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SRT Engineers Round Table: 10/29/2013

215K views 111 replies 42 participants last post by  BryGuy 
#1 ·
SRT Engineers Round Table Discussion

Tuesday, October 29th, 2013 5pm - 7pm ET

We are welcoming back the SRT Engineers to the LxForums!

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.
 
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#2 ·
Im not sure if you have heard but a Dodge Challenger twin turbo 3rd gen Hemi just went 7.85sec in 1/4!! I was wondering if you have any ideas to keep from lifting heads at 25 psi of boost and above?? Ls engines dont have a problem but we do.Some are working on it with head studs and O ring the block and heads and special gaskets.Any other places we should look at??
 
#19 ·
Big Dave - you're covering the right items: I would look at a high quality set of head studs. The unit loading will be high and you don't want to get into yield with the bolts. Watch the tensile / yield properties. I would go with the best material available for your application to keep the studs in the tensile range. You should use a good multi layer steel head gasket. The stock gasket is MLS and works well; however, your unique package may require aftermarket MLS gaskets. Especially if you need to adjust the compressed thickness to get a specified compression ratio. They are out there for boosted HEMI engines. O-rings are good as well but are harder to adapt. Good luck with your package!
 
G
#4 ·
Have you folks ever worked on a vehicle that was destined to be part of the SRT line and it never made it? Or have you envisioned other existing Chrysler vehicles begin SRT's, but they just didn't meet performance / business case?

Thanks!
 
#6 ·
There are many of us still looking for the ability to reprogram the TCM . For example, running a high stall converter (flashing to 5500rpm), The TCM logic thinks the car is spinning the tires on launch and force shifts the car into 2nd before it ever moves and then the converter will not lock up. Short of a stand alone controller, there is not much else to do other than keep the flash on the converter to under 4400 rpm. The Mopar TCM is a good start and for mildy modified vehicles is a solution. But for highly modified vehicles, it just does not go far enough. Any help in this area is appreciated.
 
#27 ·
There are many of us still looking for the ability to reprogram the TCM . For example, running a high stall converter (flashing to 5500rpm), The TCM logic thinks the car is spinning the tires on launch and force shifts the car into 2nd before it ever moves and then the converter will not lock up. Short of a stand alone controller, there is not much else to do other than keep the flash on the converter to under 4400 rpm. The Mopar TCM is a good start and for mildy modified vehicles is a solution. But for highly modified vehicles, it just does not go far enough. Any help in this area is appreciated.
We don't have anyone here from Mopar tonignt.
 
#9 ·
I've owned my 2009 Challenger SRT for 4 years and have put 25,000 miles on it. And it still puts a smile on my face every single time I drive it! Thank you for building a great looking, great performing, and comfortable car!
 
#10 ·
Have you guys ever considered sponsoring sportsman/x275 drag racers with parts discounts, awards, free t-shirts or some other form of support?

There are a few of us putting ridiculous money into our SRTs/drag paks and those cars are getting good press for Dodge/Chrysler in the process. It would be nice if you guys could find some way to assist/support/recognize/encourage us

Keep on rocking:rock:
 
#20 ·
Have you guys ever considered sponsoring sportsman/x275 drag racers with parts discounts, awards, free t-shirts or some other form of support?

There are a few of us putting ridiculous money into our SRTs/drag paks and those cars are getting good press for Dodge/Chrysler in the process. It would be nice if you guys could find some way to assist/support/recognize/encourage us

Keep on rocking:rock:
Thank you for your support of SRT/Chrysler products. We will look into your suggestion! We hope you have great success going forward with your races!
 
#11 · (Edited)
Magnum and the Road Course

As always thanks for taking the time to 'be' here, it truly is an impressive opportunity and shows your dedication and passion.

Last session a great question was asked, as a primer to my own here is a reminder;

Originally Posted by steves
Does the rear spoiler on my 08 Charger SRT-8 do anything besides block my view? Why isn't a spoiler delete option available?



It ABSOLUTELY works. The front and rear aero have been tuned to have the car feel the same at 150 mph as 80 mph. The rear end has 77 counts of downforce (with that spoiler and will have some serious lift without it). Dynamics wouldn't sign off on the high speed stability without it.​


With your response in mind, how does the Magnum SRT differ? Specifically, without the spoiler what is the downforce on our cars? I assume it also passed "speed stability", does the front rear balance (closer to 50/50) compensate perhaps?

If you have the time, a related question for someone that wants to seriously road track the Magnum. Without knowing the actual weight difference (I'll try to find and edit this asap) I'm looking at replacing the rear gate with a carbon fibre one.

This is obviously a big chunk of metal, do you anticipate a positive impact due to weight loss, or a negative one due to weight bias alteration?

