QUOTE(michael7810 @ Feb 14 2014, 03:00 PM)
Notes on tire pressure. My instructor said I want the hot pressure about 34 psi. I started at 27 cold and after the first session it was 32. After a couple more (as I got faster) the hot pressure was over 34. Plus the outside temp was heating up. Several times I had to let out a half to 1 lb after a session. By mid afternoon the pressure was steady at 34 following a session. The next morning the cold pressure was 27 on the left and 25 on the right.
It's normal for the more heavily-loaded (outside) tires to heat-up more and thus see a greater pressure increase. With my Hoosier R6s I normally expect around a 6-8psi increase depending on the track, the ambient temperatures, and how aggressively I'm driving. So I typically start around 30-32psi cold all around, then equalize to 38-40psi hot all around after the warmup session. Then I'll check/equalize again after the next 1 or 2 sessions, after which I usually don't check or change anything again that day. (If really motivated, I'll take tire temps and fiddle with swaybars or pressures further, but not usually.)
So then when things cool-down again, it'll be normal for the more heavily-loaded (outside) tires to see a bigger drop than the other side and you'll see uneven pressures as you did.