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A tire pyrometer is also a good way of telling. You drive the car, and see if the edges are higher or lower temp then the middle. With extreme camber, you may find the inners are warmer then the outers or vice versa, in which case you would want the middle of the tire to be somewhat in between.
If the middle is too high, you are overinflated, too low, underinflated.
A lot of people run tire pressures that result in the handling they prefer, especially when you go to the track. Ask 5 people what they run for pressures and you will get 6 answers and 7 reasons why. Different cars, setups, weights, track conditions, and of course drivers preference can lead to 15+ degree variations in cold temps. I raced with a guy who would set up his cold temp 5 degrees below the max psi. He would drive 3 to 4 laps, come in hot, and bleed them all down to the max PSI, so that his hot temp was max PSI all around. He said it was the best thing ever. For his Hoosiers and his car, it could have been. For my Kumhos and my 914, anything over 29 cold PSI was asking to spin... Go figure.
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1997 Boxster 2.5L
1975 911S Project
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