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  1. #1
    Gone but not forgotten Remo's Avatar
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    Default C5 vs. C6 Aerodynamics

    Last year when I was at the annual Corvettes @ Carlisle event, I was chatting with the Corvette Engineers in the GM tent. I asked them if the drag coefficient of the C6 was better than the C5. Their answer went something like this. "We've been very pleased with the wind tunnel results and the C6 is an extremely aerodynamic vehicle". I smiled, they smiled and I left it at that. However, I was pretty sure what the real answer was. Especially when one considers the more radical windshield rake on the C5.

    "Well as I live and breath." Yesterday I got this months addition of Corvette Fever which included an article titled Areo Evolution. Essentialy a test of the drag coefficients of C1's right through to the C6's. As you might expect ,the body design wind tunnel results got better through the years. That is until you get to the C6. It turns out the C5 is actually a little slippier than the C6. Less drag, more down force and less lift. Now to be honest the C5 drag coefficients fall below the C6 when the headlights are open. I'll keep that in mind the next time I'm in a top end race with a C6 after dark.

    Consider if you will....the aerodynamics of a C5 convertible, dropped two full inches closer to the ground, with the top down....OMG!
    Remo

  2. #2
    C5 vs. C6 Aerodynamics Patrick's Avatar
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    Remo,
    Winter is over. You can stop stirring the pot as your form of hibernation recreation now.

  3. #3
    Gone but not forgotten Remo's Avatar
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    Default An Innocent Post

    Quote Originally Posted by Patrick View Post
    Remo,
    Winter is over. You can stop stirring the pot as your form of hibernation recreation now.
    Oh please.....if I wanted to stir the pot, I would have posted this in the C6 section. I just wanted to make the C5 guys feel good about themselves. And they should because they're beautiful people.
    Remo

    2001 Quicksilver Lingenfelter Vert. 6 Spd, PFADT Coilovers & Sways, Kooks
    LT Headers, high flow cats, X-pipe, Borla Stingers - 469 RWHP, 455 RWTQ.

  4. #4
    Gone but not forgotten XLR8's Avatar
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    Default

    Quote Originally Posted by Remo View Post
    Oh please.....if I wanted to stir the pot, I would have posted this in the C6 section.....
    Touchť

    Quote Originally Posted by Remo
    I just wanted to make the C5 guys feel good about themselves. And they should because they're beautiful people.
    Remo
    Ain't it the truth.

  5. #5
    C5 vs. C6 Aerodynamics vett boy's Avatar
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    I feel that the C5 is a sleeker looking car.Lots of pluses to a C6 but surprisingly they come with some negatives .At times I really miss my C5

  6. #6
    C5 vs. C6 Aerodynamics Patrick's Avatar
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    Default

    Quote Originally Posted by Remo View Post
    Oh please.....if I wanted to stir the pot, I would have posted this in the C6 section. I just wanted to make the C5 guys feel good about themselves. And they should because they're beautiful people.
    Remo
    You don't think C6 owners stop by here?

    But you're right, Remo. You are a beautiful person. Would you like a hug for Spring?

  7. #7
    Member jrose7004's Avatar
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    That's good because I still like the C5 better anyway!

  8. #8
    C5 vs. C6 Aerodynamics vett boy's Avatar
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    Default

    Quote Originally Posted by Patrick View Post
    You don't think C6 owners stop by here?


    I'll just sneak back out ,even though my C6 is silver.

  9. #9
    Member Gorgon's Avatar
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    Quote Originally Posted by Remo View Post
    It turns out the C5 is actually a little slippier than the C6. Less drag, more down force and less lift.
    Those are mutually exclusive. You can't have more down force with less drag, which is likely why the C6 has a higher Cd since it would need higher down force for the higher top speed.

    Quote Originally Posted by Remo View Post
    Now to be honest the C5 drag coefficients fall below the C6 when the headlights are open. I'll keep that in mind the next time I'm in a top end race with a C6 after dark.
    You wouldn't run top speed with those crappy C5 headlights even if the C6 wasn't there. You can outrun the C5 headlights in 3rd gear.

