I don't know about the affordable part, but there are a number of timing companies that offer very accurate timing within thousandths of a second. The two comp

I don't know about the affordable part, but there are a number of timing companies that offer very accurate timing within thousandths of a second. The two companies that are the most prevalent are MyLaps [1] and Westhold [2], although there are some others out there as well. Both of these are active systems that require that each competitor have a transponder on their vehicle. [1] http://www.mylaps.com http://www.mylaps.com [2] http://www.westhold.com/ http://www.westhold.com/