[lincpimp]

With a 7xl geared 18t pinion you may get 15mins out of a 6000 4s pack. My setup was over 20mins with a 6000 pack geared 15t pinion. 5s on a 8xl may be a better setup, but then a quark/mgm controller would be required. It would run cooler than the 7xl 4s combo and be able to be geared higher. My buggy is the mbx, so it is identical to the gtp, drivetrain and gearing are the same.