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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 02-27-2006, 11:55 PM   #1
pwalsh53
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ABS during track / autox events

Hey guys. Now, I've always turned off my ASC (DSC) for autocross events, but one time I tried pulling the ABS fuse because I noticed the ABS kicked in too conservatively and I was losing braking power. I am about to start tracking my car and probably going back to autocrossing (it's been a year, gettin rusty...), I was wondering what people's experiences with this have been?

When I did it the one time at autocross it seemed I could modulate the brakes fairly easily even when they were on the verge of locking up, and I felt like I had more pedal travel because the ABS wasn't kicking in so soon. I may just need to learn to be smoother with the brakes...

Anyway, has anyone else done events with their ABS disconnected?

Thanks!
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Old 02-28-2006, 01:37 AM   #2
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I didnt know you could disconnect the ABS. With that said I'd leave it on regardless.
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Old 02-28-2006, 01:49 AM   #3
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I thought pre-2002 models all could disable ABS with one push of DSC.

My ABS hasn't been intrusive at all and I've run both track and autoX before with DSC off. Maybe it's more sensitive depending on each car?
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Old 02-28-2006, 01:58 AM   #4
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Quote:
Originally Posted by leej323
I thought pre-2002 models all could disable ABS with one push of DSC.

My ABS hasn't been intrusive at all and I've run both track and autoX before with DSC off. Maybe it's more sensitive depending on each car?
Pushing/holding down the DSC button will NOT turn off the ABS.
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Old 02-28-2006, 09:11 AM   #5
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Quote:
Originally Posted by vaio76109
Pushing/holding down the DSC button will NOT turn off the ABS.
Right.
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Old 02-28-2006, 10:39 AM   #6
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ABS and ASC (DSC) run on one fuse. If you remove it, they both go away.

The ABS has always been uber-sensitive on my car, like going off when I slow down over VERY minor bumps. Maybe BMW corrected it on the later cars. I already learned that my air bag sensors were WAY over sensitive when the right side airbags deployed when I hit a pothole. They fixed it later on in the model years I think.

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Old 02-28-2006, 11:26 AM   #7
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Quote:
Originally Posted by vaio76109
Pushing/holding down the DSC button will NOT turn off the ABS.
ah ok, thanks for the clarification.

Yeah, like I said before, mine hasn't been too intrusive. I'm not sure if you can tweak the sensitivity of it or not through the dealer.
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Old 02-28-2006, 07:13 PM   #8
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I have the same car as you and I don't find ABS to be a problem at all. The local track where I go is brake intensive.

Are you maybe jumping on the brakes too quickly?
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Old 02-28-2006, 09:44 PM   #9
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Well I havent tracked my car yet. And autocross is alot more about transitions and heavy braking frequently. I might have just hit them too hard but it seemed the ABS came on too soon..

I guess I'll see once I take it to VIR :-D

Patrick

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Originally Posted by Asmodeus
I have the same car as you and I don't find ABS to be a problem at all. The local track where I go is brake intensive.

Are you maybe jumping on the brakes too quickly?
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Old 02-28-2006, 09:45 PM   #10
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Well I haven't taken it to a track yet. I've done many autocrosses and sometimes I've found the ABS too intrusive. But these are two very different types of driving..

I guess I'll know once I drive at VIR :-D

Patrick


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Originally Posted by Asmodeus
I have the same car as you and I don't find ABS to be a problem at all. The local track where I go is brake intensive.

Are you maybe jumping on the brakes too quickly?
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Old 02-28-2006, 11:00 PM   #11
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It sounds like you are using your brakes too abruptly. Once you go to VIR (have fun, btw!), you should be taught to accelerate/decelerate smoothly. I would say leave the fuse in at VIR. This being your first DE, don't worry about how fast you can stop. If you feel comfortable threshold braking (you acting as the ABS), I don't see a problem. If in an emergency, you WILL stop faster locking up the wheels w/o ABS but run the high risk of putting a flat spot on your tires.

What kind of pads are you using?
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Old 03-01-2006, 09:41 AM   #12
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Leave your DSC on for the first day at VIR. If you value you car. Leave it on the second day. If you value you life.
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Old 03-01-2006, 10:03 AM   #13
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Quote:
Originally Posted by 02SilverM3
Leave your DSC on for the first day at VIR. If you value you car. Leave it on the second day. If you value you life.

pwalsh53,
I strongly disagree with 02SilverM3, but drive how you feel most comfortable. DSC is a great feature for drivers that don't know the basic physics of car control. You mentioned you auto-x so you should have a good idea how your car acts, handles, and feels near your driving llimit. Being a beginner, you will not be encouraged to drive as fast as you can. You will progressively get faster getting pointers from your instructor with things you are doing right and wrong.
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Old 03-01-2006, 05:23 PM   #14
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Get some better tires.
ABS needs to sense wheel/tire slipage to become active.
You very well may be to agressive with your middle pedal, but a stickier tire will hold the road better and allow you to use the brakes more agressively.
I would never reccomend pulling that fuse.
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Old 03-01-2006, 07:33 PM   #15
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I was racing on Victoracer R-compound tires. I don't think the tires were the problem. I pulled the fuse for an autocross with good results, but I will probably see how it handles at the track before I make any decisions.

I am not leaving ASC on, I won't have any fun that way. Besides, it's not DSC like all you fancy 2000-on people. ASC is pure throttle modulation. It has nothing to do with yaw control or individual brakes being applied or any of that. It's essentially useless on my car. Especially considering I have a limited-slip differential, which makes the car much easier to control in a slide.

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Old 03-01-2006, 08:11 PM   #16
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Which LSD do you have?
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Old 03-01-2006, 08:35 PM   #17
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I autox and never really had problems with abs. then again I'm not going very fast around the track :/
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Old 03-01-2006, 09:28 PM   #18
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Bimmerworld / Performance Gearing 3.15

Quote:
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Which LSD do you have?
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Old 03-01-2006, 10:45 PM   #19
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Bimmerworld / Performance Gearing 3.15
Jim Blanton at Performance Gearing builds the best LSDs!!! Great guy to deal with too.
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