Lately I've come across some drag cars that have cut holes in their rear bumpers. They justify the action by saying that it allows air to escape from the rear bumper and helps prevent the parachute effect. I have seen claims of people dropping anywhere from .1-.4 seconds off of their 1/4 mile. I personally drive over 300 miles a week on the interstate, and if this could help me at all, Id like to give it a try.
Has anyone done any testing to prove this an effective technique?
Does anyone have the knowledge to explain to me why it wouldn't be effective?
worst case scenario, I will find an extra bumper to experiment with myself.
here is what I am talking about...
