2006 Pininfarina Ferrari P4/5


Downforce:
174 lbs. @ 150 mph, with 402 lbs. of drag
252 lbs. @ 180 mph, with 578 lbs. of drag
311 lbs. @ 200 mph, with 714 lbs. of drag

Aero. Balance @ 200 mph:
F: 258 lbs.
R: 52.5 lbs.

Lift-to-drag ratio: .433:1
Coefficient of drag: .34
Coefficient of lift: -.148
Reference area: 1.906 m^2

I'm told car's "realistic" Cl total might be more like -.003 as the rear actually generates lift in most normal circumstances, Clf: -0.013 (27 lbs. downforce), Clr: 0.010 (21 lbs. lift).  That's approximately 6 lbs. of total downforce at 200 mph.

Reference: Pininfarina


ęCopyright 2008, Michael J. Fuller