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.