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Can't launch A4 without bogging

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Old Feb 17, 2012 | 06:41 PM
  #1  
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Default Can't launch A4 without bogging

My car, 2000 c5 FRC, A4, 500+ rwhp, stroked with an A@A SC, just had a new transmission installed with a 2500 stall.

The stall is probably to small for most but my last 3200 stall i thought was bad as i had the same problems with it.

Starting from 15 mph or so i can roast my tires (Nitto Extreme 305/35zr18's) untill 3rd gear no problem. I have zero problems with the car after it gets going a bit besides traction.

The service act. handling, service trac. control is on always.

I bog down at take off's. I cant even power break above 1500 rpm (it bogs down) for a launch and that was with both stalls.

I removed the EBCM plug as I have read it helped others before but it didnt seem to help me.

Any help would be appreciated.
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Old Feb 17, 2012 | 06:48 PM
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Originally Posted by Christian66LEO
My car, 2000 c5 FRC, A4, 500+ rwhp, stroked with an A@A SC, just had a new transmission installed with a 2500 stall.

The stall is probably to small for most but my last 3200 stall i thought was bad as i had the same problems with it.

Starting from 15 mph or so i can roast my tires (Nitto Extreme 305/35zr18's) untill 3rd gear no problem. I have zero problems with the car after it gets going a bit besides traction.

The service act. handling, service trac. control is on always.

I bog down at take off's. I cant even power break above 1500 rpm (it bogs down) for a launch and that was with both stalls.

I removed the EBCM plug as I have read it helped others before but it didnt seem to help me.

Any help would be appreciated.
Have you tried turning off the active handling. Mine bogs and a start if its on. Good Luck
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Old Feb 17, 2012 | 06:53 PM
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Yes it's off
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Old Feb 17, 2012 | 07:30 PM
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Maybe the tune is way too rich at idle?
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Old Feb 17, 2012 | 07:39 PM
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I'm hoping it's something that simple as I didn't have it re tuned after the new transmission install.

I talked with the installer and he seems to think possibly a vacum problem?
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Old Feb 17, 2012 | 07:42 PM
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Sounds like your traction control may be malfunctioning, it may not be shutting off. I would also use a bigger converter.

Last edited by Hauln1203; Feb 17, 2012 at 07:47 PM. Reason: spell check
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Old Feb 17, 2012 | 07:55 PM
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I pulled the EBCM so I would assume the traction control is off plus after it get's going im spinning at will.

Grimlock, I just got off the phone with my Guy and he said it was possible and was going to talk with his tuner.

Last edited by Christian66LEO; Feb 17, 2012 at 07:58 PM.
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Old Feb 18, 2012 | 07:14 AM
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Originally Posted by Hauln1203
Sounds like your traction control may be malfunctioning, it may not be shutting off. I would also use a bigger converter.
mine behaved the same way after a bunch of mods and tunes the active handling wouldn't shut off, couldn't even do a burn out at the drag strip.....it would only turn off when in competition mode....couple changes with the HP Tuners re my trans programming and all was god again.....
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Old Feb 18, 2012 | 10:45 AM
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Here is a test.
Turn the TC off.
Put the trans in 3rd. Hold the brake and push down on the gas. If it wont spin the tires in place go to next text.
Put TC in Comp mode and try holding the brake and pushing down on the gas again. I bet it will spin!

I had same tuning problem.

Mike V
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Old Feb 23, 2012 | 03:42 PM
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Well I seem to have fixed it so far. I removed and cleaned the Chassis Ground connector G-101 found in another article (http://forums.corvetteforum.com/c5-t...tion-long.html) and so far it's working. Thanks for the help
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Old Feb 24, 2012 | 10:25 AM
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Originally Posted by Christian66LEO
Well I seem to have fixed it so far. I removed and cleaned the Chassis Ground connector G-101 found in another article (http://forums.corvetteforum.com/c5-t...tion-long.html) and so far it's working. Thanks for the help
Good deal. It's a pain for diagnosing when bad grounds make things behave strangely rather than not at all.
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Old Feb 27, 2012 | 08:31 PM
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Thx, for the post. You solved some problems for me and saved me alot of money. Cheers.
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Old Dec 18, 2014 | 09:18 AM
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i have the same problem can anyone help
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