Dyno Question, ABS Issue?
Thread Starter
Drifting
Joined: Aug 2001
Posts: 1,878
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From: EP Texas
St. Jude Contributor
Dyno Question, ABS Issue?
Hello Guys:
Tried to dyno my car again today, the numbers were strangely low, though the car seems to perform just as good as ever when driving it around. Every time at about 3.5-4K PRM, right when starting WOT, the ABS service light would come on and in the DIC. They think its pulsating a little and slowing the car down? The graph does get a little choppy, which the associate with the abs? Due you have to pull the ABS fuse when on the dyno? Is the car doing something because the front wheels are not turning? What gear with an A4 is best to do the WOT pull in? Doesn't seem to have any ABS issues on the street.
Never had these problems or issues before as I always went to an out of town forum tuner, but I know the people that own this local dyno-jet, and was running the car myself.
Thanks.
Tried to dyno my car again today, the numbers were strangely low, though the car seems to perform just as good as ever when driving it around. Every time at about 3.5-4K PRM, right when starting WOT, the ABS service light would come on and in the DIC. They think its pulsating a little and slowing the car down? The graph does get a little choppy, which the associate with the abs? Due you have to pull the ABS fuse when on the dyno? Is the car doing something because the front wheels are not turning? What gear with an A4 is best to do the WOT pull in? Doesn't seem to have any ABS issues on the street.
Never had these problems or issues before as I always went to an out of town forum tuner, but I know the people that own this local dyno-jet, and was running the car myself.
Thanks.
Le Mans Master
Joined: Aug 1999
Posts: 5,411
Likes: 2
From: N Carolina 08 Z51 Coupe
I had a similar issue when I dynoed my 99.. Make sure you have traction control off... I got the ABS light on too.. but all went well.
The car is confused because the front tires are not turning. But it does not engage the ABS.
mike
The car is confused because the front tires are not turning. But it does not engage the ABS.
mike
Tech Contributor
Joined: May 2003
Posts: 7,035
Likes: 134
From: North Augusta, SC
Originally Posted by C5~Missle
I had a similar issue when I dynoed my 99.. Make sure you have traction control off... I got the ABS light on too.. but all went well.
The car is confused because the front tires are not turning. But it does not engage the ABS.
mike
The car is confused because the front tires are not turning. But it does not engage the ABS.
mike
Make sure TCS/AH are OFF and it will be OK. Just go in and manually clear out all of the codes after the dyno.
Team Owner
Joined: Sep 1999
Posts: 20,054
Likes: 44
From: Swansea IL
It's normal behaivor. Once you re-start the car all should be well.
But you never dyno a car with the AH/TC engaged, the car will fall flat on it's face. Some dyno operators miss that on their first run, then have to re-group and turn off the AH/TC and start all over again.
Tom
But you never dyno a car with the AH/TC engaged, the car will fall flat on it's face. Some dyno operators miss that on their first run, then have to re-group and turn off the AH/TC and start all over again.
Tom
Supporting Vendor
Joined: Jan 2004
Posts: 529
Likes: 0
From: Little Falls NJ
It is normal. The dyno will set off the ABS light. Upon driving the car again the light will go off.
For automatics you'd want to do a 3rd gear pull, it is your 1:1 ratio gear. If you have a stock converter it shouldn't be too hard for the operator to get your converter to lockup. The worst part about autos is stopping the car from downshifting... this is where EFILive w/ bi-directional controls comes in so you can lock the gear/converter
For automatics you'd want to do a 3rd gear pull, it is your 1:1 ratio gear. If you have a stock converter it shouldn't be too hard for the operator to get your converter to lockup. The worst part about autos is stopping the car from downshifting... this is where EFILive w/ bi-directional controls comes in so you can lock the gear/converter
