All Things Mk5 > Members Rides
Sunset Red 1.4 TSI(TFSI) GT Sport - daily drive & track car
rex:
I might be wrong, but the whole car acts like a wing. So, a gurney flap should reduce drag and, maybe, add very little downforce.
I've seen a lot of cars (like Nascar cars) that have some sort for a gurney flap on the truck, and there isn't any flow under either.
If that is wrong please correct me.
rich83:
I know very little about the flap but I'm just going on what my brain tells me
rex:
From what I read, that is only one gain of the gurney flap.
Here is an interesting and educational video:
fuscobal:
The whole car acts like a wing only for race cars that have long and high diffusers underneath. Otherwise, you will have an area of high turbulence at the rear of the car. What you're using there will bring no noticeable downforce whatsoever. In order for that gurney to work you need to have a wing and airflow must go both above and under it. As you see in the pics posted by Richwig83 the gurney only brings downforce by keeping the flow underneath the wing attached at an aggresive angle of attack. If you have no flow underneath, it can't help (and by flow underneath I don't mean under the car but right under the gurney, like on a wing) !
rex:
Well, I am not expecting miracles, but I suspect it will have a small positive effect. Remember that a rear wing like yours is not an option for me because I will lose time because of the drag than gain because of the increased downforce. So if there are any benefits, thats great!
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