I just need a straight answer; what is the purpose of fender vents you see on these widebody over-fendered race cars? Imagine the BMW DTM cars and even the GT-R GT1 example I gave here.

It doesn't vent anything from the engine bay, and they are only over the tire, is it literally to help vent off heat from the rubber?

 

I know there are people that are way more knowledgeable than me, but I understood that some of the vents are part of the areo package. There's a video somewhere on Speedhunter's website that shows a Nismo engineer talking about those vents on their Super GT GT-R.

 

Here's your answer.

http://auto-racing.speedtv.com/artic...on-prototypes/


Quote:
... Louvers are used over the fenders of sportscars to relive high pressure that builds up from the fast spinning tire, and from the complex interaction of air flowing in, out, and through the wheel arch.

The general rule is the more air you can extract from the wheel well, the better. On street courses, prototype teams will usually sport the biggest, longest, and most aggressive forms of louvers to vent air and create downforce. Another aspect of most louvers is their taller height (to give air a ‘chimney’ to flow out from) – that extra height adds more volume to the outer profile of the car—making a bigger hole for the passing air to go over and thus reducing straightline speed. ...

 

yeah its to get rid of the high pressure. i wouldnt imagine the tire would cause so much but the air getting trapped at high speed sounds about right

 

Interesting....

Thanks for the detailed responses guys.