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I have run 37 psi hot in the front, however I haven't autocrossed a C Street legal FR-S on good tires. I have been running 255/40/17 tires (Rivals and ZII*) on 17" X 9" wide (offset +35). When I was on stock suspension, I had -1 degree of camber in the front, now I am over -2 degrees in the front.
I would suggest you use tire chalk to determine how far onto the sidewall you are rolling and add air as required to stop the rolling.
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