What gearing would everyone recomend for a carpet oval track that has a 158 ft centerline.I will be running a BloodyKnife With 4 cell with a trinity street spec 21 turn motor.The tires are brand new purples and greys.The gears are 64 Pitch.It came with a 86 tooth spur gear so which pinion wuld you recomend starting with and should i change the spur gear too?