Don't use equal pressures f/r on a 911. I've heard that a good rule of thumb for a DE is 31/33 (f/r), and then see where the pressures go once the rubber heats up. The spiking from heat is what you're keeping an eye on. On a track, the tires will get much hotter, much faster, than any street driving would produce.
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Jack Olsen
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[This message has been edited by JackOlsen (edited 09-26-2001).]