's to make them less like a "flying brick" once on the freeway? Maybe things that got left on the cutting room floor, as previously mentioned, that the budget did not allow for?
I'm personally interested with the simple rear spoiler design of the Magnums. Even SUV's have spoilers that keep the rear hatch cleaner and help with drag coefficient...

Thanks again! :thumbs_u:

[robert_ayala]

Question on 2010 models are not allowed... this time.
REMOVED BY STAFF

[devilrt]

**Dup Post deleted** -Robert

[SRTEngineers]

many srt8 owners use the diablo tuners to get max performance, my question is:1) will use of this tuner void my warranty? i'd like to buy one but i'm afraid of screwing up my pcm and my warranty. 2) if they work so well , why doesn't chrysler just tune the pcm's for max performance? (like the diablo)

The use of any aftermarket "tuner" will void your warranty....

We tune our vehicles to meet our long term durability targets while maximizing the performance.

[SRTEngineers]

many srt8 owners use the diablo tuners to get max performance, my question is:1) will use of this tuner void my warranty? i'd like to buy one but i'm afraid of screwing up my pcm and my warranty. 2) if they work so well , why doesn't chrysler just tune the pcm's for max performance? (like the diablo)

The use of any aftermarket "tuner" will void your warranty....

We tune our vehicles to meet our long term durability targets while maximizing the performance.

[MoPOWeR-349]

Laslty, I'd like to know a little more regarding the number one piston and why it tends to break the ring landing more often than any other piston--is this do to poor circulation throughout the block and excessive heat just at this location.

I'd like to put an underdrive pulley on, but feel if poor circulation is occuring at this location this may accelate wear and possible raise tempratures even more. Your thoughts...

[SRTEngineers]

Seeing that Chrysler isn't using Mobil 1 in the 6.1 Challengers, what weight and manufacture should we use. Just had the oil changed in my 08 Challenger at the dealer, and the receipt did not specify the weight or manufacture.


For our products direct from the factory we are filling our SRT engines with Penzoil 5W40 synthetic. Any quality synthetic wide range multivis can be used for continued service. Certainly the recomendations would include Mobil 1, Penzoil platinum, Quaker Qpower, or Shell Helix as quality synthetic oils.
KC

[SRTEngineers]

We appreciate your involvement here on the forums, thank you!

SRT engineers have put forth various reasons as to why this cross brace exists in this location:

http://i441.photobucket.com/albums/qq139/LetItAllPass/IMG_0550.jpg

They include:

- to support the exhaust during factory assembly
- general body stiffness enhancement
- control support during front/rear impacts (serious crash event)

Can we get a definitive answer(s)? Thanks!


Option 1: No
Option 2 & 3: Most logical

[xevilpetex]

Not sure that I can root cause that without having the part.... but it could have been a fluid starvation.

The fluid overheated and the front seal blew out. There were a number of LX's at the track that day experiencing power steering issues. Mine being the most severe.

The car was spending the majority of its time between 4k and 6k rpm and after 2 30 minute stints with an hour in between each the powersteering gave out. After letting everything cool down for 2 hours i attempted to drive again and the pump completely failed after 1 lap (braking into a hard right hand turn after the 130mph straight) The power steering fluid was at the correct level at the start of the day and prior to the final stint. I have since added a large power steering cooler (along with oil and trans coolers) and I would like to know if there is anything else i should do to increase the pumps longevity.

[SRTEngineers]

Question on 2010 models are not allowed... this time.
REMOVED BY STAFF

Sorry, can't talk about future products...

[robert_ayala]

**AGAIN... Future product question Removed** - Mosie

[SRTEngineers]

Thanks again for attending LX&Beyond, and for the chat session Saturday night. Anyway, id like to carry over some questions that were made there about the 226 getrag rear differential.
Clutches, could we get a repair clutch kit number produced, or shim kits to make the packs tighter?
Rear drive shaft. Currently its required to buy the entire drive shaft. Can we get a rear section only number supplied?

We had a great time a LX&Beyond and look forward to doing more event like it in the future. As for the clutch pack parts... Have you had an issue with the LSD clutch pack? If so, is it damaged or are you getting one wheel peel? We have discussed additional bias ratio options but haven't seen much need. If there is a need, please let us know more. BTW, additional bias ratio will negatively affect turn-in response.

