What tire pressures should I run?

[Phokaioglaukos]

I'm looking forward to seeing Geoffrey Ring's track car again (a 964?). He'll be at the Cups and Saucers at the Glen next month. He now has IR sensors so that he can record the temperature of the track, tires and brake rotors while underway.

For those of us with less tricked-out cars looking for tire temperatures, make sure to get a contact pyrometer. The IR ones measure surface temperatures which cool quickly. The termperatures a ¼" into the carcass of the tire cools much more slowly, and that is what you want to measure. (I'm great on the theory--let's see how I do on the practice, measuring temperatures after coming in on a hot lap.)