Building a 986 S for SCCA CS Autocross for National competition

[lawren]

I had my first autocross weekend in the Boxster. During the day (total of 6 runs) I kept lowering the pressures in the RE71Rs until i was rolling over to the tips of the triangles on all four tires. Not surprisingly, when i got there i was getting my fastest times - that occurred right at about 30psi. I think that will be the pressures i am shooting for from now on. Anybody surprised to hear that? I do have LCA's in the front with just under -3 degrees camber.

[SCCA_AX]

Originally Posted by lawren

that occurred right at about 30psi. I think that will be the pressures i am shooting for from now on. Anybody surprised to hear that? I do have LCA's in the front with just under -3 degrees camber.

With that kind of camber, I'm not surprised. At OEM camber levels, I would be surprised.

Be aware of the multiple variable effect. Multiple looks at a course, and you'd have gone faster with or without the pressure change. So don't necessarily attribute the lower times to the lower pressure.

The right way to do it is with a skidpad, a pad of paper, and a stopwatch. There's like maybe 20 autocrossers in the country that go to those lengths. The rest of us shoot from the hip.