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BMW 3-Series (E90 E92) Forum > E90/E92/E93 Marketplace (For Sale / Trade / Wanted) > SPONSORS Classifieds/Groupbuys/Specials Area > Functional Underbody Diffuser Add-On



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      06-17-2013, 10:22 AM   #1
Andy M
 
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Functional Underbody Diffuser Add-On

This project started back in 2011 with the ambition to make a full functional diffuser. Unfortunately I found that getting wind tunnel time for my car was going to be a BIT pricey. So instead I decided to design it with less emphasis on the downforce aspect but rather channelizing the air in the back of the vehicle instead of having the air trapped inside the rear bumper cavity.

After a lot of work and input from local BMW enthusiasts here in Toronto, I finally came up with a design and brought it to production. I realized that even though I may have improved the airflow of my car slightly, the byproduct was a diffuser that looked really good and made the BMW's look a lot more aggressive while still maintaining the classiness of the BMW badge.

FUNCTION: closes off the cavity at the rear of the vehicle between the muffler and rear bumper, channelizes air to improve airflow at the back. (NOT tested in an air tunnel yet so I don't have any statistics but theoretically from an engineering design perspective this will improve the aerodynamics).

MATERIAL:
7075-T6 Aluminum and Carbon Fiber (two design styles - aluminum only version is a different style from the Carbon Fiber and Aluminum version).

INSTALLATION TIME: ~2 to 5 mins. This diffuser is designed to be used on the existing bolt holes at the bumper so NO DRILLING is require.

FITMENT:
(updated as of 06-08-2013)
Confirmed fitments:
ALL E90's (323, 325, 328, 330, 335) for pre-LCI and LCI models with and without mtech
ALL 335 configurations (E90, E92, E93)


This includes mtech and non-mtech. The fins are adjustable so it can adapt to different cosmetic mods.

DOES NOT fit: 1 series, F30, E92 328, E93 328

The E92 328 has a different configuration from the rest. So it's a little weird. Of course, if you're ok with drilling holes in the bumper then it probably will work.

F30 is an easy transition so expect that to come out soon.


COST: $295.00 for Carbon Fiber, $175.00 for Aluminum only

Ships pre-assembled from Toronto, Canada.

PICTURES:









The FIRST production batch of diffusers consist of 10 carbon fiber versions (designed for m-tech bumpers), and 5 aluminum-only versions (designed for non-mtech). Obviously the first production version is mounted on my car so now we only have 4 CF versions and 5 aluminum versions left.

INTRODUCTORY OFFER: 10% off.


Edit: more photos of installed on customer cars

E90 335 LCI non-mtech (CF version)


Same car but with the aluminum version (different fin style)
http://www.e90post.com/forums/attach...1&d=1371000538

Last edited by Andy M; 06-17-2013 at 11:31 AM.
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      06-17-2013, 11:10 AM   #2
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Looking good if you have them by like 2 months I might pick them up from Toronto going there to visit family good job
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      06-17-2013, 11:30 AM   #3
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Quote:
Originally Posted by 330xtrai View Post
Looking good if you have them by like 2 months I might pick them up from Toronto going there to visit family good job
330xtrai We'll see if I have them in 2 months. Hopefully I'll be receiving the next batch of shipments then.
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      06-18-2013, 06:52 AM   #4
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I should mention that I ship these to anywhere in the world. So you don't need to be local to purchase.
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      06-18-2013, 11:20 PM   #5
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SIICK DUDE!
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      06-19-2013, 01:17 AM   #6
Andy M
 
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Btw I should add, they were designed around Cyba's CF diffuser pieces:
http://www.e90post.com/forums/showthread.php?t=318547

(some people have asked me where I got my diffuser from which matches the CF design)

Stand-alone though it doesn't look bad.
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      06-19-2013, 01:18 AM   #7
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Thanks Dylanize, let me know if you're interested in getting one!
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      06-19-2013, 08:54 AM   #8
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Quote:
Originally Posted by Andy M View Post
Thanks Dylanize, let me know if you're interested in getting one!
Once i get my m-tech rear end, then YES FOR SURE!
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      07-04-2013, 07:57 PM   #9
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Wow looks pretty cool. I dig it.
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      07-05-2013, 10:43 PM   #10
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DC_Oldboy Thanks!
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      07-06-2013, 12:04 AM   #11
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Send a message via Skype™ to Taran.J
Interested for my non mtech e90
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      07-06-2013, 02:24 AM   #12
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Taran.J it should work
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      07-06-2013, 03:31 AM   #13
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Quote:
Originally Posted by Andy M
Taran.J it should work
PM me best price shipped to 98338 in carbon fiber. Cheers
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      07-06-2013, 04:18 PM   #14
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Can't get this off my mind lol. Any pics of how this would look like with performance diffuser? I wonder if that's too much though..
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      07-07-2013, 08:22 PM   #15
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DC_Oldboy sorry no pictures with the performance diffuser just yet.
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      07-10-2013, 03:57 PM   #16
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Pm'd
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      07-12-2013, 05:38 PM   #17
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Any in the works for the 1 series? I'd def be interested. Feel free to pm me
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      07-13-2013, 08:15 PM   #18
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Am so gonna buy this when I get some cash. Please don't stop making these any time soon.
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      07-14-2013, 10:10 PM   #19
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Upgrade+, 1 series might be a little difficult. F30 is the next priority in terms of getting something out.
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      07-14-2013, 10:13 PM   #20
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kudos sounds good, let me know.
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      07-16-2013, 11:26 PM   #21
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i wonder how this will look like on a 335is rear
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      07-16-2013, 11:29 PM   #22
Andy M
 
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TurboSid I have yet to try that actually.
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