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Old 01-24-2015, 02:06 PM   #1 (permalink)
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Corvette in GM's tunnel

Here is a link to a video of a Corvette under smoke at the Warren,Michigan big-boy tunnel
[VIDEO] LMR Tests Their Texas Mile Twin Turbo Corvette in GM’s Wind Tunnel

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Old 01-25-2015, 07:03 PM   #2 (permalink)
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I went searching for more information on this car, trying to find if LMR ever made good on their promise to produce aeromods for the C6. It looks like they didn't, but I did find a more in-depth article on the car and windtunnel. The captions to the pictures give the most information, including the following:

-"The first mod was to seal off openings in the grille, splitter, and fascia.... This is standard practice in top-speed competition and took a solid 18 counts off the drag coefficient."

-"LMR co-owner, Josh Ledford, crafted up some low-tech wheel discs to flush-cover the 19-inch rims, front and rear. We kinda thought this would be a big step and it was, immediately taking off 12 counts of drag while (or perhaps by) reducing overall downforce."

-"The outside mirrors were then folded in from their normal position seen here. This proved aerodynamically effective."

-"Tom Froling then suggested altering the carís rake by lowering the nose somewhat. Rather than mess with suspension adjustments (nearly impossible with the car on the platform) the crew simply added sufficient ballast weight under the hood and in the cabin footwells to drop the nose by about 12mm. The effect was rather dramatic, lowering drag by 8 counts, and benefiting downforce to the point where the overall lift coefficient was down to 0.001."

-"By now, we were running out of time, so for one final Hail Mary it was decided to extend the baseplate of the front splitter (by about 1.5 inches at the center and tapering back towards the outer corners). By altering the carís front/rear aero balance, this proved very effective, taking another 4 counts off drag."

End result: .373 down to .307.



I'll post this in the Crossfire thread, too, as they may be interested in it.
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Old 01-25-2015, 09:46 PM   #3 (permalink)
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I know that there is an optimal angle go a front end. Just look at the low rack on the new Mercedes. The front hoofs really are slanted down. When I lowered the front end on the 02 Q45, my highway mpg improved.
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ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 01-27-2015, 05:19 PM   #4 (permalink)
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C6 mirrors (10% of drag ?)

I took everything accounted for in the article and solved for the mirror drag,since it wasn't given.I came up with delta-0.034 ( 10% increase ).
This agrees very well with what the 'Spirit of EcoModder.com' mirrors indicated.
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Old 01-27-2015, 09:28 PM   #5 (permalink)
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there was so much 'money' left on the table at the back. Why not tail that thing properly?
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Old 01-28-2015, 02:23 PM   #6 (permalink)
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It's amazing that the taping of the body work seams and the small hood duct resulted in a reduction of 18 counts of drag. Looks like I'll be pulling out the painters tape when I get home.
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Old 01-28-2015, 05:51 PM   #7 (permalink)
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Quote:
Originally Posted by aeroboy View Post
It's amazing that the taping of the body work seams and the small hood duct resulted in a reduction of 18 counts of drag. Looks like I'll be pulling out the painters tape when I get home.

"The first mod was to seal off openings in the grille, splitter, and fascia....


Meaning they sealed off the front end. Taping the body seams has little effect on drag in modern cars

Check out this link and follow it halfway down.

http://www.hotrod.com/how-to/paint-b...-aerodynamics/

You will find this comment :

" Taping seams: Rarely if ever are body-panel seams so large and misaligned that smoothing them with duct tape will make a measurable difference in Cd. We tried it on our Camaro, and it did nothing. "

This was on a 1980 Camaro with body seams big enough to walk through.

Read more: Car Aerodynamics - Hot Rod Magazine
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