SRT Engineers Roundtable: 08/05/09

**DMAG** · 07-31-2009, 10:11 AM

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** · 08-05-2009, 10:40 AM

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** · 08-05-2009, 11:02 AM

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** · 08-05-2009, 11:05 AM

What are the 09 axels rated at horsepower wise?

**CT-MSRT** · 08-05-2009, 11:14 AM

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** · 08-05-2009, 11:15 AM

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?

**MarylandSRT8** · 08-05-2009, 11:21 AM

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** · 08-05-2009, 11:22 AM

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** · 08-05-2009, 11:33 AM

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** · 08-05-2009, 11:35 AM

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** · 08-05-2009, 11:39 AM

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** · 08-05-2009, 11:39 AM

Will the challenger be offered in a sublime green color?

**1fastsedan** · 08-05-2009, 11:40 AM

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** · 08-05-2009, 11:44 AM

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 ???