to all the autoX: im looking for a good tire pressure for my SO1's(which will go to SO3's in about 6 months). i have ran 40 all the way around, but i want to see what others run. i plan to get kuhmos for race in about 6 months too, just no money at the time.
kris

 

I run 40 also. You might try posting this in the brand new and improved race tech section.

 

43 in front. and 41 in the rear! That should be PERFECTLY NEUTRAL! <-- Thats for an R1

42 and 42 if you have a base.. <-- base

R1 has a larger sway bar...

 

I have Yokohama AV4 and when I autocross...I bump mine up to 40psi. The limit on the tire is 45. Makes for a super stiff ride. Enjoy and don't hit any cones

 

Here's a link to a great write up on adjusting tire pressure to current track conditions using chalk markhttps://www.rx7club.com/forum/showthread.php?s=&threadid=80464&highlight=tire+pr essures -

 

Superfast,

There are far to many variables involved (tire, course, ambient temperature, course temperature) to just set your tire at a PSI based on other people’s experiences. The information above should be your starting point for your first run.

Most performance tires have several small triangles located on the outer edge of the sidewall. These triangles should have wear marks (from aggressive cornering) approximately one half of the way through the triangle. If there are not wear marks on the triangles (and you are exceeding the cornering limits or sliding the car) reduce your tire pressure. In the case that your wear marks are below the triangle, increase your tire pressure.

Once you get the pressure sorted out, do not adjust the tire pressure to compensate for the car shortcomings (i.e. under steer or over steer). When you readjust the pressure (front or back), you will be removing traction from one end, to compensate for a shortcoming in the other end. (Why would you reduce the overall traction throughout the entire course to gain over steer / under steer when you can do that at will with the throttle / brakes?) Use the throttle and brakes (Left-foot braking) to compensate for any ill handling you may incur. Hope this helps.

Tom