Drag racing 101 http://www.everything2.com/index.pl?node_id=977040
Quote Originally Posted by TransAmWS6
Trap speed is not how fast you are going at the end of 1320 ft. It measures how fast you are excelerating for the last 66ft. Therefore if you have a bad launch and you are slower off the line then you are excelerating at a faster rate during the 66ft giving you a higher trap speed vs. a really fast launch which gets you up to speed quicker and you are not accelerating as rapidly towards the end of the 1/4.

hope that makes sense