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Old 11-28-2009, 01:17 AM   #11 (permalink)
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supersupereight -

Welcome to EM! In Frank and Christ you can trust.

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Old 11-28-2009, 01:19 AM   #12 (permalink)
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Quote:
Originally Posted by supersupereight View Post
Thanks for the welcome..!

Top speed is achived in 5th gear at redline. 6th gear is strictly an overdrive gear for fuel economy. It works great! I also skip shift 1-3-5 or 1-3-4-6 often which helps.

Yea your buddy drove you down in a C4..Cd was probably.34
My C5 has a Cd of .29
When you say New Vette..Do you mean C6?? with the lowest Cd of all corvettes at .28
.
No, a new in 86. so it was the C4. but what a change from the 79 RX7s we were racing!!!! the phrase 'ricer' suddenly had real meaning!

of course I was in a 66 mustang 200in auto trans, 2.89 rear end before the rx7!!!!

You certainly are bring a 'full deck' to the table, you've really thought the modds out.
If you start to dig deep here you'll see that there is certainly some top talent on the aero front!
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Old 11-28-2009, 01:46 AM   #13 (permalink)
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supersupereight -

I think you already have a rear slope that closely matches the image you provided :



Maybe one of them salt-flat flat-spoilers would do something :



I *do* like the adjustable spoiler part for finding your Vette's sweet spot.

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Old 11-28-2009, 01:55 AM   #14 (permalink)
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A tuft test would reveal if there is a need for mods in that region.
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Old 11-28-2009, 01:56 AM   #15 (permalink)
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A tuft test would reveal if there is a need for mods in that region.
And stifle any possibility for debate.
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Old 11-28-2009, 02:02 AM   #16 (permalink)
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I'm going to go all out and suggest boat tailing the wheel fairings in the rear bumper and rocker panels. They're already tailed up on both parts, but (especially in the rear) more could be done.

I'm also going to note that because of the rear design of the car, if anything were to help rear flow off the tail, it would likely be a spoiler-like device mounted at the base of the windshield, probably no more than 1" from the deck lid to promote linearity through the course of the roof to decklid transition. A rigid decklid extension would clean up the detachment point considerably, if you're seeing dirt devils in the tail lights.

Under the rear bumper, the curve transitions to a fairly sharp rounded edge... usually, a square edge would be of benefit, although increasing wake area, it will separate flow more cleanly, inducing less of a vacuum... A rear valance splitter-type spoiler might be effective at that aft curve.

Those are about the only rear-end suggestions I have, other than whale-tail tapering.

EDIT: After further consideration, I can almost guarantee your tail lights are getting dirt devils at their tops, and it's because of the low-speed flow profile at the bottom of the rear bumper. If you straighten out that aft edge, your license plate and lights should stay almost 100% cleaner.
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Old 11-28-2009, 02:10 AM   #17 (permalink)
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wat?

There's gonna be dirt devils on the taillights no matter what mods happen back there except for a full boattail that covers em up.
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Old 11-28-2009, 02:12 AM   #18 (permalink)
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Welcome to the site!!!

I always love the idea of making a Corvette a eco-car.
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Old 11-28-2009, 02:17 AM   #19 (permalink)
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Can you please not make it an Eco car? lol They have LS1's for a reason. :P

Do you still have the runflats on it? When you get new tires, replace the runflats with regular tires. Everything will improve.
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Old 11-28-2009, 02:27 AM   #20 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
wat?

There's gonna be dirt devils on the taillights no matter what mods happen back there except for a full boattail that covers em up.
There will be, of course, but the impression I got was that he has to regularly clean his tail lights because of them... improving rear airflow will help that situation.

The idea (for those that don't know) is that solid masses traveling in an air stream will move to the outside edge of the stream.. (centripetal force), and tend to attach to solid-non moving objects, like your car, where they can adhere. Moving the largest section of the turbulent wake further from your vehicle means that less of the particles get trapped close enough to your vehicle to adhere, so you get less dirt devils in the lenses.

It's kinda like how those stupid SUV window spoilers work, only in reverse, I guess.

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