Quote:
Originally Posted by oldtamiyaphile
Hucho says Opel saved 0.003CD by cutting a ~930mm section from the centre of the Calibra airdam. Drag increased either side of this.
Hucho doesn't seem to go into detail as to the hows and whys of this.
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He does a little:
-"Apparently, by the former measure [the cutout in the airdam] the obliqueness of the flow to the front wheels was attenuated."
-"The central cutout in the spoiler may improve the flow at the end of the underbody, so that a diffuser can work more effectively."