Quote:
Originally Posted by aerohead
That's my take, at least on supercars. Ferrari has flaps that lower to a less radical angle on the straights, where cornering force isn't as important, then on approach to turns, the flaps lift, increasing the ramp angle, allowing low base pressure to communicate under the diffuser. Online, there are photographs of a Lamborghini configured for this and the tufts indicate forwards airflow down and under the car, heading for the suction peak at the venturi.
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That is NOT how diffusers work! In fact, it is 100 per cent wrong.
Refer to Chapter 6, Race Car Aerodynamics (Katz) - and numerous other references.