Tire Pressure for Autocross

[Sammy]

I run 32 (front) and 36 (rear) for autocrossing with R-compound tires.

[racer_d]

With my R comps I ran 36F, 34R. For street tires I tried 38 all around (it was wet/raining) but well.. as someone said, ask 10 people you will get 10 different answers.

If you're really curious, get a pyrometer to check temps and also chalk the shoulder of the tire to check sidewall rollover.

More importantly - have fun chasing some cones! What event are you attending?

[edevlin]

I'm attending the Shenandoah PCA/Euroclassics Autocross at RIR, here is a blurb on it:

"Autocross at RIR: Autocross on the NASCAR oval at Richmond International Raceway on March 29! Experience the banked oval at RIR with a fast but safe autocross. There will be two autocross courses—one for practice/warmup on the infield, the other on the banked oval."


Sounds like fun,

Ed

:dance:

[racer_d]

Originally Posted by edevlin

I'm attending the Shenandoah PCA/Euroclassics Autocross at RIR, here is a blurb on it:

"Autocross at RIR: Autocross on the NASCAR oval at Richmond International Raceway on March 29! Experience the banked oval at RIR with a fast but safe autocross. There will be two autocross courses—one for practice/warmup on the infield, the other on the banked oval."


Sounds like fun,

Ed

:dance:

It does sound like fun... I'll be Instructing at the Potomac PCA Autocross school or else I would have tried to come down!

[John V]

My rule of thumb is run as little pressure as the tires will tolerate. However it depends on the surface.

High-grip surfaces require more pressure than low-grip. Hoosier A6s require much higher than Kumho V710s. Street tires in general require higher pressure because of their softer sidewalls.

For Kumhos we like 31-32psi front and rear on medium to low-grip asphalt (like Heartland park, FedEx field, etc) and low-grip concrete like Toledo. When we try Hoosiers this year, probably 38psi all around to start due to the weaker sidewalls of the A6.

This on a 2000 S weighing 2900lbs(ish) with 245/35/18 on 7.5" front wheels and 285/30/18 on 9" rear wheels.