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Old 08-30-2011, 06:14 PM   #1
AVANTI R5
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Default Chevrolet Malibu will slice through wind like a Corvette



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Everyone wants to drive a slick car, and it's going to be hard to find one more slippery -- meaning aerodynamic -- than the new 2013 Malibu.It's achieving a drag coefficient comparable to a Corvette and nearly as efficient as the Volt electric car, Chevrolet says.

As a result, the new Malibu Eco -- the more-expensive high-gas-mileage version of the Malibu -- will achieve the best-ever fuel economy of a Chevy midsize car. When General Motors' mild-hybrid eAssist system is included, the Malibu will get 26 miles a gallon in the city and 38 mpg on the highway. The all-new 2.5-liter Ecotec engine debuting on the Malibu next summer is expected to achieve more than 30 mpg on the highway, based on GM testing.

Aerodynamic design efficiencies and a new body style helped engineers find 60 places in which they can help make the car slip more easily through the air. The differences amount to about 2.5 mpg more highway-driving range.
The new Malibu's coefficient of drag rating of 0.29 – the number used to indicate the aerodynamic drag force on a vehicle – is down from the current model's 0.35 Cd. The higher the number, the greater the drag force a vehicle's engine must overcome at any road speed. The Volt has a 0.28 Cd and the base Corvette coupe is .286.

"With the new Malibu, the design and aero teams collaborated to achieve maximum fuel efficiency for our customers without compromising the car's visual appeal," said John Cafaro, Chevrolet Malibu exterior design director. "The aero and aesthetic evolved simultaneously – working together, we sculpted the car in a way that makes it more slippery."
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Old 08-30-2011, 10:46 PM   #2
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Originally Posted by AVANTI R5 View Post
The 2010-2011 Legacy has a Cd of .29... Big whoop.
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Old 08-30-2011, 10:57 PM   #3
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Education is evidently more lacking than I thought.

A coefficient is not a final measurement.

A coefficient is a multiplier for another factor, in this case total frontal area, to come up with a final measure of aerodynamic drag.

Merely having the same multiplier says nothing about how much frontal area is involved.

That is almost like comparing circles by Pi, with no regard for the radius involved. It doesn't tell you anything about the actual circumference or area.
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Old 08-30-2011, 11:06 PM   #4
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Originally Posted by HipToBeSquare View Post
Education is evidently more lacking than I thought.

A coefficient is not a final measurement.

A coefficient is a multiplier for another factor, in this case total frontal area, to come up with a final measure of aerodynamic drag.

Merely having the same multiplier says nothing about how much frontal area is involved.

That is almost like comparing circles by Pi, with no regard for the radius involved. It doesn't tell you anything about the actual circumference or area.
....aaaaannnnd theeeennn?
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Old 08-30-2011, 11:10 PM   #5
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Feel free to add if you think there is more to be said.
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Old 08-30-2011, 11:57 PM   #6
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And the just released Camry is a 0.27 Cd. Sonata is 0.28 on the standard model and 0.25 on the hybrid. Why is there a news article about this?
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Old 08-31-2011, 01:46 AM   #7
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GM has to say something to try and sell Malibu somehow.
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Old 08-31-2011, 10:34 AM   #8
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Quote:
Originally Posted by HipToBeSquare View Post
Education is evidently more lacking than I thought.

A coefficient is not a final measurement.

A coefficient is a multiplier for another factor, in this case total frontal area, to come up with a final measure of aerodynamic drag.

Merely having the same multiplier says nothing about how much frontal area is involved.

That is almost like comparing circles by Pi, with no regard for the radius involved. It doesn't tell you anything about the actual circumference or area.
This man is correct.

The true comparison is Cd * A.

Playing Cd pissing contests goes right up there with other such meaningless gems as HP/L, HP/lb, and "1 pound of rotational mass is equal to 4 pounds of weight".
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Old 08-31-2011, 01:13 PM   #9
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And the just released Camry is a 0.27 Cd. Sonata is 0.28 on the standard model and 0.25 on the hybrid. Why is there a news article about this?
Because the copy writers at GM have to do something.

.25 for the Sonata Hybrid, huh? That's impressive, matching the camback Prius.
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Old 09-01-2011, 01:48 AM   #10
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I dont get how the numbers are even remotely impressive on the "new" malibu and "mild-hybrid".

