ok, heres the purpose:
i would like to talk out what can be done: starting with the small bits
i would like to discuss the aero profile of the cars. CD is.. too basic. for good aero, airflow over the hood/roof and under the car needs to be figured out. ie: does it stay attached to the car?
i would also like to discuss more technical aspects like extracting air from the engine bay and rejoining the air under the car with ambient.

my ideas for the front section of the car:
-a belly pan that goes from the radiator core to the firewall
- hood vents on the front third of the hood to draw out air brought in for cooling. i would like to use the cowl hood to do as such but the air decelerating on the windshield might not allow that.
- an air dam that brings in air for the radiator from the center but also deflects air not used for the radiator to either side of the front tires.

for the underside of the center of the car:

-with box tubing sfc's, one could fairly easily create a flat bottom on either side of the DS tunnel to the control arm mounts.

i have not yet come up with any ideas for the ds tunnel or differential.

for the rear:

- one could possibly get air to a functional and usable diffuser. the biggest issue there is again.. the differential. of course, the idea is to get the air to expand as it exits and to merge with the ambient air at 0 velocity.

so... discuss! racecar engineering magazine was a useful resource for the vaporware thread. this is to discuss not just the science but the methods and materials to use.

 

First, why don't you test what the air is doing on the car as it is. This will give you an idea of the real world aerodynamics.

The basic test is fairly simple. Where ever you want to see which direction the air is traveling, i.e. the air flowing across the top of the hood, tape a 3"-4" piece of string in various spots along the hood. Take it for a drive, and note the direction that the string is pointing at different speeds. Same goes for the windshield, rear hatch, etc. Have a friend ride with you and video tape the strings in each location while you call out your speed. for the hard to reach areas under the hood and the bottom of the car a Go Pro camera would be perfect.

This is essentially the same as wind tunnel testing with smoke except you cant see turbulence. Low pressure areas will have a "lazy" string that floats around in multiple directions "casually". High pressure areas will have a "stiff" string that will usually point in the same direction at a coinciding speed.

This will give you a basic idea of what the air is doing before you make any changes.

 

Im curious to see where this thread goes, its been discussed before and I havent really seen much. I'm still not at that point yet in my build, but I'm getting antsy.

It doesnt seem like theres anything that cant really be done about the rear end and DS tunnel. With a live axle, DS, and tourqe arm costantly in motion its almost impossible without it dragging on the ground. A belly pan could probably be made to a little bit past the tailshaft but thats about it in my eyes.

Of course theres all of our dreams of swapping in a C4 IRS, with a fixed diff that opens up alot of possibilities.

 

that is part of the plan, eventually.

there are points that are obvious: disturbed airflow underneath because of the uneven bottom, suspension, and differential. a hard top will undoubtedly be better off than a t-top. lastly, the engine bay. air can get in but not out

a not so obvious point is the cowl area. there is some question because of the 'well' where the windshield wiper drive gear is and it being a water drain. the question is: does that well diminish the high pressure area that is present against most windshields (dependent on windshield slope).


..oh to have something that could do cfd..

 

there are ways to deal with the d/s tunnel but it will become a compromise.

the compromise would be (to me) to attach a belly pan to a set of sfc's on either side of the d/s tunnel. would have to direct airflow around the tunnel from the front as best as possible. the hard part is getting it out the back and get it to ambient air speed/close to zero. the idea is to create a low pressure area right past the bumper that the high pressure air underneath rushes to balance out. again, difficult to do with the setup we have but i do think it can be done to some extent.

 

For anyone curious about the taping strings method anobii suggested, you can see example of it in this video
http://www.streetfire.net/video/team-schrick-episode-1-english-subs_681201.htmIt´s at 21 minute mark.

If anyone does take video of this on camaro body, please post them, would be interesting to see them.