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 8th Gen Riviera Aerodynamics

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Buapo
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PostSubject: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyWed Feb 11, 2009 6:09 pm

Holy crap, I just did a quick search and I came up with this:

http://en.wikipedia.org/wiki/Automobile_drag_coefficients

And there is the 1995 Riviera, right on this list. Riv's got a .32 drag coefficient! I see that the GM EV1 had one of the best drag coefficients of any production car, according to this list.
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Jack the R
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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyWed Feb 11, 2009 8:53 pm

That list has got to be bullshit. How the hell does a RAV 4 or Scion xB have less drag than a Riv?
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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyWed Feb 11, 2009 9:05 pm

Jack the R wrote:
That list has got to be bullshit. How the hell does a RAV 4 or Scion xB have less drag than a Riv?

Much of what determines Cd is upright surfaces on the front of the car. HEadlights, grille, air dam contribute to raising Cd.

Much of what determines CdA is frontal area. Park next to an xB or a RAV4 and if you can look at them side by side straight on from the front u will almost immediately notice the difference of frontal area.

SO the Riv can have a lower Cd, but if A is substantially greater than some other car with a worse Cd then the Riv will have more drag in motion, and take more energy to move at a given speed.

Albertj
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Jack the R
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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyThu Feb 12, 2009 3:27 pm

That sounds like the Riv should have a lower Cd or CdA than the xB and RAV 4, not higher.

The chart with the Riv on it shoes Cd, not CdA.
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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyThu Feb 12, 2009 3:41 pm

You can't really tell Cd by looking a car. The first gen Lexus LS sedan had a phenomenal .29 Cd, but you couldn't tell by looking at it:

8th Gen Riviera Aerodynamics 100_7908

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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyFri Feb 13, 2009 2:28 am

Albertj,
I just looked closely at that list again, and the figures Jack the R are referring to are the actual Cd numbers, NOT the combined Cd and area numbers. And I had a similar reaction as Jack did - - How the f**k can those little boxy things have a better Cd than a Gen-8 Riviera? Unless they have REALLY smooth underbellies. (?) I know a full "belly pan" can dramatically cut drag - - it's an old trick at the salt flats (and illegal in most divisions, too!!!!) Does anyone know if that's the case? Because if it's not, I don't get it, either. Another place to make a big difference could be wheelwell design. If they incorporated some modern "trick" there that the Rivi didn't, then - - - - -
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Jack the R
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PostSubject: Re: 8th Gen Riviera Aerodynamics   8th Gen Riviera Aerodynamics EmptyFri Feb 13, 2009 12:06 pm

The RAV 4 is a jacked up Camry or Corolla, isn't it? IIRC you can see the a-arms hanging reaching down at a ridiculous angle. Plus its got that crossover ride height letting tons of air under the car.
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