I have noticed that the competitive mode is slower in throttle response, than leaving all of the electronics on. I have tried this on weekdays, weekends, day and night, slow and fast acceleration and every time I press that button twice, the response feels slower. Almost like I have to step on the throttle harder. Anybody else feels this?

I am trying to get used to using the competition mode for the track. Very odd.

One theory I have is that in case anyone hits that button on the console by accident, then there is less chance of losing it on throttling, sort of like toning it down a bit. To me though, competitive mode should be "competitive" driving and it just doesn't make sense to me.

Please feel free to chime in.

 

My car isn't exactly stock but I've never noticed a slower throttle response in comp mode. Comp mode should put TC off, AH on, but with greater tolerances for sliding sideways. IMO if you don't have a lot of track experience (and especially if the track has any walls or barriers you might hit) you're better-off to run with AH on...at until you gain experience.

As for your theory...someone would have to accidently hit the button repeatedly.

Again, I've never experienced any lack of throttle response in comp mode.

 

I have never noticed it before. Will give it a closer look this weekend but it would really surprise me that there would be a reduction in throttle response programmed into the competition setting. You do raise an interesting subject and I look forward to hearing what others have to say.

 

At the track i ran my slowest time with comp mode on....

 

At the track in comp or TC off or TC and AH off mine runs pretty much the same, nothing but normal variences in runs. Maybe your Torque Management is kicking in?

 

My car was soo much better after I switched everything off. In comp mode the car felt numb and a bit strange

This was a recent HPDE at VIR with R compound tires, the OEM tires have much less grip IMO so turn off everything with caution.

 

I have actually felt the same thing. I havn't tried it in Comp. Mode, but I have noticed it with TC off. Almost as if there isn't as much power. The car felt like this stock, and after two seperate sets of mods from two different tuners. I thought I was the only one but the car definately "feels" faster with everything on. Anyone have an explaination?

 

I have been driving mine for 14 months and I have noticed that in comp mode there's like an ever so slight lag in the engine responce. Like you I thought it was only my car doing this. I've done some searches but could not come up with an answer. I had heard there was a software up grade for a so called 'Stall and Hesitation' issue. But when I asked my dealer about it they could not come up with anything from GM about this. Maybe someone can find out more additional information and post it here. If this up grade exists this might be the fix for this issue.

 

Well I have had my car tuned from two different tuners and it's still there. Maybe it's something that none of the tuners are aware of or perhaps they don't have the abilities to correct it. I'm not sure. Any tuners out there have any idea what causes this and if there is a way to remove it? I'm going to make a seperate thread in the tech section and see if it gets more responses.

 

Good idea, let us know if anyone responds with an answer.

 

So it isn't just me. Thanks for everybody's feedback!

Now I am lost! I have about a dozen track days under my belt and usu run intermediate/high intermediate with my boxster. This saturday will be my first track day with the vette. Do I leave everything on, traction off or comp mode...HELP!

 

My car feels faster with everything off.

 

And how did you measure that?

 

I think it's tm. I had my car tuned with hp tuners after putting in headers. Need to take it in this Friday due to some rattling. Tuner tells me HP tuners has the tm delete function for the a6 in beta and my tuner is going to try it on my car. We'll see how it goes

Ted

 

I swear my '08 does this too, even tuned. What can be done?

 

Here's how it works......C5 and C6 Corvettes have an electronic throttle....On C5's there's a "throttle actuator controller' or "TAC MODULE" and C6's have the "TAC" module built into the ECM as one of the 3 internal processors.....

Due largely in part to the incredible performance of the lightning fast electronic throttle and the LSx series of engines incredible low end torque, the throttle has to be "curved" so that it isn't too responsive...#1) cause you could break parts and #2) cause you could EASILY spin the tires causing a VERY unsafe condition.

If you are driving a car with a CABLE throttle, the engine's response to the manual throttle cable or pedal is "linear" meaning that 5% throttle using your foot equals 5% throttle body opening and that 100% (floored) throttle is roughly equal to WOT or 100% throttle body opening. Hence they are about the same and more importantly, LINEAR.

Welcome to ELECTRONIC THROTTLE. When your foot is at 25% of the way into the throttle the engine's throttle blade is about 3.1% open! and at 50% throttle of foot travel, the engine's throttle is about 15.1% open!

The throttle is especially curved in the "below 50%" area and dosen't begin to get more "natural or linear" till above that point. Below 50% it is horrendous which causes unwanted side effects with respect to how GM tuned the cars originally (especially with automatics).

Unfortunately, most tuners can't or don't address this. ALL of my LS1/LS6 tunes have corrected this problem while maintaining a smooth throttle transition.

The problem is that with LS2/LS3/LS7 controllers, NOBODY can fix it.....yet. Until now, I'm the only guy that has ever even seen it for the LS2 family of controllers. I was testing it for a time for one of the companies, but while I got it working....it also caused problems and was unreliable.TRUST ME THOUGH.....I'M RIDING THEM TO CONTINUE WORKING ON IT.

As an example....The 06 and later ZO6 (due to it's huge power) has a MUCH MORE SUBDUED throttle than LS2's of the same year and for all controllers and vehicles (believe this or not!) When you decide to "GET ON IT" with the car in "competitive mode" (thinking that you're "getting on it") the throttle response curve is DISGUSTINGLY more conservative than in normal mode....HOW STUPID IS THAT????

Trust me, I'm the "GM ELECTRONIC THROTTLE SCIENTIST" and have spent zillions of hours messing with the system... While I'm still at it....it will be a while before it's working.....it if happens.

Realize the disaster and troubles if "just once" a GM electronic throttle stuck open....For this reason there are dozens of redundant safety checks which have delayed the release of this very powerful tuning feature for LS2 family controllers.

Also realize that some of what you are feeling is also "torque management" if it's not turned off...

I'm on your side and I'm still at it... WE NEED THIS FEATURE...but, PLEASE be patient.

This has been a public service announcement from:
CHUCK COW

 

I have yet to put it in competition mode.

 

I noticed the exact same thing in my 2006 MN6 and I thought it was just in my head, glad to know I'm not going crazy

 

Chuck: Nice explanation, thank you!

While I have you on topic... can you explain the LS3 e-gas torque management?

Recent Porsches with e-gas regulate torque to maintain constant speed for a given throttle pedal position. For instance, if one drives at 80MPH on a level road and all of a sudden the road goes uphill, the car will maintain the same speed as long as the right foot is steady - IOW no need to accelerate to maintain the same speed. I am not sure that the LS3 does that. Does it?

 

You're welcome.....

As to E-GAS...It's really a slick computer...but.......That's not something I'm aware of....So far, I haven't felt it or seen it in the computer anywhere.

Chuck CoW