well i went to the track tonight
first run i had full air pressure in my tires and spun all the way down the track
60ft:2.492
1/4:15.563
mph:94.74
i droped the tire pressure to 40psi
60ft:2.186
1/4:14.209
mph:98.56
next run nothing changed just shift point 7000
60ft:2.196
1/4:14.083
mph:99.35
then i dropped it down to 25psi
60ft:2.045
1/4:13.810
mph:99.70
next run i launched at 5500 instead of 4000
60ft:1.981
1/4:13.598
mph:100.61
then i tried to back up the last run and botched the launch
60ft:2.006
1/4:13.810
mph:98.67
i had no wheel hop so i know the new shocks and springs helped alot

props bro. u drop ur time a lot w/ minimal changes! whats Ur setup?

nice improvement in times as the night went on. some more chair time and you will be set

How much pressure do you normally run if you "dropped" down to 40psi?

props bro. u drop ur time a lot w/ minimal changes! whats Ur setup?
sr20det redtop t25@13psi, greddy fmic, greddy boost controler, stage 2 clutch, 3"turboback exhust j30 VLSD eiboch sportline springs 1.5"drop, kumho esta 225/50/16

How much pressure do you normally run if you "dropped" down to 40psi?
they are rated at 55psi

god damn, what tire is this?

Yeah you shouldn't put that much in any tire unless it's a higher ply truck tire.

Normal tire pressure should be 32-35 psi depending on tire and vehicle weight.