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Posted by gorper (more from gorper) on Wed, 25 Sep 2002 23:52:06 Share Post by Email
In Reply to: It's me again...SCCA help..., Rookie, Wed, 25 Sep 2002 17:19:52
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Chris,

I don't think your tires are going to like 35 psi up front. Borrow some white shoe polish from someone at the event and mark the tread edges where they meet the sidewall to gauge how far the tires roll over on your first run. I'm pretty sure you'll be riding on your sidewalls up front @ 35 psi. If anything, run 40 up front, 35 rear. This is a general, well-accepted rule of thumb for front drive autocrossing (see link below, which I found via scca.org).

Ideally, you want the lowest pressure you can run without rolling over onto the sidewall. finding these pressures can take multiple runs. Another thing to bear in mind is that ideal pressures vary from tire to tire & car to car, so one person's specs for their Michelins may not work on someone else's Toyos. I have heard of people running 12 fewer pounds in the rear on their front drivers. Tires, car, driving style & driver preferences all come into play.

A thing I learned this weekend about rear pressures on a front drive car: you can achieve oversteer by going higher or lower, but if you go higher, the oversteer can be snap sudden; it's more predictable when you go lower.

.02

posted by 216.160.97...

http://www.tirerack.com/features/solo2/handbook.htm#bring

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