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Old 09-13-2007, 01:07 PM   #1
Gorrella
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Default Drag coefficient ?

Anyone know what the drag coefficent is for the C6 Z06?
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Old 09-13-2007, 01:10 PM   #2
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.34cd
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Old 09-13-2007, 01:46 PM   #3
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Thanks !
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Old 09-13-2007, 09:47 PM   #4
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0.31 measured by Sport Auto in their wind tunnel.
GM published 0.34, but maybe the car got changed from the pre-production to the 2007 model that Sport Auto tested.
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Old 09-14-2007, 08:51 AM   #5
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Now that .31 sounds right. If you do the math, a stock Z doesn't have enough HP to push a .34 car to 198 mph. But it can with a .31 coefficient of drag.
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Old 09-14-2007, 09:12 AM   #6
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It is .31

Here is a link to one of several websites containing the same information - obviously taken from marketing materials provided by GM at the launch of the C6Z.

http://www.06z06.net/06_z06_body.htm
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Old 09-14-2007, 09:12 AM   #7
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Quote:
Originally Posted by 6Speeder View Post
Now that .31 sounds right. If you do the math, a stock Z doesn't have enough HP to push a .34 car to 198 mph. But it can with a .31 coefficient of drag.
i dont know how to do the math, want to share with us?

i got the figure from the new issue of corvette quarterly. they had specs for all 3 models/z-coupe-vert
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Old 09-14-2007, 09:25 AM   #8
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Quote:
Originally Posted by 6Speeder View Post
Now that .31 sounds right. If you do the math, a stock Z doesn't have enough HP to push a .34 car to 198 mph. But it can with a .31 coefficient of drag.
CD is only part of the equation. You need to know the area as well before you can determine anything.
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Old 09-14-2007, 10:00 AM   #9
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I have also read and seen in print .34 for the Z06. I think the c6 coupe is like .29. What was funny was the fact a 93 firebird had a lower cd than the current z06 - doesn't seem to bother me that much when I hit the gas
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Old 09-14-2007, 10:36 AM   #10
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.29 for the C6
and
.34 for the Z06 are the numbers that ring a bell.

The increase is probably due to the increased frontal area and the extra intakes and the spoiler.

This most certainly isnt "simple" math. Not complex, but not simple!
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Old 09-14-2007, 10:45 AM   #11
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Also the wider tires on the Z06 increase the cd.
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Old 09-14-2007, 11:35 AM   #12
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Quote:
Originally Posted by ramsundaram View Post
.29 for the C6
and
.34 for the Z06 are the numbers that ring a bell.

The increase is probably due to the increased frontal area and the extra intakes and the spoiler.

This most certainly isnt "simple" math. Not complex, but not simple!
Frontal area is separate from Cd. The reason Cd is higher for the Z is larger grill opening, lip spoiler, larger brake vents, different shaped fenders, rear spoiler, and wider tires, among other things. Cd is just a simple coefficient that is made up of many complex factors. Ultimately, drag increases with downforce design. The lift reduction at the front and rear of the car contributes to drag. The best way to compare drag data is Cd x A. This will give a good idea of drag effect differences between two different cars. A BMW M6 has a (slightly) lower CdA than the C6 Z06. The Viper SRT-10 has a (much) higher CdA. This is why an M6 with less power has a slightly higher (ungoverned) top speed than a Z06 and a Viper has a slightly lower top speed with more power. Your best bet for highest Vmax in a new Vette is to purchase a base C6 and add power (H/C, FI, or swapped LS7).
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Old 09-14-2007, 01:06 PM   #13
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Quote:
Originally Posted by robvuk View Post
CD is only part of the equation. You need to know the area as well before you can determine anything.
That's correct. Both needed. And the horsepower @ rpm in question.
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Old 09-14-2007, 01:23 PM   #14
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Quote:
Originally Posted by ShawnDFW View Post
i dont know how to do the math, want to share with us?

i got the figure from the new issue of corvette quarterly. they had specs for all 3 models/z-coupe-vert
I have the program as a zipped excel file. Only 8K in size, but I can't post attachments. If someone who can will e mail me I will send it to them to post for all to play with. Please, not everyone on the board.
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Old 09-14-2007, 01:33 PM   #15
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Quote:
Originally Posted by 6Speeder View Post
Now that .31 sounds right. If you do the math, a stock Z doesn't have enough HP to push a .34 car to 198 mph. But it can with a .31 coefficient of drag.
Theoretically. But noone has achieved that GPS confirmed velocity in a stock C6 ZO6 yet . . . Maybe the reason is because the Cd of the C6Z really is .34; I honestly can't see it being lower than the C6

I'd try the GPS top-speed experiment with a C6Z in the name of science but I don't have one



Quote:
Originally Posted by BLU-BY-U View Post
I have also read and seen in print .34 for the Z06. I think the c6 coupe is like .29. What was funny was the fact a 93 firebird had a lower cd than the current z06 - doesn't seem to bother me that much when I hit the gas.
That's interesting. In what publication did you see that figure?
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Old 09-14-2007, 01:33 PM
 
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