Hi guys I have a similar question like Sweeteviljesus had, Us dad’s are having our own pinewood derby race same rules only 2 difference.
1.It has to look like a real car, and
2. we have a 10. oz max.
So my question is should I try to max it out to 10 oz or a good 6 or 7 oz. I know at 5 oz you should try to max it out. but would it be the same for double the weight. (again because of the straight away would 10 oz be to heavy and slow it down more then a little lighter one. any answers would be great thanks. oh by the way mine is a cobra shelby. 
The same physics applies - max it out. That will give the carthe most kinetic energy at the start of the level section, and it will track straighter.