Quote:
Originally Posted by fb5b
What sort of gearing would I need (dont have any other pinions to suit)
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You won't know till you try. If the motor is getting too hot, you need a smaller pinion. With brushed motors, I like to be able to hold my thumb on the can for a minimum of 3 seconds before it feels too hot. With brushless it's more difficult as they say to never go beyond 170*f as it demagnetizes the rotor. A little handheld temp gun is nice for checking this. Personally I would just start out with the smaller pinion and work my way up if it's staying cool...
As for the car itself, I would suggest you strip down and rebuild it. It's a complicated build and I wouldn't trust someone elses workmanship on assembling. There's tons of small plastic spacers in the axles and suspension that must be correct or you will bind up the drivetrain. Also make sure the belts are pleanty loose to keep the drivetrain free. Check that all ball bearings turn smooth and free, and make sure the diffs are tight enough that they don't slip (at least before the slipper).
Adjusting a slipper and ball diffs together can be complicated so be sure your slipper is tight enough to get you off the line, and be sure your diffs are tighter than your slipper. Set your rear diff tight enough so the rear wheels won't spin more than 1 full turn with a quick zip from the palm of your hand. Then set the front diff a little tighter than the rear.
Make sure your pinion/spur mesh is proper and quiet. Easiest way to set 48pitch gears is to simply put a piece of regular paper between the gears and set mesh as tight as you can. Now lock the motor down and roll the paper out. Mesh should have the perfect clearance and run quiet...
You are now on the road to success...