Quote:
Originally Posted by stevesnj
The OEM rear wing is just mostly for aesthetics, the functionality of a spoiler is for down force but not effective until after a certain speed. For improved fuel economy the OEM wing and under body panels is the way to go.
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Aero starts to function, as soon as air passes over the surfaces. The effect increases, roughly as a square function, so double the speed, and you get 4X the downforce. To say it does not become effective until a certain speed, is incorrect.