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Old Sep 23, 2008 | 11:44 PM
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Default disabling traction control

i have a 2005 c6 corvette dedicated track car. it runs in the race group with NASA in Arizona and California.

I have to keep the car in "Performance Mode". If I put the car in "Traction Control Off" mode, traction control automatically re-engages and puts the car in a safety mode as soon as I start even moderate cornering.

Anybody know of a way to re-program the car?

Also, tire pressure sensor monitor issues. I have resorted to 4 Kart tires in the trunk with the tire pressure sensors mounted in the Kart tires. This allows me to switch my real tires without multiple efforts to reprogram. I still am having to reprogram the tire sensors multiple times during a track weekend? Any software solution for this problem?

Thanks much
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Old Sep 24, 2008 | 12:30 AM
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I dunno but maybe re-flashing the PCM could fix it? PM some of the tuners like Chuck COW.
Sorry!
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Old Sep 24, 2008 | 12:34 AM
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I don't get it. There's no reason for it to turn back on automatically. If I put mine in "competition" mode, or completely shut off traction and stability control, it will stay that way until I shut the car off.

The only thing I've heard of people sometimes having issues, is when they don't have all the tire pressure sensors. Sounds like it's related to that. There should be no need to reprogram the sensors multiple times. Are you sure they are functioning properly? If they are not getting taught correctly, then I could see them causing issues with the traction/stability control.
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Old Sep 24, 2008 | 12:41 AM
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sensors are working okay as it will stay in competition mode and when i scroll through air pressures are accurate.

is your car a 2005 or is a later year?

have you time trialed or raced the car?

thank you!
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Old Sep 24, 2008 | 01:00 AM
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Yes, mine is a 2005. I've done trackdays with it and never had an issue. Always had the sensors in my wheels though.

So does it go into the safety mode when everything is disabled, or just the traction control? I never use the mode that only disables traction control, but it should still not change on you. But in my experience, I either use competition mode, or turn it completely off.
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Old Sep 24, 2008 | 10:01 AM
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Do your track tires have the correct stagger? Stock is 25.7" diameter Front and 26.9" Rear diameter. Wrong diameter difference will confuse the computer.
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Old Sep 24, 2008 | 02:44 PM
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when I try and turn the traction control off completely. as i am making my way around the track and go into a corner, the car will re-ingage traction control. there is so much loss in power it is hard for me to tell if it is in safety mode or just in complete traction control. the dashboard indicates that traction control is back on.

my tires are 305-35's R18 front and back. i dont know exact diameter but not stock obviously. car is much more competitive with this set-up (also by the way has pfadty sway bars, hypercoil springs, full roll cage in terms of suspension changes).

just to clarify, you are: able to turn the traction contol to the off setting; drive vigerously around the track without it kicking back in automatically?

thank you again - I very much appreciate input for this problem.
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Old Sep 24, 2008 | 03:34 PM
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Originally Posted by jiggyracing
just to clarify, you are: able to turn the traction contol to the off setting; drive vigerously around the track without it kicking back in automatically?
Yes, that's exactly how mine responds. It stays disabled, even in a big slide or spin.

When you say that you disable traction control, do you mean you are only disabling traction control, or active handling as well? If active handling is still on, I could see how that would cause problems, because with the same size tires all around, the computer thinks your rear wheels are spinning the entire time.
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Old Sep 24, 2008 | 04:08 PM
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Originally Posted by haljensen
Stock is 25.7" diameter-Front and 26.9" Rear diameter. Wrong diameter difference will confuse the computer.
Your track tire\wheel set up are 26.4 inches in diameter vs the 25.7" stock fronts and 26.85" rears.

The rears are 0.45" smaller - just under the 1/2" most people site as tolerable. The fronts however are 0.7" smaller than stock - this might be a problem - but I cannot say for sure.

Hope the info is useful.....
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Old Sep 24, 2008 | 11:09 PM
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thank you all again - this info is very helpful.

regarding "what am I turning off?" I am beginning to wander? I dont have the car here with me (it is at a shop) but i am going to the "third setting" which I thought was TC and AH off. I read another thread and it seems that one has to hold down the button to turn both off. I dont' remember that in my manual by I will check again.

also, another thread mentioned that pro racers ran faster lap times in competition mode - despite their seat of the pants feeling otherwise. so, it maybe better to run in competition mode. to date the car has been very competitive, running faster then much way more expensive modified M-3's in my class for example.

again thank you.

does anybody know if SCCA T-1 corvettes are still all C5 ZO6's or have some C6's made appearances yet?
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Old Sep 24, 2008 | 11:24 PM
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thank you all again - this info is very helpful.

regarding "what am I turning off?" I am beginning to wander? I dont have the car here with me (it is at a shop) but i am going to the "third setting" which I thought was TC and AH off. I read another thread and it seems that one has to hold down the button to turn both off. I dont' remember that in my manual by I will check again.

also, another thread mentioned that pro racers ran faster lap times in competition mode - despite their seat of the pants feeling otherwise. so, it maybe better to run in competition mode. to date the car has been very competitive, running faster then much way more expensive modified M-3's in my class for example.

again thank you.

does anybody know if SCCA T-1 corvettes are still all C5 ZO6's or have some C6's made appearances yet?
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Old Sep 24, 2008 | 11:32 PM
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wow, do i feel like an idiot. just read in the manual that i have to push button for five seconds to turn off both AH and TC. i was not pushing the button for five seconds. It is really about asking the right questions!

the interesting thing will be whether or nor my lap times improve. I am beating the competition but will see if I beat them by more.

other issue: Does "Competition Mode" beat up the rear differential?

