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I have a car that has tire pressures of 26 PSI front and 29 PSI rear recommended. I have done lateral traction testing on it (autoX demands cornering grip!!!) and found that my hard-compound true street tires gripped very well at 36 PSI all around. They were even better at 42 PSI. I chickened out at that point and left them at 42 PSI.
The grip was measured by the RPM that I could drive around a constant-radius circle without losing traction.
I have since changed tires to a type that has fairly well-known pressure settings for optimal traction. (I think they are supposed to be happiest at 38 PSI cold.)
-soD
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