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mid michigan had the track preped good for the $50,000 super pro challenge which starts today. i started on 4 and 5 and went to 8 and 9 one click at a time without much difference. best 60 was on 4 and 5(4 drivers and 5 pass.).
i'm now thinking the 50/50 mix of 93 shell and vp110 killed it. i'm not convinced it needed any race fuel with 11.3:1 and .036 quench. no evidence on plugs. the smaller tire (27") probably did'nt help much either.

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I`m really happy w/VP-100 unleaded gas.........you should try some cos mixing sucks and pump gas can vary too much in my opinion. How many passes on your tires and yes, I`d get at least get a 28" tire under there if you can.