Camaro's Cd (Coefficient of Drag) - Page 6 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Nightfall · 07-16-2011, 07:04 AM

Quote:

Originally Posted by egp

The drag coefficient CD is the ratio of the drag force to the dynamic pressure times the front area.

CD = Drag / (0.5 * rho * A * U^2)

where,

Drag is the force in Newtons (or lbf)
rho is the density of air in kg/m^3 (or slugs/ft^3)
A is the frontal area in m^2 (or ft^2)
U is the velocity in m/s (or ft/s)

ok im lost wow i dont understand that at all

*DGthe3* · 07-16-2011, 11:01 AM

Quote:

Originally Posted by Nightfall

ok im lost wow i dont understand that at all

He showed the formula for how the Cd is calculated using drag, air density, area, and air speed.

If it doesn't make sense, don't worry ... you'll probably never need to use it. About the only ones I can think that would use it are engineers & technicians working at a wind tunnel.

1985airborne · 07-02-2014, 02:48 PM

Whats the drag coefficient of a ZL1?

*DGthe3* · 07-23-2014, 08:50 PM

Quote:

Originally Posted by 1985airborne

Whats the drag coefficient of a ZL1?

0.387

2012_CAMARO_zl_1_eBrochure.pdf
(near the bottom of page 12)

lgKido · 07-25-2014, 03:45 PM

Quote:

Originally Posted by DGthe3

0.387

Attachment 648366
(near the bottom of page 12)

Is that "static" friction or "dynamic" friction? It takes more energy to move an object from a starting position of v = 0 than to keep it moving (v > 0)...........

*DGthe3* · 07-25-2014, 04:50 PM

Quote:

Originally Posted by lgKido

Is that "static" friction or "dynamic" friction? It takes more energy to move an object from a starting position of v = 0 than to keep it moving (v > 0)...........

Neither.

Friction co-efficients are not the same as drag co-efficients. Even though they are both used in the calculation of forces that resist an objects movement, they are very different in nature.

lgKido · 07-25-2014, 06:01 PM

Quote:

Originally Posted by DGthe3

Neither.

Friction co-efficients are not the same as drag co-efficients. Even though they are both used in the calculation of forces that resist an objects movement, they are very different in nature.

Yes, you're correct. Someone had mentioned the Normal force and I was thinking Friction = normal force x coefficient of friction of rubber against the pavement.

Later, I was thinking about my post, and I began to question what I had put in print earlier. That OP was talking about the drag on the car, not friction.

So I came back to the thread and saw that someone had already corrected me

Dupree878 · 07-27-2014, 03:29 AM

I'm sure my splitter and side skirts raise my drag, but they add downforce and stability and I can tell you that this car is tremendously more stable over 120mph than any other car I've ever driven.

Norm Peterson · 07-27-2014, 08:32 AM

Even that's hard to be sure of without actual comparative test data. The splitter may add a little frontal area, but the effect on the aerodynamic drag coefficient isn't as clear.

I would expect the coefficient of lift to drop (kind of the splitter's purpose), and that should bring a reduction in something called "induced drag". And a tiny increase in rolling drag, since any reduction in lift = more load on the tires.

Edit - I hadn't seen this thread before today, and I've been guessing 0.36 for the 5th gen Camaro and 0.39 for the S197 Mustang for various acceleration simulations, so it's nice to see some verification. Thanks, Mr. W.

Norm

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07-02-2014, 02:48 PM	#73
1985airborne One Slow Automatic Drives: 2017 GS 2010 CAMARO SS Join Date: Mar 2010 Location: NC NJ NY DMV THE BAYAREA Posts: 877	Whats the drag coefficient of a ZL1? __________________ 650HP 2010 CAMARO SS 710HP 2017 GRAND SPORT

07-27-2014, 03:29 AM	#78
Dupree878 Drives: '13 Dusk Edition 2SS/RS M6 Join Date: Nov 2012 Location: Tuscaloosa, AL Posts: 600	I'm sure my splitter and side skirts raise my drag, but they add downforce and stability and I can tell you that this car is tremendously more stable over 120mph than any other car I've ever driven. __________________

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07-27-2014, 08:32 AM	#79
Norm Peterson corner barstool sitter Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012 Location: Eastern Time Zone Posts: 6,990	Even that's hard to be sure of without actual comparative test data. The splitter may add a little frontal area, but the effect on the aerodynamic drag coefficient isn't as clear. I would expect the coefficient of lift to drop (kind of the splitter's purpose), and that should bring a reduction in something called "induced drag". And a tiny increase in rolling drag, since any reduction in lift = more load on the tires. Edit - I hadn't seen this thread before today, and I've been guessing 0.36 for the 5th gen Camaro and 0.39 for the S197 Mustang for various acceleration simulations, so it's nice to see some verification. Thanks, Mr. W. Norm