If you would give the following information im sure it would help
Motor Name And Wind And any dyno numbers you might have on it.
Guestimate of Target Number of Laps
Transmission Ratio Of T4
If youre already running a stock motor try dropping 4 or 5 teeth off the pinion and see what that gets ya. That is what i have read for offroad...
large flat asphalt oval we try and run as long as we can the motor is a reedy 10 turn single i think its a ti i have a 4200 matched pack and a tekin g12 speedo i want it to have as much topspeed as possible without a meltdown and the traany is a t4 stealth 2:60