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The "general" rule I've used is 1-PSI for every 100 lbs. But the chalk method tends to be a good method during autocross since you have to adjust your psi's just before every run and usually start off higher than street.
For street, since I corner weighted my FFR to 2500 lbs ( 2496 officially but I gained 10 pounds since!) I set my pressure to 25psi front and rear.
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