[thstone]

In autocross, the runs are so short that the tires do not build pressure like they do during a 25 min track session so many people start an autocross run with higher or "hot" tire pressures despite the fact that the tires are relatively "cold". This prevents the relatively "cold" tire from excessive roll-over. Of course, proper selection of tire pressure at the start of an autocross run is an art and there is a lot of variability in recommendations but most will say to increase (over stock pressures) as a starting point.