[bigdan1]

**Dup post deleted** -Robert

[SRTEngineers]

Are all SRT8 intake manifolds interchangeable between models and year of manufacturer. For example, with the manifold from a 2009 Challenger SRT8 fit on a 2007 Charger SRT8? There appears to be some confusion regarding this interchangeability.
Thanks for coming to answer these and other questions. You all manufactured a tremendous ride so I got two of them as described previously in the example!

Same part.....

[Robert@SHR]

Hey guys, it was nice talking with ya'll in Ohio!

We have been building a lot of boosted cars lately. What are your thoughts on part throttle boost?

Check out the latest build!

http://www.youtube.com/watch?v=DCA0SZubPp8

[SRTEngineers]

Hey Gents AND LADIES,
Great meeting you at the LX and Beyond.
It means a lot talking with you face to face.:thumbs_u:
Thanks for answering all my crazy questions in Ohio.

See you all in Charlotte at zMAX in May 2010!
Very Sincerely,
BuilderBill


Hey Bill! Thanks for the shout!
We all had a great time at Nationals too.

[SRTEngineers]

I have been wondering what is next for the Viper V-10 Motor. Heard that production of the Viper has stopped and with all the R&I money spent in the new 8.4L motor will there be any other uses? What about the V-10 cahllenger concept? Any further improvements or progress on this? And fianlly what were the production numbers on the 2006 Dodge Ram SRT-10 Reg Cab Trucks? Can't find naything on this.

- Well the Viper is alive and well... Conner was the first plant to restart after the 3 month shutdown.

- Can't talk about future products.....

- Sorry we don't have that information available to us.

[SRTEngineers]

What areas on the SRT exhaust need the most attention to increase the performance of the total system, and what modifications specifically should be done to those areas?
Resonators, suitecase, cats, x-pipe, pipe dia. etc??? Brake down for each, specifics!!!!

Thanks BTW you created a great line of cars, keep up the great work.....

The cats are the biggest cork.....

The suitcase and the rear resonators are both "straight thru" so there really isn't much there. The pipes get squeezed down going in and out of both the suitcase and the rears, I believe the rears go to 2.25". That's a small cork, but not much. X-pipe reduces backpressure by approx. 1" (Total system is about 10") leave it in. 2.75" pipe is plenty big.

Hope that helps

[budoboy]

Sorry if this has already been asked, just got home and wanted to get this question in before this is over:

With the Getrag 226 LSD rear end in the SRT8 models is there any kind of break-in required? I've heard of some members who retrofitted it into earlier models (as I did) who ran figure 8's and other stuff because they read about it somewhere.

Are they broken in at the factory? The one I ordered already had fluid in it which makes me think it already was broken in.

Some folks have noticed a whine from this rear end around 50 MPH. I think I just heard it on mine today. Is this typical with this LSD? Has there been any upgrades to this unit in the short time these LSD rear ends became available?

Oh yeah, you guys rock:rock::not_worth:not_worth:not_worth

Plus you are brave coming here. Lots of gear heads with difficult and complicated questions.

[SRTEngineers]

It has been suggested that the 09' SRT model year has significant changes to TCM code which detunes the level of performance compared to previous model years.

It also appears that the 06' (and earlier) platforms perform better than the 07' (and later) platforms in the same area (off the line - significant timing pulled immediately after tip-in/WOT). We are observing these parameter changes during datalogging...

Care to confirm/deny? Thanks!


As far as the 09 TCM code - there were no changes for the SRT8.

[MagnumRT05]

What is the difference (if any) between the Neon SRT4 3.0 bar MAP sensors and the Caliber SRT4 MAP sensors besides a $60 different price tag? Also, when can we expect the 3.0 bar MAPs to be available again for us running high boost apps? Thank you.

[SRTEngineers]

What areas on the SRT exhaust need the most attention to increase the performance of the total system, and what modifications specifically should be done to those areas?
Resonators, suitecase, cats, x-pipe, pipe dia. etc??? Brake down for each, specifics!!!!

Thanks BTW you created a great line of cars, keep up the great work.....

Sorry, we're not allowed to suggest any mods...

[Hemi31]

The cats are the biggest cork.....

The suitcase and the rear resonators are both "straight thru" so there really isn't much there. The pipes get squeezed down going in and out of both the suitcase and the rears, I believe the rears go to 2.25". That's a small cork, but not much. X-pipe reduces backpressure by approx. 1" (Total system is about 10") leave it in. 2.75" pipe is plenty big.

Hope that helpsIn your opinion is it worth removing the 2.25" bottleneck and replacing it with the 2.5" pipe?

