I have an issue with my 2008 A6 as noted by other forum members - my car bogs while accelerating under certain conditions. My dealer checked the car and sent data to GM. We were told by GM that this is normal behavior and pointed to document ID: 2043008 - #PIP4112E. Even though the PI is listed for other GM models (Escalade, Tahoe, Impala, Monte Carlo, Yukon) I was told it also applies to my Corvette. Apparently the issue is inherent to "Torque Management" and GM uses this to "protect the drivetrain". It states "When coasting with a closed throttle and then aggressively applying the throttle. Examples of this maneuver include a rolling stop or a lane change maneuver. In this maneuver even though the accelerator is applied aggressively the throttle blade is opened slowly for up to 0.7 seconds to help in taking up driveline lash and minimize clunk...transmission downshifts may not be completed by the time the throttle is opened...zero torque may be commanded to allow the shift to occur. Both conditions are the result of torque management."

Several other posters have stated a tune will solve this problem by adjusting torque management - just need to decide when and how to do this. I don't have any professional tuners that I am aware of around my area and the Predator 3 is not available yet. The dealer also said a software update will probably eventually come - GM said there are other people complaining of the same issue. Just wanted to give an update to other forum members who may have the same issue.

 

Very interesting.

 

You know, this whole torque management thing really yanks my chain.
Here you have fine engineers who build a 400+ hp/ 400+ lb.ft. tq engine, and then they program the electronic engine controls to strangle the life out of it sometimes when you need it most.
Why not build a wimpy, underpowered engine so no torque management is needed to protect a crappy drivetrain?
OR, maybe just match the strength of the drivetrain to the power output?
I think GM needs to strangle whoever specified the crappy parts of the drivetrain that need so much protection. Jeez guys, cost cut somewhere else, or just raise the price enough to cover delivering a PROPERLY built drivetrain.
Hey, there's a novel idea for the C7!
Are you listening Tadge?
GM

 

Might put your warranty at risk as well.

 

True, true - even stated by the dealer during my visit. Not sure if I can handle the intrusion into performance though - we'll see - maybe I'll take my chances. I tend to feel as passionately about this as gmoller does.

 

This is not just a performance issue, this is a SAFETY issue. I have been at a slow roll and tried to make a left turn when this happened. Just about got broad sided because the car did not respond.

 

Sorry to hear.

A good reason to go with a manual tranny.

 

No need to get a manual. Have it tuned, remove TM, and it will respond as it should, just like a manual. Personally, I think the powertrain is strong enough. I think the real reason for TM is for safety. With TM removed, you've gotta be ready for the power when you give it the gas. GM doesn't want to get sued from people that can't drive a 400 hp animal and get into trouble.

Getting mine tuned was the best move I ever made. Although possible, the likelihood of losing your warranty are slim by having your car tuned. I have yet to hear of anyone being denied warranty work because of it. Do it and you'll wonder why you didn't have it done it earlier.

 

I agree with this 100 Percent...talk about a safety issue and lawsuit against the manufacturer!

 

I was going to add the same comment myself. That's how I first experienced the "torque management" issue. I was trying to safely make a lane change where timing was important, and the car failed to respond in a timely manner. The result was an unsafe maneuver where I was almost hit.

Also, I tend to agree with Dave O. that a tune is a good risk/benefit decision. I just need to find a good resource in my area - or a good tune module.

 

If this were true, then what did they do to the manual trans? There is the possibility, and a good one, that the drivetrain gets more shock/abuse with folks "popping" the clutch or some action that puts lots of shock on the system. An auto has a bit of built in shock absorption because it is oil pumping through the system. So I wonder what they were thinking when they built in this delay thing. AND, a tune may well fix it but the warranty, which has been addressed but ignored by many, will be an issue to strongly consider.

 

For whatever reason, both the service manager AND the bulletin both stated that my issue applies to the automatic. He specifically said it didn't apply to the manual, and the bulletin specifically said "gasoline engine with automatic". Maybe it has something to do with the transmission control module too - I don't know - I'm not knowledgeable in this area.

 

are u serious?? I would also like the full power of my engine, but unless you are competetively racing, I dont see a situation where u "would need it most"

 

That's kind of what my dealer said - he said most people wouldn't care/wouldn't notice this issue under normal driving conditions. But I notice it a lot and I care about it a lot.

 

That's because most Corvette owners with automatics drive their cars like Grandma's... Get a tune to dial out the intrusion and you'll be a lot happier..

 

Anyone know of a good tuner in the Los Angeles area, specifically the San Fernando valley. I would like to take care of this as well. Thanks.

 

Not SF specific, but you've got 3 tuners in SoCal as forum sponsors, and probably more that I don't know about.

 

any tuner can take care of this.

 

I just purchased an 08 corvette w/ automatic. I noticed the same thing. I haven't posted much on here and just started reading. Is there any tuner's out for the 08's, Also what is the easiest and quickest add for more Horsepower?

 

Dave O and I both have had our cars tuned and he likes the TM removed and I didnt. While I agree that the car is more responsive w/o TM it also IMHO made the shifts much more jerky and unrefined so I had it put back. I hope that HP tuners will allow more adjustment than just on/off in the future or other parameters that can be tweaked to remedy the situation. Interestingly, my tuner did this adjment without telling me. I finally had to call him and ask what was done because I dont like it so I am reporting this without any "placebo" effect.