My back tires are pretty bald but the fronts have great tread still so I'm not sure what happened. Had my tires originally at 34 front and 28 rear then after my 8.17 pass I ran again and got a 8.23 with a 1.87 60. So I kept dripping psi slightly each time and couldn't do any better worse pass was a 8.29.
That's about what I thought it was. I was hoping for 7s just have to get her to hook .
8.17 1/8 mile = 12.75 1/4 mile
8.37 1/8 mile = 13.05 1/4 mile
That's a good bump.
I wonder if those 12" wide wheels are doing something weird to the tread on your launch? I about crapped when Reece showed me his time slip with that 1.5 on there. Your running the 305x50rx20 420's yes?
it would have a tendency to cause the center of the tire to cup in towards the wheel more so than on a 10" wide or narrower wheel. specially at lower pressures. dropping tire pressure might not be the right way to go with those wide wheels on there.