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Polish the axles and use graphite as mentioned. Making sure the wheels turn freely without excess woble is key. There does need to be a small amount of wobble in the wheels for the car to run freely. This is part of the art of building one of these thing to win. Another trick is to apply some graphite on the sidewalls of the tires to reduce friction when the tires touch the guides on the track. There is much debate on where to place the weight. Placing the weight in the rear of the car helps on tracks that level off before the finish. Placing the weight in the front of the car is better on tracks with a steady grade right to the finish. Body shape seems to play no real role in performance, so you can let your son preety much do as he pleases in this area. Painting and decorations are a top priority with boys, so spend some time with your son planning the apearance. The most important thing is to enjoy the time building the car and don't worry about the results. Have fun and good luck.
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