    But either way, all the data I looked through online actually had the C6 with a better Cd; 0.28 versus 0.29 on the C5. They might have been looking at drag area which is a combination of the drag coefficient times the frontal area. I don't have those numbers and the C5 likely has an advantage there. But I can't believe it's worth writing home about.

  10. #10
    Gone but not forgotten Remo's Avatar
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    Default And The Point Is

    Quote Originally Posted by Gorgon View Post
    But either way, all the data I looked through online actually had the C6 with a better Cd; 0.28 versus 0.29 on the C5. They might have been looking at drag area which is a combination of the drag coefficient times the frontal area. I don't have those numbers and the C5 likely has an advantage there. But I can't believe it's worth writing home about.
    Leon...nice to hear from you. the CD numbers in the Corvette Fever testing on the baseline coupes were: C5=.334, C6=.343. In terms of drag they measured how much HP it took to reach 100 MPH. The numbers were: C5=128.6, C6=133.0.

    Now you may be right regarding this being worth writing home about. But, my point was centered around the conversation I had with the Corvette engineers last August. They knew what the real story was but chose instead, to give me a very corporate response.
    Remo

  11. #11
    C5 vs. C6 Aerodynamics 6 Shooter's Avatar
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    Default Gordon - Your information is correct, ...

    Quote Originally Posted by Gorgon View Post
    But either way, all the data I looked through on-line actually had the C6 with a better Cd; 0.28 versus 0.29 on the C5.
    ...C6's have a lower Coefficient of Drag than C5's and a coupe has a lower Coefficient of Drag than a vert even it the vert has it's top down, due to turbulence!

    L8TR - D

  12. #12
    Gone but not forgotten Remo's Avatar
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    Default Your Data Base vs. Mine

    Quote Originally Posted by 6 Shooter View Post
    ...C6's have a lower Coefficient of Drag than C5's and a coupe has a lower Coefficient of Drag than a vert even it the vert has it's top down, due to turbulence!


    L8TR - D
    Terrific input from Senator Fenton from the great state of confusion...I mean Missouri. Here's the deal, I'm looking at the data in the May issue of Corvette Fever and coupling that with the evasive answer I got from the Corvette Engineers. So one might say if it walks like a duck and .........

    As far as my comment about the convertible...that was intended to get Patrick out of the weeds and it worked perfectly.
    Remo

  13. #13
    Member zagger's Avatar
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    Default

    Every one knows that the C6 was freshly waxed for the test and they drove the C5 to the test site through dusty back roads. The actual difference is much grater than the skewed numbers show, typical GM conspiracy! And for those who think it's all a hog wash you obviously did not read the Mothers vs. McGuire wax wind tunnel test results.

  14. #14
    Member Cruzen's Avatar
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    Default

    Quote Originally Posted by Gorgon View Post
    Those are mutually exclusive. You can't have more down force with less drag, which is likely why the C6 has a higher Cd since it would need higher down force for the higher top speed..
    IMHO More downforce is not revelent to more speed. The more important number is the less lift. Corvettes have been notorious for uplift.

    Anyone who has had a C2 up over 110 can tell you about this. Between 110 and about 115 the uplift on my C2 was so bad that it seemed the steering stoped functioning. I could move the steering wheeel about 10 degrees off center without changing course. I have heard that the C3 was worse but never owned one so I don't know from experience.

    The C5 has less drag than the C6, but the REAR of the C6 has more downforce which improves cornering at speeds over 100 or so when this downforce comes into play. For most parking lot jockies who participate in timed events, the slight difference won't come into play because they never get up to that speed.

    The fact of the matter is that most people driving a Vette never get into triple digets speeds so the drag only comes into consideration on their MPG figures.

    The trip is short,
    enjoy the ride.
    Denny

  15. #15
    C5 vs. C6 Aerodynamics vett boy's Avatar
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    Default

    Quote Originally Posted by Cruzen View Post

    The fact of the matter is that most people driving a Vette never get into triple digets speeds so the drag only comes into consideration on their MPG figures.

    The trip is short,
    enjoy the ride.
    Denny
    Exactly

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