[Rakshasa72]

I'm the proud owner of a 2008 MSRT-8. Given that this car was re-designed for the 2008 model year and, then promptly canceled (only a little over 250 where made I think). Where you frustrated to not see your new design get a chance to prove itself?

[SRTEngineers]

Thanks again for coming to the LXForums and sharing a bit of your knowledge and expertise!
:not_worth

Not a technical/drive train question, but one Magnum/300 owners would like to know the answer to.

Where there aerodynamic features for the SRT's to make them less like a "flying brick" once on the freeway? Maybe things that got left on the cutting room floor, as previously mentioned, that the budget did not allow for?
I'm personally interested with the simple rear spoiler design of the Magnums. Even SUV's have spoilers that keep the rear hatch cleaner and help with drag coefficient...

Thanks again! :thumbs_u:


There are often many trade-offs that are made when developing a vehicle. SRT vehicles are developed with performance in mind.

[SRTEngineers]

Thank you SRT Engineers for taking time to answer questions.

I have one problem with my SRT-4 Caliber and I have taken it to 4 dealers here in South Florida and all of them tell me there is nothing wrong. My husband even had one of the mechanics in the car when it happened. Here is what it does:

I am driving the car and maybe make a hard turn right or cross the rail road tracks I hear a loud "pop" when this happens. Its up on the right side of the car toward the front. This can't be normal. What do you think it is??

Thanks for any help.

Could be a couple things. There was a LCA bolt change, have you had this looked at? Also check the torque on the front suspension craddle bolts, there are 4 of them. I would put the torque at the max spec (163Nm). If the bolts are torque all the way up the crossmember can move and it does make a loud noise.

[evil_6.1]

When I replaced the stock exhaust on my 2006 SRT8 charger I noticed the X-pipe was not functional. Was this done to reduce costs, change the exhaust note or because having it open does not improve performance? Is there a specific year or model SRT8 that has a functional X-pipe? Thanks for your time.

[SRTEngineers]

Thanks for being here for us!

I have heard of several '09 Challenger SRT's using excessive amounts of oil early on after taking delivery.(less than 3000 miles) Mine, for example, used about 1 1/2 quarts for the first 1100 miles. Is this something that will correct itself with a few more miles on the clock? And, also several owners have expressed concern about a blue puff of smoke from the exhaust upon startup of an already warmed up engine. Is this a problem, could you explain both answers please?

Thank you again!

New engines take some time for the piston rings (sometimes seals as well) to break in. As ring tensions have reduced and bore finishes have improved (read smoother) the rings will take longer to seal to the mating surface. In some rare cases, if an engine is run very hard right out of the chute you will get some glazing between the bores and rings which will cause an even longer (or potentially never) break in period. Normal conditions will break in and seal up well within several thousand miles. Make a few hard runs with the car after break in will ususally accelerate the sealing. Some light smoke from the exhaust on start ups (usually cold or warm after sitting for a time) is not an issue. If the smoke is heavy or continuous during driving there may be a mechanical problem, take it to the dealer.
KC

[AlbertaTurboSrt8]

I had cut the catalytic converter (suit case) and the muffler restrictors, so it's basically straight piped.

Will this cause a major loss of back pressure? I haven't throw engine codes, also will it cause a loss of power. What else does it do that is harmful to the system/engine?

Also what do you guys think about using Motul racing engine oil. Will I see a decent gain?

[Quick]

Hope this isn't a repeat.

The modeled cat temps reported by the PCM (SRT8) seem to be high. Is the model pretty accurate?

Thanks for coming to LXForums!!

[srt8_hmi]

**Future Product Question deleted** -Robert

[SRTEngineers]

All 6.1L camshafts are installed in an advanced position in production. As for the 6.1 head / 5.7 block compression result, I have no idea.

first i wish to thank you, to give us some time .....apreciated

1) is the SRT8 6.1L camshaft installed retarded ? there is so many arguments about this on the forum ...

2) if possible would you know the compression ratio created by installing SRT8 6.1L heads on a 5.7L
thanks
Dan

[SRTEngineers]

Slight casting process change but otherwise it's the same part.

was there a design change in the piston for the 2009 model year? we know there is a definite weak point when run in a boosted application on the 2006-2008 motors but there are guy running more boost on some 2009 challengers.

[SRTEngineers]

Thanks again for the opportunity to chat. I have an '06 Dodge Charger SRT, built in October of '05. It has just over 44k miles on it. I don't go offroading. For the past year, I've observed what sounds like brake squeal (like when you have excess dust) when I accellerate. I know its not the brakes, as I'm not using them, but I'm worried that it may be a suspension issue as it only seems to happen under noticeable weight transfer (front to back). Is there a known issue?

