Quote:
Originally Posted by MickAv8r
Dont worry about it too much. Set them at the OEM pressures and then listen to your instructor. As the day progresses you'll be letting air out as the tires heat up and pressure increases. On your first track day you'll be concerned more with learning the line and learning how to brake than extracting much performance out of the car. If the tires are especially stiff or soft your instructor may advise you to adjust the PSI's accordingly if the sidewalls are rolling on you, but overall just set em to OEM and watch/learn how they behave as they get heat into em.
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Great advice... although I still remember my first track day, my pressures getting way too high by the end of the last couple sessions.
Figuring out good starting pressures depends on many variables - first and foremost, your specific tires and sizes - but a typical hot tire pressure target is 38psi. So if you're running in hot summer weather, then starting at around 30-32 psi "cold" is a safe bet.