I was running 18-20 lbs of boost and I had the 315 bfg dr's, heated them up until I could see smoke, rpm's to 4000, let out clutch as I gave it more gas,(feather clutch), 1.80 60', 12.1 1/4 mile, I was still learning, just ease up on the gas if your back end starts hopping, and it won't with the bfg's !!!