I'm not sure that I'm ready to spend 3g for an LG rear differential cooler.
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Old Sep 25, 2008 | 12:40 AM
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If your tires are not the correct stagger you will NOT be able to control T/C, A/H, Comp Mode or T/C & A/H OFF. Get the correct tire stagger and everything will work as designed.

The way the computer is set up you must have smaller front tires and bigger rear tires and they must be in the correct front to rear ratio.
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Old Sep 25, 2008 | 01:02 AM
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You dont run faster in comp mode than with everything off. In a Ferrari or other high end cars maybe, definitely not Corvette.
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Old Sep 25, 2008 | 01:36 AM
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Originally Posted by jiggyracing
i have a 2005 c6 corvette dedicated track car. it runs in the race group with NASA in Arizona and California.

I have to keep the car in "Performance Mode". If I put the car in "Traction Control Off" mode, traction control automatically re-engages and puts the car in a safety mode as soon as I start even moderate cornering.

Anybody know of a way to re-program the car?

Also, tire pressure sensor monitor issues. I have resorted to 4 Kart tires in the trunk with the tire pressure sensors mounted in the Kart tires. This allows me to switch my real tires without multiple efforts to reprogram. I still am having to reprogram the tire sensors multiple times during a track weekend? Any software solution for this problem?

Thanks much

Call me...I'll try to set you up right.....

If you remember, last year a race team in CHINA flew me over there to calibrate their full scale professional C6 ZO6 round track cars.

I provided stand alone harnesses and tuning services for a winning season....

NO T/C, NO ABS, NO ACTIVE HANDLING, NO TIRE PRESSURE SENSORS....

I can help you.
Chuck CoW
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Old Sep 28, 2008 | 01:06 AM
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thank you all again for the info.

i have some left over toyo r8888's that were on my stock wheels. i am going to buttonwillow in a couple of weeks and will bring those along to see if the stagger makes a difference.

thank you Chuck CoW. I tried your shop on thursday and will try again during the week. it is hard for me to reach people on the East Coast during the work week from here in Arizona.

my e-mail is jiggyracing@aol.com if you can please contact me.

thanks everybody - i was close to giving up on my c6.
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Old Sep 28, 2008 | 10:48 AM
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If you want to run 315mm F & R; use your 315/35/18's for the rears and get 315/30/18 for the fronts.

The 315/35/18 is very close in diameter to the stock rears (26.68" vs 26.85 stock) and a 315/30/18 would be very close to stock front diameter (25.44" vs 25.71").

Your tire pressure problems are probably because the computer isn't getting the update from a rotating sensor after xx miles @ xx speed. Best to buy another set of TP sensors so you have a set mounted to both sets of tires and get a tool to re-index the TPS, it only takes a few minutes once you have the tool.
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Old Sep 28, 2008 | 02:32 PM
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Its not a big deal? All you need is HPTuners or EFI live etc.
Go to engine then traction control and hit disable.
Thats it. piece of cake.
You dont need a pro tuner.
I would imagine your car is already tuned?
If you dont have HPTuners or EFI live etc.
Ask your current tuner it takes seconds to fix.
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Old Sep 28, 2008 | 05:05 PM
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Originally Posted by jiggyracing
thank you all again for the info.

i have some left over toyo r8888's that were on my stock wheels. i am going to buttonwillow in a couple of weeks and will bring those along to see if the stagger makes a difference.

thank you Chuck CoW. I tried your shop on thursday and will try again during the week. it is hard for me to reach people on the East Coast during the work week from here in Arizona.

my e-mail is jiggyracing@aol.com if you can please contact me.

thanks everybody - i was close to giving up on my c6.


Call me ANYTIME!~ Have no fear...I never get to go home... Don't worry about the time difference. I'm usually there till midnight or later my time. This is a busy time of year for us.

I'm traveling this week starting tuesday...But, the shop phones will forward to my cell....

Chuck CoW
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Old Sep 28, 2008 | 11:52 PM
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I cant run a bigger tire then 305's as i will gain too many points to run in my class.

i have a reprogrammer already which i use. the Kart wheels are so thin they quickly reprogram compared to the wheels on the car. between sessions, i check to make sure that they are still being "sensed"

i wish that i could run the 335's - sounds like it would make life easier and of course i wish that i could run 335's
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