I was on the track this weekend as well.

I started with 33.5 lbs in each tire. After a half hour of hot laps I equalized the pressure in all four tires to 38.5. I had to drop .5 lbs out of the left side as this was a clockwise track. I had no side wear and probably could have dropped the pressure a bit in each tire.

The track, Virginia International Raceway was easier on tires and tremendously easier on brakes than the Summit Point Jefferson circuit.

VIR is an Amazing place to run, the elevation change is the equal to Laguna Seca and the facilities are top notch. Highly recommended.
www.virclub.com