It really depends on the tire (and type of racing of course, but I'm assuming DE road course stuff?). With steet-ish tires (up through RS3), my car was pretty comfy at cold pressures in the 28-30-ish range (varies by weather) and coming up to ~37-ish at full temp. With the Conti GT-O slicks I've been setting initial cold pressure in the 20-23-ish range and having them come up to ~30-32. Another guy was running a 370 on Hoosier R6 this past weekend, but he was starting out much higher than me cold, I think 28-30-ish like my street tires? I don't recall how that worked out for him or if he adjusted back down.
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