1. Chuck up the axles (nails) in a drill, and use some 600 grit (or finer) emery cloth polish them. (Not cheating).
2. polish the hole in the center of the wheel where the axle nail goes. (Not cheating)
3. Add weight to the front of the car instead of the rear to allow the car to track straighter. (Not Cheating)
4. Sand the wheels to a slight bevel so that only the inside edge of the wheel/tire is the only part of the tire touching the track. (Not Cheating)
5. Sand a slight indention into the nose of the body so that the nose of the car will sit around the starting line dowel, instead of behind it. (CHEATING)
6. Use an electronic scale to weigh car to get a close to the maximum weight (where you want it) as possible. (Not cheating).
7. Keep the body as simple an smooth as possible. Smaller bodies also allow you to move the weight around where you want it to be, instead of where the body happens to have it. (not cheating)
8. Use only dry lubricants on the wheels and axles. (not cheating)
9. Raise one wheel slightly so that it does not contact the track when racing. Reduces friction even further. (Cheating)