Here's the last link I'm going to provide on the topic of adjusting tire pressures for driving on race tracks, not autox circuits:
http://www.summitpoint-raceway.com/i...atid=38&id=174
My own personal experience with e30 M3s, e36 M3s, e46 M3s and e92 M3s follow the tire pressure tips, as well as all other suspension tuning tips, in the links I've provided. Clearly I'm in the minority on how tire pressures should be adjusted to FINE TUNE handling characteristics, although it appears I'm also one of the few with a lot of practical experience, so please ignore all of my comments and go figure things out on your own.