ORIGINAL: GYNAIKAS
It's something to easy to make and REALLY overpriced. A microcontroller of $10 with the proper sernsors and independent clock can lap time up to 15 cars easily! I can design one but it will cost you more than $200 so go and get one once and for all...[8D]
ya know what weird, I make my own electronics (not servos)for RC's and it only takes $10-$15 to make and still works as good as good as some of those in stores except spread spectrum.