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Old 07-14-2008, 02:24 PM   #1
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Default Looking for pics of real aero parts

So I've built a pretty hefty air dam and cut out my back bumper in the name of aero. Pulled an average gain of 3 mpg so it is effective, but its not done.

I'm looking for pics of NA's with effective aero mods. None of the "Oh I have a race car" ricer ****, but real effective parts. Particularly air dams (mine's not quite done) and rear diffusers. Not looking for downforce yet, just a reduction in drag.
--Alex
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Old 07-14-2008, 04:13 PM   #2
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I can't speak to the effectiveness of these, but I saved them because they looked like good parts to copy myself.

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I have seen diffusers on CR, but I have no idea if they work. I doubt I will ever make one, so I haven't searched very hard for real miata race cars with them.
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Old 07-14-2008, 04:20 PM   #3
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For the rear, just do what stealth did...it seems to work well.
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Old 07-14-2008, 04:37 PM   #4
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all those posted are for increased down force, not the removal of drag.


things like front chin spoilers, undertrays, skirts, difusers, etc etc, would be to help reduce drag...thus is increase in MPG not decrease










i believe this is what he wants to see..
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Old 07-14-2008, 05:35 PM   #5
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Quote:
Originally Posted by miataspeed1point6 View Post
I can't speak to the effectiveness of these, but I saved them because they looked like good parts to copy myself.

In this first pic, you can't really see much because there's a blue Miata in the way.
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Old 07-14-2008, 05:38 PM   #6
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that blue car is very good for round-eye. I need that bumper.
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Old 07-14-2008, 05:38 PM   #7
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actually the lips (horizontal -- ) and air dams (vertical | ) do a very similar job. they keep air from going down under the nose of the car. that helps both keep air out from under the car where **** is fugly aerodynamically and also creates a low pressure region under the car that helps improve pressure differential across fun parts like the radiator.

air holes in the rear bumper are for a similar reason.

diffusers are more for downforce. they "spread out" so that the air also spreads out (rarifies), speeds up, and creates a low pressure region. if you have low pressure under something and high pressure (or atmospheric) above it, guess what you get? downforce.

so if you imagine a giant wing... flip it ,,umop apisdn,, and put four wheels on it... you have a race car. smooth underside that rises at the back.
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Old 07-14-2008, 05:59 PM   #8
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Sweet. Thanks for the pics. Any more of the white car a little closer?

My air dam is a Track Dog knock off really, but I haven't decided how to finish the ends and incorporate the splitter. I like the idea of doing the nose and front undertray in one piece. I am a bit concerned with blocking off the bottom of the engine compartment without a way to vent heat properly. I'll probably have to go with a vented hood.

While I agree that usually the purpose of diffuses is fo downforce, they also do a nice job of releasing the underside air back to ambient thereby reducing drag. That and I don't like the drilled bumpers. A bit too much rice / drift for me. Basically on mine I took a template for a FM dual exhaust, cut out the secong hole and connected them. Its really quite subtle due to the height of the car. Now I just need to transition that cutout into the underbody of the car. So while it may not be a true diffuser, it should help put the air back nicely.
--Alex
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Old 07-14-2008, 06:31 PM   #9
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Quote:
Originally Posted by AlexO35 View Post
Sweet. Thanks for the pics. Any more of the white car a little closer?

While I agree that usually the purpose of diffuses is fo downforce, they also do a nice job of releasing the underside air back to ambient thereby reducing drag. That and I don't like the drilled bumpers. A bit too much rice / drift for me. Basically on mine I took a template for a FM dual exhaust, cut out the secong hole and connected them. Its really quite subtle due to the height of the car. Now I just need to transition that cutout into the underbody of the car. So while it may not be a true diffuser, it should help put the air back nicely.
--Alex
I'll link you to my random miata picture gallery. Lots of random aero/motor etc.. stuff.
http://s295.photobucket.com/albums/m...ta%20Pictures/

The white car is actually light blue i think, here is a closer shot of that fender mod
ie:
More of that rear bumper style here.



I think we are mixing up "difusers" here also. The red car up above with the "drilled bumper" is mine. The piece used is mainly designed for drag cars to trim what is normally either a missing bumper or a severly hacked one. It's main purpose is to allow air to flow through instead of getting caught.

It's aero effect is quite different from an underbody/aero difuser. Which will flow the air more effectively and block that entire area off. Thus allowing the air to be shaped in a way that speeds flow (as mentioned above) and creates downforce.
ie:

My use is neither ricey or ******* btw... its a track car (I'm fairly sure you weren't 'picking' on it... but anyways)
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Old 07-14-2008, 07:27 PM   #10
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LMAONADE


Are those Wrangler hood toggles?
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Old 07-14-2008, 07:49 PM   #11
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That blue car would look nice if it didn't have that super gay sticker and round hook type of thingy just hanging there randomly.
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Old 07-14-2008, 08:03 PM   #12
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Quote:
Originally Posted by Splitime View Post
I think we are mixing up "difusers" here also. The red car up above with the "drilled bumper" is mine. The piece used is mainly designed for drag cars to trim what is normally either a missing bumper or a severly hacked one. It's main purpose is to allow air to flow through instead of getting caught.




Do you have any test data?
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Old 07-14-2008, 08:07 PM   #13
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Quote:
Originally Posted by Zabac View Post
That blue car would look nice if it didn't have that super gay sticker and round hook type of thingy just hanging there randomly.


It's a tow hook, that car looks to have a full cage so it probably competes wheel to wheel. Tow hooks are required for wheel to wheel racing, sure it could be placed in a more pleasing manner, but it looks 100% as functional as the rollcage.
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Old 07-14-2008, 08:21 PM   #14
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Quote:
Originally Posted by Braineack View Post
All those posted are for increased down force, not the removal of drag. I believe this is what he wants to see..
Oops.
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Old 07-14-2008, 08:35 PM   #15
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Quote:
Originally Posted by Joe Perez View Post
In this first pic, you can't really see much because there's a blue Miata in the way.

You're right, looks like there is a Ford RS200 in the background.
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Old 07-14-2008, 09:02 PM   #16
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Quote:
Originally Posted by The_Pipefather View Post
You're right, looks like there is a Ford RS200 in the background.



That is NOT a RS200. It looks more like one of those jdm body kit miatas, probably pitcrew.
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Old 07-14-2008, 10:37 PM   #17
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Quote:
Originally Posted by BenR View Post
Do you have any test data?
Not going to do the homework for you. You'll see how the underbody panels differ in use vs simple bumper opening aero.

And that ugly thing is most definitly some nasty jdm bodykitted miata.
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Old 07-14-2008, 11:07 PM   #18
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There is some pretty good reading in "Racecar Engineering". I don't have the links to the articles anymore though. It gives a pretty good run down of diffusers. The aero holes are just common sense. They've been doing that on race cars for years. Take a look at the back bumper sometime. Sits there like a big old parachute air brake.

Splitime: Thanks for the link. Whole crap load of pics to go through. You're right, wasn't picking on your car with the ricey bumper hole crack. I've just been tainted by Hondas doing it for the "look". Well, one particular Honda that I can't stand actually. For a track car though, I get it.

What is the purpose of the fender mod on the white car?
--Alex
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Old 07-14-2008, 11:10 PM   #19
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I think it's an re-amemiya car
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Old 07-14-2008, 11:11 PM   #20
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Where can I get a working wing like the one on the blue car in the post by miataspeed1point6?
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