Quote:
Originally Posted by mr2ace
I do not think that is true...
The wing needs to be in the airstream which goes over the car. The wing on the Porsche 911 creates downforce and is functional. It is not taller than the roof. But still, you need to be going pretty darn fast in order to actually require downforce, and you need a spoiler that is designed with that intention. I doubt the one on the MR2 was designed for anything more than aesthetics.
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The 911 spoilers aren't so much creating down-force as they are counteracting Bernoulli's principal. The way the 911 is shaped it creates lift at high speed (much like an airplane wing) and by adding the spoiler it breaks up the line of the car eliminating (fr the most part) the lift generated. If you look at a carrera, they have the pop out spoiler at 60mph+ that is pretty much just to get rid of lift. The turbos, however; do create some downforce, but that isnt their primary purpose.