SRT Chat Session - SRTForums.Com 2/21/2007

[JayC]

The next SRT Engineering chat session is scheduled for Wednesday, February 21st.

The session will run from from 6pm to 8pm EST and will be at SRTForums
Join us!

[JMatt]

Quote: Originally Posted by TSB

TSB #: 21-020-06

Date: December 20, 2006

Subject: Flash: SRT8 - Delayed Or Rough 1-2 shift at Wide Open Throttle After Kickdown

Overview: This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software.

Models: ALL 2005-2006 SRT8 models of the 300C, Charger, Magnum and Grand Cherokee (North America and International Markets).

Symptom/Condition: The customer may experience a delayed 1-2 shift at wide open throttle after a kickdown. This is often referred to as a harsh or jerky shift which is the result of the engine reaching the maximum engine speed fuel cut off prior to the transmission shifting.

Note: This flash will also change the strategy for the ?Autostick? feature. This version will allow the transmission to upshift when the maximum engine speed is reached. The previous version would not allow the upshift unless the driver selected the next gear. Once the flash is performed, all of the changes are permanent and cannot be reversed.

Can you tell us what are the technical/logic changes to transmission behavior in the SRT-8's with this new TSB?

For example: ESP ON - will this now force a shift at 3200 if wheel spin is detected? Will it force a shift with ESP off if wheelspin is detected?
In Drive mode, what rpm will shifts happen under WOT? Is it different if in paddle mode (1-2-3-4-5)?

What changes cause the firmer-feeling shifts? Is torque management logic changed? If so, what changes?

Thank you for any insights you can provide.

[whiskey]

Is the 1-2 shift problem noted in the LX platform also linked with the shifting problems noted in the Jeep SRT8?

[Hemi31]

I noticed the center bearing on the driveshaft of the SRT8 LX's seems fairly light duty..Any idea what it's rated for before failure?

[MY HEMI]

Hi i would like to know why i have a terrible up shift problem with the new TCM flash is the car spins it will force the up shift at 3200 rpms evertime it goes into second and Bogs down...It never did this before i had the Flash...the autostick works fines i have no more shift hesitation but WOW the upshift is terrible when you break the tires loose in 1st gear the car is a sled now What can be done to fix this problem Please help........

[glhs837]

Hi Guys, two for you tonite

Scantools have shown less than %100 throttle position, even at WOT, is that real or an artifact of the data?

Why would I not see %100 calculated engine load until over 50 mph?

[glhs837]

And SRT-8 guys, we've now asked the 3200RPM question twice, give them a chance to answer.

[SRTengineers]

Quote: Originally Posted by Hemi31

I noticed the center bearing on the driveshaft of the SRT8 LX's seems fairly light duty..Any idea what it's rated for before failure?

Don't let the looks deceive you, we have done extensive testing and it will be fine......

[RobAGD]

Given that the Drifting Charger has the 392 in it and a 6 speed, what are you all using for an PCM on that motor ? The Crate Stand Alone or something else ? Can you give up any more details on how the engine is set up ?

Also wondering about racing parts for these new hemi engines. Is there an active program for producing Racing HD parts for the 5.7 / 6.1 based motors.

Thanks

-Robert

[SRTengineers]

Quote: Originally Posted by glhs837

And SRT-8 guys, we've now asked the 3200RPM question twice, give them a chance to answer.

Wait one guys. We just sent two guys out to do burn outs, we will be right back.

[glhs837]

Just a quick reminder, dont bother with future product questions, they cannnot answer them. And no, thats not for you Rob

[SRTengineers]

Quote: Originally Posted by RobAGD

Given that the Drifting Charger has the 392 in it and a 6 speed, what are you all using for an PCM on that motor ? The Crate Stand Alone or something else ? Can you give up any more details on how the engine is set up ?

Also wondering about racing parts for these new hemi engines. Is there an active program for producing Racing HD parts for the 5.7 / 6.1 based motors.

Thanks

-Robert

It has the new Mopar ECM. It's now shipping with the 392 crate engine and should be available as a stand alone shortly.

[grey lupus]

Reading up in the Factory 2006 LX Service Manual. I notice that the transmission Temperature is monitored. With a software change would it be possible to display this reading in the EVIC. Even if only in the "Engineering Mode". I mean we can monitor our left and right gas tanks and our auto headlamp light sensors.

Knowing what my tranny temp is when I am on a road race course would be a very nice addition. My car is a 2007 Magnum SRT8.

thanks

[MY HEMI]

OK it does it in any ESP mode off or on if it breaks the tires or spins it will force the upshift at like 3200 RPM's i have done it everytime i tired to take off Hard it does this since the new TCM.....Hope you have one SRT there that does this..some do some dont......

[SRTengineers]

Quote: Originally Posted by SRTengineers

Quote: Originally Posted by RobAGD

Given that the Drifting Charger has the 392 in it and a 6 speed, what are you all using for an PCM on that motor ? The Crate Stand Alone or something else ? Can you give up any more details on how the engine is set up ?

Also wondering about racing parts for these new hemi engines. Is there an active program for producing Racing HD parts for the 5.7 / 6.1 based motors.

Thanks

-Robert

It has the new Mopar ECM. It's now shipping with the 392 crate engine and should be available as a stand alone shortly.

As for thr racing parts, we're working on some stuff ......