I copied this from another post hopefully this will give you the idea.
Quote:
When talking about downforce you should increase downforce in both the front or the back to keep air from getting under the car and causing it to "float" at highspeeds and over bumps. Granted some of those wings are alittle overkill. But to say a wing on the back of a FWD car is pointless is a false statement. Why would FWD touring cars run them if all they did was hurt performance. I dont think they would, do you?
Downforce pushes downward on the car keeping the tires a little more firmly on the ground. The biggest time you will see a benefit is went you come up over a small hump when you can usually feel it lift, after installing a wing and a front spoiler the car feels so much more planted. By increasing or decreasing downforce you can also increase and decrease oversteer and understeer. This is where adjustablity comes into play. It takes a lot more work then just bolting it on to get it to work. Although most people dont go this far, it still helps.
Im not saying that the bigger the wing the better. I dont particular care for wings at all, but a smaller one that serves a purpose isnt that bad.
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Not all wings have a purpose but some do.