My dad drives a 2009 4cyl 6A and I saw him on the east coast last week where he drove halfway across the country....getting 37-38 mpg the whole way.
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Old 09-01-2011, 02:25 AM   #11
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My dad drives a 2009 4cyl 6A and I saw him on the east coast last week where he drove halfway across the country....getting 37-38 mpg the whole way.
What is a 6A?
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Old 09-01-2011, 02:34 AM   #12
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Originally Posted by HipToBeSquare View Post
GM has to say something to try and sell Malibu somehow.
Pretty sure it's a steaming pile still.
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Old 09-01-2011, 02:48 AM   #13
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Originally Posted by HipToBeSquare View Post
Education is evidently more lacking than I thought.

A coefficient is not a final measurement.

A coefficient is a multiplier for another factor, in this case total frontal area, to come up with a final measure of aerodynamic drag.

Merely having the same multiplier says nothing about how much frontal area is involved.

That is almost like comparing circles by Pi, with no regard for the radius involved. It doesn't tell you anything about the actual circumference or area.
You forgot to provide examples Hip2b. Like the Legacy, Malibu, and then use something with a small frontal area but worse drag coefficient to compare.

Or if you're feeling lazy I can just link to the Automobile drag coefficient wiki.
Oops
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Old 09-01-2011, 03:35 AM   #14
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Feel free to post all of the examples you wish. The definition of what a coefficient always is, remains the same.
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Old 09-01-2011, 04:53 AM   #15
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I think the point is that we can come up with a reasonable estimate of the frontal area from the vehicle's dimensions, but not the cd.

With your pi example it's more along the lines of comparing circles by pi, if pi were variable and you had a ruler to measure the diameter.
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Old 09-01-2011, 12:00 PM   #16
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Coefficient(0.???) x Frontal area(width x height x 0.83) = drag area

Any questions for our 'glorious' teacher, Hip2b?
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Old 09-01-2011, 01:54 PM   #17
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Originally Posted by Calamity Jesus View Post
What is a 6A?
I'm assuming he means a 6-spd auto...
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Old 09-01-2011, 02:56 PM   #18
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Originally Posted by Allch Chcar View Post
Coefficient(0.???) x Frontal area(width x height x 0.83) = drag area

Any questions for our 'glorious' teacher, Hip2b?
I am not sure what you are arguing about. You are re-stating what I already did.

Without frontal area as a context, the comparison of saying a Malibu cuts through the air like a Corvette, is bollocks, based only on a coefficient.

They didn't publish drag area or frontal area for either car, they solely compared coefficients.

And for being picky about this stuff, you don't identify your 0.83 constant. Is it to reduce the frontal area due to ride height? that would not be a constant, but a measurement variable.
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Old 09-01-2011, 09:03 PM   #19
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I'm assuming he means a 6-spd auto...
yup, 6 speed auto non-CVT.
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Old 09-01-2011, 09:23 PM   #20
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yup, 6 speed auto non-CVT.
There really isn't such a thing as a 6 speed CVT. Some CVTs have ratios that they will hold during acceleration (to act more like a traditional AT due to consumer preference) or when you are in a sport mode, but it really has as many gears as the precision of the oil piston that controls the cone position.

/nitpick
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Old 09-01-2011, 09:36 PM   #21
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Nearly 20 years after the Audi 100 (5000) achieved 0.30 Cd, Chevy is bragging about this? Sheesh!
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Old 09-02-2011, 01:14 PM   #22
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Nearly 20 years after the Audi 100 (5000) achieved 0.30 Cd, Chevy is bragging about this? Sheesh!
lots of human babies are able to walk by 1 yr old but all the moms still brag about it when their toddlers start walking....
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Old 09-02-2011, 06:15 PM   #23
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I'm not digging the styling, it looks like a 2011 Celebrity:



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Old 09-02-2011, 06:34 PM   #24
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That's impressive, matching the camback Prius.
That's kammback, not camback. It's worth getting right because it's actually named after someone, and his last name was not Cam.
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Old 09-02-2011, 10:02 PM   #25
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I'm not digging the styling, it looks like a 2011 Celebrity:



Yep. They both have four wheels, four doors, headlights and taillights. Exactly the same.
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