Do a Google on pinewood derby. I remember reading someplace, all sorts of nefarious skullduggery that one can do. I don't remember the details though.
One thing was, to make sure the wheels track exactly straight, i.e. the axles are parallel. There was also stuff about weight distribution and undercutting the front end of the car so when the starting block pivots forward, your car starts moving immediately.
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Law of Logical Argument - Anything is possible if you don't know what you are talking about.