Doesn't sound like anything we are aware of.... but you should have the dealership look into it... Do you have stock tires? tire rub? dust shield touching?

[SRTEngineers]

Hello. Thank you for taking time to answer our questions.

What can I do to my car (300c srt8) performance wise, to keep from voiding my warranty?
What are the top three mods I can do to improve on power?

Again, Thank you.


Can't go wrong with cold air, catback and suspension. Note, while these parts in and by themselves don't void your warranty "hard driving" or "racing" will !:blam:

[BigHemi06]

**Non SRT question removed** - Robert

[SRTEngineers]

My question is more related to customer service. I purchased my Caliber SRT-4 back in the last day of May. I got a killer deal on it since the dealership that owned it was being forced out. Anyway took delivery and drove it on the freeway the first time and it was shaking like crazy. Took to a different dealer that just happened to be close to where I was. They said it had flat spots and to drive like 800 miles and they should work out. I drove it about 1500 miles no difference. After this time the dealer I bought the car from is now out of business so now I have no recourse with them. I took to another dealer by my house they confirmed the flat spots and said it was because of dealer neglect letting the air drain and not moving the car on the lot enough. Long story short they balanced the tires but the vibration is there still, enough where it feels unsafe to drive over 70. So I now have an open reference number with Chrysler customer service to see if they would take care of the tires under warranty but the rep I spoke with didn't instill much hope that they would take care of this. I know how this is going to work out they are going to say take it up with the dealer who has now filed for bankruptcy. I won't see a damn thing. I don't know I just feel a bit shafted I currently own and operate 3 SRT vehicles 1 05 SRT4 1 08 SRT4 and 1 05 SRT8 300. I also have a 97 ACR Neon and have owned in the past an 04 SRT4 before it was wrecked. I am obviously an extremely loyal customer. Is there anything you guys can suggest I do to help get this pushed through? 18819811 is my reference number if it helps at all and you may email me at mark at macmatters.com if you don't want to post to the public forum.

BTW this is my company car so I got her wrapped the following has links if you guys care to see them.

http://gallery.me.com/macmatters#100046


Very sorry to hear this. Your going about doing the right thing with the customer service folk. I would keep pushing them hard and try not to take no for an answer.

Thanks for being a loyal customer.

[BlazeHemi]

What kinds of vehicles do the SRT Engineers drive for personal vehicles?

[jeffisevil]

As for the Caliber SRT4, are Stage 1 Turbo upgrades still available for purchase? Any chance of Turbo Toys for the Caliber too?

[SLICKHER1]

is the 5.7 and 6.1 fuel pump the same?

[Quick]

I have a 2006 SRT8 with a Mopar cat back and AFE CAI (don't think either of those would make much difference though).

For a number of calculators VE is an input.

1) What would be a good, single value to use for VE?

1a (bonus question) What is the frontal area on my '06 Magnum?

Thanks for coming to LXForums!!

[portatoredichrist]

The use of any aftermarket "tuner" will void your warranty....

We tune our vehicles to meet our long term durability targets while maximizing the performance.

What is the length of time /millage long term target?

My car: '06 MSRT w/ 34,000 miles

[SRTEngineers]

I thought of this on the way home from the LX and beyond and was mad at myself for not asking out in the parking lot Sat night, BTW it was great to have you guys there

What if any is the difference between the R/T 5.7 fuel pump and the SRT 6.1 fuel pump.

Thanks


One is higher flow....guess which one! Not sure the rating on the 5.7L pump, but the 6.1L (if memory serves me right) flows about 180l/hr.

[SRTEngineers]

When you guys are designing a performance oriented vehicle, can you rate in order the following hurdles you must overcome from the biggest to smallest?

A) Cost
B) Maintenance
C) Performance
D) Reliability


At SRT (understand the Gearhead bias now) we tend to view Performance and reliability with equally high importance. After that our cost guys start to chase us around the facility so we must submit. While the maintenance catagory is last here we do assemble and disassemble all our products personally to assure there are no unnecessarily difficult service procedures.
KC

[SRTEngineers]

Just one simple question. Is there anyway that I can special order a WHITE SRT? They make them in White for the RT and the SE. We spent the larger amount of money for our cars and can't get the color that the cheaper cars have. WHY? Thank You!

White is not currently one of our SRT colors and can not be special ordered....

[SRTEngineers]

As for the Caliber SRT4, are Stage 1 Turbo upgrades still available for purchase? Any chance of Turbo Toys for the Caliber too?



