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I noticed a big difference in tire pressures on the 660's. The sweet spot for me is 30lbs. I ran them for 2 events at 31-32lbs. On the 3rd event I had a decent lead so I tried lowering them. OMG what a difference. Took them to 30 and the front end was noticeably better. Lowered my time by 1.1 seconds. Went to 4th event and ran them at 30 for the whole event and set top pax. I run 19x11, 19x11.5, and 315/30/19 square. Car is roughly 3650lbs.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C
1980 Z28- resto-mod project
1979 Y84 Trans Am
1986 IROC-Z
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