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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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As a "build" to Jacko241's post above....
-drag is proportional to the SQUARE of velocity ( v*2)
- Hp necessary to overcome that drag is proportional to the CUBE of velocity ( v*3)
I've posted on this before with the same example. My '85 Carrera has 200- 207 hp stock and is geared to hit redline and top speed ( 150 mph) at the same time in 5th gear....nice touch.
So...assuming roughly equal aero ( not quite...but it serves to illustrate the math).
(165/150)* cubed x 207 hp = 1.3331 x 207 = 275 hp.
This makes sense as I previously calculated what it would take to hit 200 mph...and it matches the hp developed by Ruf CTR fairly well...for a car that did slightly better -->
(200/150) * cubed x 207 hp = 2.37 x 207hp = 490 hp.
- Wil
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Wil Ferch
85 Carrera ( gone, but not forgotten )
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