Quote:
Originally Posted by freebeard
Haven't watched the videos, but yes the real magic is in the roof of the diffuser.
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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.