In Reply to: Tire pressures for the track posted by DRM on April 01, 1999 at 14:51:05:
Here's my suggestion:
Your LF tire will take the biggest beating. Without a pyrometer and without knowing more about your suspension setups, use the following as a *guide*.
Since you're on street tires, start with something like this...
Then, take the pressures again as *soon* as you come off the track, preferably in the middle of a session. If you get it right, it'll look something like this...
If not, adjust your cold pressures to compensate for the difference.
Also, take a bottle of that white shoe polish with the sponge applicator (you'll need one anyway to paint your number on the glass), and mark your sidewalls to determine how much "rollover" you're experiencing -- you should see the polish disappearing right at the edge of where the tread starts on the sidewall (sometimes there's little triangles there...). That'll help determine whether your hot pressure is correct. If you're right at the edge of the tread and your pressures are 36 all around (hot), you're good to go. If you're showing white polish into the tread, lower your hot pressure. If you're losing white polish way up the sidewall, raise your hot pressure.
Also, TALK TO THE OTHER PARTICIPANTS. They can give you some idea of what they run. But beware, everybody's got an opinion on this. It might work for them, but it might not work for you.
Watch out, Big bend is r-e-a-l-l-y slippery when wet and those tires and bridge look really small when you're going sideways. Have fun and be safe!!! You should be running about 1:10 if you've never been there (depending on the car you have).