[jluetjen]

chrisreale;
My experience is that it is virtually impossible for a 3rd party (short of the tire manufacturer) to make a specific recommendation for tire pressures. Even when I've used the tire manufacturer's specific recommendation, If found that nothing surpasses the value of good record keeping. As a rule I have always kept the following information from every run/session:

- The driver
- The Track, weather, ambiant temperature and track temperature (from a pyrometer).
- Suspension settings
- cold pressures
- Pyrometer readings after the run at the inside/center/outside of each tire.
- hot pressures

I've genenerally found that with that information I can fairly quickly zero in on the cold pressure settings that will equate to the desired hot pressures. Generally once they are set, I don't need to touch them again unless the tire is loosing air.

Keep in mind that it seems to be a somewhat unstable relationship, so an intitial pressure that is too low or too high will result in excess heat being generated either by the tire flexing if the pressure is too low, or the tire scrubbing across the pavement from the lack of traction if the pressure is too high. Either can cause a bit of a runaway situation as pressures will increase further due to the heat, which can cause the situation to worsen further.

The correct cold pressure will result in the hot pressures being such that the temperatures are even across the tread with a slight increase (~10 degrees) towards the inside of the tire.

I know -- you asked what time it was and I told you how to build a watch.