mickp asked a similar question in the tech section. Usually running around 30-32 psi is good. I have 255/35 R18 with 34 in but that's me. Check the tires are wearing even after a few thousand mile. If the inner is worn more than the outer edges the tires are over inflated, if the outers are worn more then they are under. (outer and inner defined with respect to a loose wheel.)
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'99 Z28 A4, 253 LS2 heads, 228R TSP cam, Patriol Dual Springs, Double roller timing chain, LS6 ported oil pump, OBX LTs, 3" True Duals, LS6 intake, 42lb/hr injectors, SLP lid + bellow, EFIlive COS 3 Speed Denisty Tune (self tuned), 3200 Circle D stall, CAI mod, KYB AGXs, Eibach Pro Front Springs, UMI panhard, LCA + Brackets, Strut Brace, Custom Subframe connectors, WS6 axle with 3.42s, 18" American Racing Rebels, US mirrors, 93 tail lights, 3.5 inch custom cowl hood. Mickey T's Street DRs on Vette-ZR1 wheels for the strip !
Best ET: 12.0 @ 116 mph (on a 0-60ft of 1.8 s)
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cheers Jason.
. Cheers Jason.