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What would be the ideal tifre presure for street, on 205/55/16 Falken Azenis tires, and what would it be good for Auto-X

 
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For the street 32 front 30 rear..... WHen I autocross I run 37 Front 33 Rear, but then I'm running a good amount of Negitive camber on the nose. Before I was running 45 Front and 32 rear.

 
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How do you determine the right amount of pressure in your tires when autocrossing?

 
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Ideally, with a pyrometer. When you have even tire temps across the tire, you got it right. The way most people do it is with a shoepolish mark on the outside. When you're rolling the tire over to the top of the triangle that indicates where the wear bars are, you got it close enough. The rears are on feel.