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Cd and top speed question

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Cd and top speed question

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Old

Oct 2, 2001 | 05:22 PM

#1

peccles

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Racer

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From: San Diego CA

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Cd and top speed question

Is there a formula that given a car's top speed at a given
Cd, what would the top speed be if the Cd was X?

Paul Eccles
'00 Nassau Blue FRC

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Old

Oct 2, 2001 | 06:21 PM

#2

kewlbrz

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From: Fort Worth Texas

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Re: Cd and top speed question (peccles)

here you go. There are other factors involved like gearing tire diameter etc etc...

Heres a spreadheet to calculate anything you want like that. just unzip and run.

http://www.vetteguru.com/misc/topspeed.zip

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Old

Oct 2, 2001 | 09:41 PM

#3

peccles

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Racer

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From: San Diego CA

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Re: Cd and top speed question (kewlbrz)

kewlbrz,

Thanks for the spreadsheet. What are the values
you use for frontal area for a C5? Is the effective
tire diameter in inches? Is it an average of the
front and rear?

Thanks
Paul

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Old

Oct 3, 2001 | 01:13 AM

#4

kewlbrz

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Re: Cd and top speed question (peccles)

C5

Cd:
Coupe: .29
Vert/FRC: .31

C5 Frontal Area:
20.8

Z06
21.3

Tire diameter is in inches

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Old

Oct 3, 2001 | 02:01 PM

#5

6Speeder

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Re: Cd and top speed question (kewlbrz)

Nice formula, fun to play with. One question, what horsepower are you using? CRANK, or rear wheel? :cool:

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Old

Oct 3, 2001 | 02:14 PM

#6

kewlbrz

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From: Fort Worth Texas

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Re: Cd and top speed question (6Speeder)

I copied that spreadsheet from a site a long time ago. I am under the impression that its rear wheel power. Power truely available.

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