Quote:
Originally Posted by Cd
So that means that this car : 
has the same drag as this truck ( both at point 36 ) :
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Cd .36 sounded suspiciously low for the Lightning--equivalent to the current Ram Ecodiesel (which uses active suspension and grill shutters to achieve it), and significantly lower than any contemporary pickup--so I did some searching.
This forum poster claims to have checked with SVT directly, who quoted Cd .44; this figure is reported by another poster as having been "published in the past." Magazine reviews of the Lightning don't report a drag coefficient, unfortunately, but they do report a drag-limited top speed of 142 mph. Plugging the approximate weight (4700 lbs) and frontal area (31.5 sq ft) into the aero calculator shows a speed somewhere north of 165 mph for the Lightning's 380 hp with the lower drag coefficient, and just over 150 for the higher. I'm going to bet the actual Cd of that truck is .44, not .36.