EDIT - the weight savings is 50lbs, alone, not likely enough to consider. Any idea what the tipping point (literally LOL) might be? So to be clear, how many pounds of weight loss at ONE end, would have a negatively affect the handling the benefits from 49/51 bias?
 
#42 ·
As always thanks for taking the time to 'be' here, it truly is an impressive opportunity and shows your dedication and passion.

Last session a great question was asked, as a primer to my own here is a reminder;

Originally Posted by steves
Does the rear spoiler on my 08 Charger SRT-8 do anything besides block my view? Why isn't a spoiler delete option available?



It ABSOLUTELY works. The front and rear aero have been tuned to have the car feel the same at 150 mph as 80 mph. The rear end has 77 counts of downforce (with that spoiler and will have some serious lift without it). Dynamics wouldn't sign off on the high speed stability without it.​


With your response in mind, how does the Magnum SRT differ? Specifically, without the spoiler what is the downforce on our cars? I assume it also passed "speed stability", does the front rear balance (closer to 50/50) compensate perhaps?

If you have the time, a related question for someone that wants to seriously road track the Magnum. Without knowing the actual weight difference (I'll try to find and edit this asap) I'm looking at replacing the rear gate with a carbon fibre one.

This is obviously a big chunk of metal, do you anticipate a positive impact due to weight loss, or a negative one due to weight bias alteration?

EDIT - the weight savings is 50lbs, alone, not likely enough to consider. Any idea what the tipping point (literally LOL) might be? So to be clear, how many pounds of weight loss at ONE end, would have a negatively affect the handling the benefits from 49/51 bias?
I'll try posting this again....on the aero side, the Magnum actually is very close to neutral aero balance. It is does indeed pass the SRT high speed stability test. If it didn't we would have sold it like that.
 
#14 ·
Hello!

I've wanted a Viper since I was 10 years old. I make it a point to see a Viper every time I visit the U.S., which lately has been often. I've visited Woodhouse, Roanoke and Tomball too. I have a question about the headlights on the SRT Viper. Is it a design reason or legal reason why the daytime running lights are the bottom eye lid and not the top? If it was the top 'eye lid' the Viper would look angry rather than having a bruised eye whilst driving around.
 
#51 ·
Hello!

I've wanted a Viper since I was 10 years old. I make it a point to see a Viper every time I visit the U.S., which lately has been often. I've visited Woodhouse, Roanoke and Tomball too. I have a question about the headlights on the SRT Viper. Is it a design reason or legal reason why the daytime running lights are the bottom eye lid and not the top? If it was the top 'eye lid' the Viper would look angry rather than having a bruised eye whilst driving around.
The accent lights were designed as part of the styling direction of the vehicle.
 
#17 ·
Glad to see you folks back, welcome!

On the Magnum, is the dynamic sense module actually positioned at the center of gravity (X / Y / Z) for this platform?
 
#24 ·
Welcome and thanks for participating. I will not rehash my question from the first page of posts....
 
#38 ·
Some 6.4L engine components will swap with a comparable 5.7L. Valve covers, rocker shaft assemblies and pushrods will swap. Valves and springs are specific to each application as well as the valve seats and machining. The intake flange and bolt holes will allow a 6.4L intake on a 5.7L but your port openings are different. The 6.4L SRV valve in the intake will need a proper calibration as well.
 
#30 ·
I recently had both front knuckles and upper control arms ( redesigned) replaced on my 2007 SuperBee, What was the reason for the design change ??
Also I just recently installed the Mopar performance torque converter and states it stalls @ 2500 for a 5.7. Just curious what it stalls in my 6.1 ?
 
#40 ·
I recently had both front knuckles and upper control arms ( redesigned) replaced on my 2007 SuperBee, What was the reason for the design change ??
Also I just recently installed the Mopar performance torque converter and states it stalls @ 2500 for a 5.7. Just curious what it stalls in my 6.1 ?
The change to front caster was to improve the on center returnablity of the steering system. Sorry we don't have anyone here from Mopar performance here tonight.
 
#39 ·
For first gen SRT front ends, is there an indentically spec'd Mercedes/ AMG part that if found, would work and perhaps provide better longevity?

Sent from my HTC-Z710a using Tapatalk
The L platform vehicles have been greatly modified and there are no bolt-ons that we aware of. We would be interested to know what components are you looking to get better longetivity out of?
 
#41 ·
I have a 07 Police Charger Hemi and put SRT8 springs and shocks all around. The front subframe doesn't let the camber adjust bolts work since there isn't a batwing shaped hole in there but a single hole. Guessing this is for curb hitting. Anyway, do some upgraded factory upper or lower links (mentionied above) allow for camber adjustment, in front? I am just out of spec. for camber.
 
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