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      07-30-2012, 08:39 AM   #2
pnosker
ti fan
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Drives: 14 12C | 17 X5 50i | 19 M2C
Join Date: Jan 2008
Location: NJ

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I run 42 psi front and 45 psi rear for autocross and daily driving. Yes, the sidewalls are very flimsy but at high pressures you're fine. I have the same sizes too.

I keep the rears at 45 mostly for fuel economy and to allow for power-induced oversteer but you could probably do 38-40 psi for autocross if you want a little more grip.
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