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Originally Posted by cody
What should my target PSI be? 40 when warm?
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Tire pressures are a funny thing. I always ask questions like this at auto-x events, and no one gives me an exact number
The reason is, its a partially a personal feel. Higher pressures will stiffen up the sidewall, so the sidewall doesn't turn over while steering and turning. But too high will cause the tire to be looser then it optimum.
Not having run on the Yokohama tires, its even harder to hazard a guess. My only advice is to drive around the track and if your sidewalls are rolling over too much, add some air. If they are too stiff and the car is too loose, let a little out. More then likely, like Sperry said, is to start maybe 5-7psi more then normal. I generally run 35ish on the streets and will start at 38 cold. Watch the temperature after the run, and adjust down or up as necessary.