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Make sure on the wheel nails that you grind back the nail heads slightly so only the very center of the head is actually touching the wheel. I put the sharp end of the nail in a drill chuck and sanded lightly with emory paper, and then spin the nail inside the wheel after hitting it heavily with powdered graphite (takes the burrs off and lubricates).
Weight placed at the front of the car will get it off the line quickly, but weight in the rear of the car will make it faster at the bottom of the track......not sure which actually gets there first, but my sons car passed every car there in the last 5'-10'.
I told him that he was responsible for the body and paint, while I showed him some tricks for the weight and wheels.
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