What: Building a track car — things to consider and make sure you do when building your dream car for the track. If I knew then what I make money track car now: Power is almost always the last thing to focus on. Most modern cars are plenty powerful. Cool, what to do now? Here are some key variables to consider:. First thing your going to have to decide is how much money you want to put into this car, that you are realistically only going take on track a few times a year. Traxk major thing is, at the tack things, can go sideways in a hurry.