Making A Rear Diffuser.. [Archive] - MX5 Miata Atlanta Owners Club

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simontibbett
12-23-2008, 02:20 PM
So I am working on a rear diffuser, I posted some info on it in my build thread, but to recap:

-Metal (the larke flat piece)
-Ferrari F430 Challenge fins (I add what they are off of so you can see the shape they aren't perfectly triangular)
-Small nub fins like you see on an EVO's roof.

Anyway, the metal goes almost halfway under the car, one of the problems I see is the air above the diffuser that gets trapped, the only way I see getting it out is either A. making a solid flat bottom, or B. slitting the rear bumper right above the exit of the diffuser.

No I am not a pro in aerodynamics, but I have been doing a LOT of research and things, and I love to experiment and try stuff. Attached is a pic describing what I am talking about, and a pic of an F430 fin. Mainly for the F430 fin note it is really smooth and flowing, and travels really far back (towards the front of the car)

MeFryRice
12-23-2008, 02:22 PM
I want to say I've seen someone with a diffusor on the back of an NA on CR.net but I may be wrong. I'll try to dig up the pic for you.

simontibbett
12-23-2008, 02:25 PM
Ok cool, I have seen a few really nice ones, I keep getting ideas off other cars, but don't have the money to make a really nice carbon fiber one or something like that, it may help a tad it may not, nothing to lose in trying! :)

metalman
12-23-2008, 04:45 PM
Moti and Blackbird

http://www.miata.net/motm/2005/images/moti5.jpg

http://www.miata.net/motm/2005/images/moti7.jpg

metalman
12-23-2008, 04:58 PM
More...

http://joyfast.com/shop/democar/4b.jpg

http://www.vary.co.jp/wd/nb_ru/3b.jpg

http://forum.miata.net/vb/attachment.php?attachmentid=61391

http://forum.miata.net/vb/attachment.php?attachmentid=32298

More related...

http://www.fd3s.net/diffuser/index.html

simontibbett
12-23-2008, 05:04 PM
Woooowwwwww nice links!!!! THANKS!!

metalman
12-23-2008, 05:05 PM
And yet more....

http://forum.miata.net/vb/attachment.php?attachmentid=49113

http://forum.miata.net/vb/attachment.php?attachmentid=49115

http://forum.miata.net/vb/attachment.php?attachmentid=58546

http://forum.miata.net/vb/attachment.php?attachmentid=58547

That should keep you busy awhile.