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PSI is very hard to dtermine. Many factors are involved. Track surface, temperature, Car setup, Tire Model, and the level of traction that a particular tire gives throughout the life of the tire.
Always good to start off about 5 psi that what is recommended for the tire, and then play with it throughout the track day.
Mostly its less pressure if you are not gripping well.
More pressure if its gripping too much.
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