Quote:
Originally Posted by Vanne
(39 psi?? Wait.. what????... This is absolutely waaaaay to high..)
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That is the hot pressure (tires at full operating temp). Take the pressure right after you get off track. Depending on your car and skill level, this could be anywhere from 28-32 psi cold. Again, those hot pressures are from Toyo and Michelin directly--I didn't make them up.
The reason that the manufacturers are specifying a hot pressure are as follows:
1. Hot temperatures are the operating temperature. This is the temperature which optimizes the contact patch, sidewall roll-over and the compound's ability to grip.
2. Setting your cold pressures to 32psi on a freezing day is going to yield a different hot pressure than 32psi on a 90deg day.
3. Hot pressures will be affected by driving style, course material and temperature and whether it's wet or not.