1. They are.

2. "Future product" but I wouldn't bet on it.

[Smoove06CSRT]

What do you guys think about Royal Purple 0w40?

[nhdave]

Many thanks for coming over guys (and girls :wink:)!! It was great having the chat in Ohio as well.

[1fastsedan]

...we do assemble and disassemble all our products personally to assure there are no unnecessarily difficult service procedures.
KC
It shows, and MANY members here applaud you for it. My SRT is, by far, the easiest to work on car that I've owned in the last 15 years.

[SRTEngineers]

When I replaced the stock exhaust on my 2006 SRT8 charger I noticed the X-pipe was not functional. Was this done to reduce costs, change the exhaust note or because having it open does not improve performance? Is there a specific year or model SRT8 that has a functional X-pipe? Thanks for your time.


300 SRT8's were open, Charger SRT8's were close. This was done to give the Charger a different exhaust note. Having it open was a VERY minor change on performance.

[Smoove06CSRT]

also, what is the deal with all teh coolant from my 2009 GC SRT blowing past the Radiator cap and all over everything.......

it is BONE STOCK. except for the replacement OEM Rad cap I bought and it does the same thing......

[SRTEngineers]

Why does the SRT Challenger platform have much more significant wheel hop as compared to the SRT LX platform? I own one of each.

C.


We have not seen a difference between the 2 if they are both autos.

[Smoove06CSRT]

I do work at a Supplier and I am at the CTC Tech Ctr all the time if you wanna take a look at it.....

[fnkychkn]

no question. just a big woo hoo shout out to you SRT folks for showing us some LX love. it's great to have you here.
as soon as you start building convertible SRT challengers, there'll be one in my garage :mrgreen:

ok, maybe one question; do you guys wear the team shirts for inspiration while answering these questions? :wink:

[SRTEngineers]

The fluid overheated and the front seal blew out. There were a number of LX's at the track that day experiencing power steering issues. Mine being the most severe.

The car was spending the majority of its time between 4k and 6k rpm and after 2 30 minute stints with an hour in between each the powersteering gave out. After letting everything cool down for 2 hours i attempted to drive again and the pump completely failed after 1 lap (braking into a hard right hand turn after the 130mph straight) The power steering fluid was at the correct level at the start of the day and prior to the final stint. I have since added a large power steering cooler (along with oil and trans coolers) and I would like to know if there is anything else i should do to increase the pumps longevity.

The larger cooler will help if you had and overheating issue.... but we have run these vehicles (stock) for 24 hours each (8 hours per day) without any powersteering issues.

[CVP33]

Two SRT8's so far, 101,000 miles and nary a peep mechanically out of these vehicles. A HUGE improvement over my two CTS-V's. Kudo's to you and your TEAM for designing/engineering a great vehicle that really stands up to tough driving.

Please disregard my sig' as my car is stock. :mrgreen:

[Cruisin1966]

As far as the 09 TCM code - there were no changes for the SRT8.

No changes from 08 to 09, or no changes from 06 through 09???? From first-hand experience in a controlled environment, I can tell you my car (09 SuperBee) with the same mods (as a couple 06's and an 08) gets out accelerated from a dead stop or rolling start all the way through at least third gear. Especially off launch, the timing drop is substantial causing a bogging down effect that is seen at every gear change afterward. Others with 09's have reported similar results.

On a different note, with cold air intake and cat back exhaust, what is the recommended spark plug gap on the SRT's? I've had some folks suggest that the plugs aren't necessarily gapped consistently and I would just like to have that "number" to check mine against.

[carter]

What year models of the SRT8 Charger have a functioning x-pipe installed? I have an 2007 that already had an aftermarket exhaust installed with the suitcase and two rear mufflers. The suitcase was two 3" inlet/outlet straight through design with no x-pipe function. When I contacted the manufacturer of the exhaust they said dyno numbers showed better results without the x-pipe. I did not believe this and cut out the suitcase and installed a 3" x-pipe. Car seems to run better and the fuel mileage has improved. Any comments on this I would greatly appreciate. Thanks.

[RobAGD]

Guys and Gals of the SRT team, Many many thanks for coming buy and answering our many questions.

We hope to see you guys back before too long for another fun filled evening Q&A Session.

Here is to seeing you all at another Big LXF Meet & Greet !

-Robert

[DMAG]

From the entire staff and membership of LXForums, we thank you from the bottom of our oil pumping hearts. We hope to have you back again really soon!

Enjoy!