My G8 won't let me do a burnout

[G8GHOST]

I just got my '09 G8 GT a week ago, and have tried the button in the center of the heated seat buttons. When I push it, it shows Stability Control Off and ESP Off on the digital section between the tach and speedo, and allows me to roast the tires at will from a stop. My problem is when I try to powerbrake it to heat the tires, as soon as the tires start to spin I can feel the brake pedal pushing back, and the car lunges forward. The car has Brembo upgrade on the front, mild RCR cam, long tubes, Solo cat delete and full exhaust, Vararam, and custom tune. What am I doing wrong, or is this possibly a tune problem or something with the ABS?

[Slizzo]

Less brake, more throttle.

[G8GHOST]

Less brake, more throttle.
It's not that simple. I have been racing over 30 years, but these new computer control cars are fairly new to me. This is not human error. Something computer related is causing this, but I'm not sure what yet. I am planning on going to our local track Friday night and need to know how to do it. My CTSV has the button, and if pushed once turns off Stability Control, and then if U push it again and hold it for about 6-8 seconds it will disable traction control. This car obviously doesn't work the same.

[travis gore]

to much torque managment in the tune? Who tuned it?

[Slizzo]

It's not that simple. I have been racing over 30 years, but these new computer control cars are fairly new to me. This is not human error. Something computer related is causing this, but I'm not sure what yet. I am planning on going to our local track Friday night and need to know how to do it. My CTSV has the button, and if pushed once turns off Stability Control, and then if U push it again and hold it for about 6-8 seconds it will disable traction control. This car obviously doesn't work the same.

No, G8 is on or off. One press it will say it's off (and everything is off), one more press and everything is on. This is handled by the BCM, so if you've turned it off and still have issues there's something going on with the ECM/TCM tune.

[G8GHOST]

That's what it seems. I'm going to get back with the tuner. I'm putting a Circle D 3000 in hopefully next week, and from what I've read the trans tune will need to be adjusted, so I'll address both at the same time. Thanks

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[G8 GT V8]

See if it will spin then from a dead stop without hitting the brake pedal. I seem to remember there being an option in the tune needed to be disabled to allow " brake torquing" or something like that...

[G8GHOST]

Yes, it will fry them from a dead stop without the brake applied. I was thinking that it may be something in the tune also.

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[G8 GT V8]

In HP Tuners, in the engine section, there's a "Torque Management" tab. There's a "Brake Torque Limit" table that I believe is limiting your ability to fry them with the brake applied, at least that's how I understand it.

[G8GHOST]

Went to the track last night and think it may be a combination of tuning and the stock converter being to tight. Both should be fixed in the coming weeks. Thanks for the responses.

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[RWD-V8]

I believe the brake torque limit is should be set to "Enable" in the tune as that allows the TCS button to disable it when actuated after start up.

[reubone]

can you post a copy of your tune?

[STAGEUP]

Sounds like someone messed up and disabled the brake torque limit in your tune.

[G8GHOST]

can you post a copy of your tune?
I have no way of reading that yet. Plan to purchase HP Tuners soon.
Another issue I have had with it since I bought it (with stock and Circle D stall), sometimes at a stop, in drive, the car will sort of lung forward simultaneously with the loping of the cam. Really kind of hard to describe. Today I noticed, as I eased up on the brake pedal, preparing to leave from a stop but not in motion yet, from firmly pressed to the point it was about to let the car move, that it started this. Was thinking maybe it has something to do with the engine not having enough vacuum, because of the cam, to operate the brake booster. While idling, I pulled the vacuum hose from the booster and blocked the hose with my finger. The engine lope smoothed out as if maybe the brake booster is leaking. I'm thinking the burnout problem may be due to a drop in engine vacuum while pressing the accelerator, which is taking vacuum from the power brakes, and in turn making the brake pedal feel harder or as though it's releasing. Didn't have time to troubleshoot, as I was leaving for work. Will check that tomorrow and update if I find something.

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[jaydubb71]

Did you ever get this sorted out? Im having the same problem.

[Mason.larsen18]

Anyone ever figure this out I’m having the same exact issues!!]