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Originally Posted by Cd
LFA.......... the car has a Cd of .40.
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Lexus LFA - Wikipedia, the free encyclopedia
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The LFA's speed-sensitive rear wing incorporates a Gurney flap and deploys at speeds over 50 mph.[40] With the wing retracted the LFA's body has a drag coefficient of Cd 0.31.[40]
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Lexus LFA - Wikipedia, the free encyclopedia
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Tanner Foust explained there was no way to retract the LFA wing spoiler (deploys automatically at 80 km/h (50 mph)) at high speeds increasing drag substantially, which had cost him 6–10 km/h (4–6 mph).
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Part of footnote 40:
2012 Lexus LFA – Review – Car and Driver
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But there is function underpinning the somewhat sedate form. According to chief engineer Haruhiko Tanahashi, an advantage of using carbon fiber for the bodywork is that it’s possible to make very sharp edges and cutoffs that improve aerodynamic performance. The LFA has a reasonably low coefficient of drag (0.31), and Tanahashi says that the car produces more downforce than any of its competitors. Even the inside edges of the door mirrors are shaped to guide air into scoops over the rear fenders that feed the rear-mounted radiators. A large rear wing incorporating a Gurney flap pops up at speeds above 50 mph.
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PORSCHE IN A2 WIND TUNNEL
Very near the end are some vortex intersections at the rear wing (tip).