Autocross understeer woes
05-20-2007, 04:40 PM
#13
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Re: Mike and Kurt have basically said it.
I first started out at 49psi front cold and when they came in after a run they were at 53psi and rolling way beyond the side of the tread. I don't think all the pressure in the world would have stopped it rolling over.
One problem is that I no longer have the stock front sway bar. I thought the H-sport was going to help so I ebay'd the stock ones.
I'm going to try the mid 40s F next time and the rear at 50 and try that. The last run I brought the rears up to the front and it felt a decent amount more stable.
Now if our e-brake was a bit more sensative I could fix this with another method.
I think I'm going to start left foot braking too so I can do a better job of trail braking. It worked in my Formula Ford and in Autocrossing the S4 is a 2nd gear car so I don't need the clutch.
Oh, you can't leave in the spare tire for autocrossing.
again the rules.
Thanks,
Chris
One problem is that I no longer have the stock front sway bar. I thought the H-sport was going to help so I ebay'd the stock ones.
I'm going to try the mid 40s F next time and the rear at 50 and try that. The last run I brought the rears up to the front and it felt a decent amount more stable.
Now if our e-brake was a bit more sensative I could fix this with another method.
I think I'm going to start left foot braking too so I can do a better job of trail braking. It worked in my Formula Ford and in Autocrossing the S4 is a 2nd gear car so I don't need the clutch.
Oh, you can't leave in the spare tire for autocrossing.
again the rules.Thanks,
Chris
05-20-2007, 04:56 PM
#14
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You could always go "Bobby Unser" and just disconnect the front for the day.
Interestingly, it was on an Audi that he did that for his record-setting Pike's Peak run, after the Audi engineers gave him what they thought would be the "ideal" set-up.
05-20-2007, 05:29 PM
#15
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I keep tellin' him about that "pea-shooter" of an engine he has.................;P
05-21-2007, 02:37 AM
#19
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...yes a very nice car.
05-21-2007, 04:15 AM
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Re: Autocross understeer woes
With my current setup (Ohlins/Stasis Motorsport, H-Sport Sways) I am able to induce some oversteer when needed although I have not been able to overcome the understeer issues in some corners (the car is just too nose heavy and my tires leave something to be desired). I have the front coilovers set on full soft with rebound turned almost all the way up front and back. I typically run tire pressure equal all around (I know, but it seems to work for me). With this setup I can actually whip the back end around a bit. I am going to try to work the tire pressures next weekend and see how much that helps me.