[TransamGTA350]

In my SS1LE:

For a 15-20 minute session, I generally go out at about 28psi and target hot pressure about 33-35psi. Over 35psi, grip tends to fall off quite a bit.

If I'm trying to set a fast lap early in the session, I'll go out about 30psi, fastest lap usually lap 2 or 3, tires about 32-33psi at that point, stay out a couple more laps and come in.

This is all with 200 treadwear tires. SC3's, Vitour P1's, RE71RS's & RE71RZ's all seemed to like about the same pressures.