For the stock 225 front, 265 rear on 18's, porsche lists 29psi front and 36psi rear. If you want to dial out some additional understeer, you might try 36 all around.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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