Question re: tire spin
Race Director
Joined: Aug 2001
Posts: 11,028
Likes: 5
From: Chicago (Naperville) IL
I used to have 2.73s, and it was very much like what you are describing (very little tire spin). I switched to 3.42s and a 2800 torque converter and can barely control the car anymore (unless I burn em up first), and I pray before the car shifts out of first so I don't do a 360 on the chirp. However, my baby used to seem it could run way above 170, I ran it at 168 with 2.73s and it was going strong. Now around 150 I already feel the effects - but it sure does get there in a flash. 
. Tough decision based on your preference.
Good luck
. Tough decision based on your preference.Good luck
Race Director
Joined: Apr 2003
Posts: 19,350
Likes: 654
From: Tampa, Florida
QUOTE: I have a 3 month old 2004 coupe with the A4 and 2.73 gears. This may sound odd, but it will only squeal the tires a little off the line and no chirp with the 1-2 shift at wide open throttle.
HOWEVER, at half throttle, it will spin the tires off the line as well as chirp the tires on the 1-2 upshift. Go figure that one!
And by the way, it is not so much horsepower that spins the tires off the line as it is torque. Also, at the rear wheels, your stock vette is probably only putting around 285-290 ponies to the pavement. That 350 figure is figured at the crankshaft.
My car does the same thing. Something that hasn't been touched on yet is the Torque Management (TM).
A4's TM kicks in under certain conditions to prevent damage to the drivetrain. Depending on what your doing and how severe it is different measures are taken to reduce torque to the back wheels. I notice it kicking in when the driveshaft feels like a rubberband winding up.
50% throttle may not be one of the parameters for TM intervention but 100% sure is. The value for TM can be changed with any of the editing programmers.
HOWEVER, at half throttle, it will spin the tires off the line as well as chirp the tires on the 1-2 upshift. Go figure that one!
And by the way, it is not so much horsepower that spins the tires off the line as it is torque. Also, at the rear wheels, your stock vette is probably only putting around 285-290 ponies to the pavement. That 350 figure is figured at the crankshaft.
My car does the same thing. Something that hasn't been touched on yet is the Torque Management (TM).
A4's TM kicks in under certain conditions to prevent damage to the drivetrain. Depending on what your doing and how severe it is different measures are taken to reduce torque to the back wheels. I notice it kicking in when the driveshaft feels like a rubberband winding up.
50% throttle may not be one of the parameters for TM intervention but 100% sure is. The value for TM can be changed with any of the editing programmers.
Race Director
Joined: Apr 2003
Posts: 19,350
Likes: 654
From: Tampa, Florida
Drifting
Joined: Sep 2003
Posts: 1,471
Likes: 0
From: Prosper TX
16.5K on my A4 with 2.73 and I can spin the rears with no issues. I put it in first, hit the gas about 2/5 of the way down and hold on. But if I do full throttle from a stand still in drive I barely get 1 full revolution. Has to be something in the computer.
Burning Brakes
Joined: Feb 2004
Posts: 831
Likes: 0
From: Country Boys Can Survive.
Originally Posted by Jeff in Sarasota
My 99 coupe was an automatic. It had the 3.15 rear and would smoke the tires whenever I wanted.
Jeff
Jeff
Racer
Joined: Mar 2003
Posts: 310
Likes: 0
My 03 and 04 both had /have 3;15 rear end. I don't understand how you guys say they will burn rubber without using the brake. The likelihood that I would have two c5's that are dogs is unlikely. Maybe the prvious owners of your cars had the PCM massaged? Anyway, I am getting it tuned next week and will see waht happens. I have the Blackwing and the car runs great. Just can't billow smoke unless I give some brake first.
Burning Brakes
Joined: Oct 2003
Posts: 793
Likes: 0
From: IN
Cruise-In VII Veteran
Originally Posted by Baron138
Then I started to think, The techs designed this car for performance. This means hooking up and going as fast as possible. Tire spin looses time in races. A lot of man hours and technology went in to making these cars "glue" to the road. A good smokey burnout is so cool though.
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Racer
Joined: Mar 2003
Posts: 310
Likes: 0
Burnout
Hey, you guys are exactly right! I took it out at lunch and at 1/4 and 1/2 throttle it burns rubber! So, apparently the friggin engineers even applied restrictive programming to full throttle even if you have it in competitive mode. That sucks. I'll make sure it gets deleted next week on the dyno.
That's funny, me too! 
Le Mans Master
Joined: Aug 2003
Posts: 5,473
Likes: 50
From: ================ From Toronto ================ 9/11/01 FDNY 343 Never Forget
CI 6-7-8-9-10 Veteran
St. Jude Donor '08-'09-'10-'11-'13-'14
Originally Posted by Randy's C5
I have an A4 with the performance axle (3.15) and can boil the tires on launch as well as squeal the tires on 1st to 2nd shift (in OD). IMO, this would indicate that 2.73 vs 3.15 is the difference since I have no other "performance mods".
LT
Drifting
Joined: Jun 2002
Posts: 1,847
Likes: 1
From: Iowa
Cruise-In IV Veteran
Cruise-In V Veteran
Originally Posted by boomer 33
Are you sure you are turning the traction control off?
Yup! Traction control off and in "competitive mode". The vette takes off like a scalded rabbit at half throttle, while a full throttle launch, causes it to "bog" for the first 30' or so, until the RPM's get up a bit.....then it puts you back in the seat with some authority.
You guys mention getting this "torque management" feature tuned out. Is this something that can be done with say, for example, a Predator hand held, or is this a job for someone with LS1 edit?
Heel & Toe
Joined: Aug 2004
Posts: 18
Likes: 0
From: Westland Michigan
burning rubber
Here's my 2 cents I've got a 01' A4 with 3.15 gears when I first got it could not get the tires to do much with TC off, and than did the air filter ty wrap mod with K-N filter now I can smokem with the manual guys, just need to let it breath.