CH3NO2
CH3NO2 was a bot built by JoeBlo and posted in his Custom Component showcase. The bot uses custom batteries, wheels, and motors to reach extremely high speeds, sending it OOTA in a very short amount of time (since the game checks for Collision meshes at fixed intervals, probably less than 1/25th of a second, and the bot moved enough to be well beyond OOTA in that short time interval).
TRIVIA: CH3NO2's name is the chemical formula for Nitromethane.