Quote:
Originally Posted by freebeard
Wake management. I labor under the possible misapprehension that a diffuser nets downforce without increasing drag.
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The 2.8-degree 'long',and 4-degree 'short' diffusers prevent underbody separation,allowing pressure regain at the wake,increasing the base pressure and lowering pressure drag.
Anything steeper than these will generate separation and drag,while telegraphing low base pressure under the diffuser to create downforce.It's a trade off.
Ferrari has drag-reduction valves in their diffusers that can be turned on and off,depending on straightaway high speed,of cornering ability.