On my Azenis RT215 205/55-16's I run 37 in the front and 34 in the rear, on the street.
When I autocross, while the tires are cold, I put 52psi in the front and 28 in the rear. After 3-4 runs, the fronts are up to about 56-57 and the rears are about 32-34. I usually blead off the rears to keep them around 28-29 after each run though.
These tires are max rated at 51psi at about 1400 lbs load. Since each front corner is about 1000lbs, plus a little more under load, my hot 56 psi fronts are theoretically safe. 4 years of this on this model of tire, sort of prove that
