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My 60 fts are inconsistent, do I need new rubber?
Made five runs today and my MPH was consistent but 60' times were all over the place:
60'_______1.85____1.73____1.66___1.79____1.80
1/8_______8.03____7.91____7.81___7.96____7.98
MPH______85.5____85.6____87.1___87.0____86.9
After the first run I left at about 1200 RPM, anything higher than that and the tires just broke loose. But even at 1200, they still spun on the last 2 runs. I am running MT ET Streets 235/60-15 with 14 psi on all runs except the first (16 psi). I also running slapper bars with 0.75" gap and 3 deg pinion angle. Are my tires toast? I have 45 - 50 runs on them, maybe 3000 miles on the street from Aug 2007 to present. There is plenty of tread before is gets down to the wear indicators, but do I need to retire? The last four runs were with the same launch rpm and in the same lane. Why do my 60' times vary so much? How many runs are these tries usually good for?
Made five runs today and my MPH was consistent but 60' times were all over the place:
60'_______1.85____1.73____1.66___1.79____1.80
1/8_______8.03____7.91____7.81___7.96____7.98
MPH______85.5____85.6____87.1___87.0____86.9
After the first run I left at about 1200 RPM, anything higher than that and the tires just broke loose. But even at 1200, they still spun on the last 2 runs. I am running MT ET Streets 235/60-15 with 14 psi on all runs except the first (16 psi). I also running slapper bars with 0.75" gap and 3 deg pinion angle. Are my tires toast? I have 45 - 50 runs on them, maybe 3000 miles on the street from Aug 2007 to present. There is plenty of tread before is gets down to the wear indicators, but do I need to retire? The last four runs were with the same launch rpm and in the same lane. Why do my 60' times vary so much? How many runs are these tries usually good for?