This is a question that you should probably ask a michelin rep, no not the guy at the shop you buy them from, get in contact with someone at michelin that should be able to access the correct information for you.
I notice not many of the racers have replied to this, thats because there is no way we would run pilot powers on the track, most of the other answers are just opinion or personal experience, most likely with other brands of tires so that has absolutely no bearing on your tires, all brands are different, even new models of tires are different to the old ones eg: pirelli dragon supercorsa pro, 26psi cold comes out to about 31psi hot on the track, the new diablo supercorsa are recomended to run at 28 on the track, the bridgestone bt002 are recomended to run 34 hot on the track. What im getting at is there is no difinitive answer to what pressure you should have your tires set to. Set them a couple of psi lower than you would for the road, take it out for 6 laps, heat them up, see how they feel. Check pressure as soon as you come in, if they were sliding drop a psi or 2, take it out again, heat them up and then go for it, still sliding, check pressure, drop anoth 2psi, when you get it so that it feels nice without sliding to much, check pressure, thats the hot pressure to aim for, take it home, check pressure when tires are cold, that will be the cold psi to set them to on a similar weather day. Keeping in mind all this will do no fucking good what so ever if your suspension isnt set up and working right.
Call the michelin man
