Functional Underbody Diffuser Add-On

Andy M · 06-17-2013, 11:22 AM

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

330xtrai · 06-17-2013, 12:10 PM

Looking good if you have them by like 2 months I might pick them up from Toronto going there to visit family good job

Andy M · 06-17-2013, 12:30 PM

Quote:

Originally Posted by 330xtrai

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.

Andy M · 06-18-2013, 07:52 AM

I should mention that I ship these to anywhere in the world. So you don't need to be local to purchase.

Dylanize · 06-19-2013, 12:20 AM

SIICK DUDE!

Andy M · 06-19-2013, 02:17 AM

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.

Andy M · 06-19-2013, 02:18 AM

Thanks @Dylanize, let me know if you're interested in getting one!

Dylanize · 06-19-2013, 09:54 AM

Quote:

Originally Posted by Andy M

Thanks @Dylanize, let me know if you're interested in getting one!

Once i get my m-tech rear end, then YES FOR SURE!

DC_Oldboy · 07-04-2013, 08:57 PM

Wow looks pretty cool. I dig it.

Andy M · 07-05-2013, 11:43 PM

@DC_Oldboy Thanks!

Taran.J · 07-06-2013, 01:04 AM

Interested for my non mtech e90

Andy M · 07-06-2013, 03:24 AM

@Taran.J it should work

Taran.J · 07-06-2013, 04:31 AM

Quote:

Originally Posted by Andy M

@Taran.J it should work

PM me best price shipped to 98338 in carbon fiber. Cheers

DC_Oldboy · 07-06-2013, 05:18 PM

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..

Andy M · 07-07-2013, 09:22 PM

@DC_Oldboy sorry no pictures with the performance diffuser just yet.

Anderw · 07-10-2013, 04:57 PM

Pm'd

Upgrade+ · 07-12-2013, 06:38 PM

Any in the works for the 1 series? I'd def be interested. Feel free to pm me

kudos · 07-13-2013, 09:15 PM

Am so gonna buy this when I get some cash. Please don't stop making these any time soon.

Andy M · 07-14-2013, 11:10 PM

@Upgrade+, 1 series might be a little difficult. F30 is the next priority in terms of getting something out.

Andy M · 07-14-2013, 11:13 PM

@kudos sounds good, let me know.

TurboSid · 07-17-2013, 12:26 AM

i wonder how this will look like on a 335is rear

Andy M · 07-17-2013, 12:29 AM

@TurboSid I have yet to try that actually.

06-17-2013, 11:22 AM	#1
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	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 12:31 PM..
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06-17-2013, 12:10 PM	#2
330xtrai Do you even post BRO? 223 Rep 2,936 Posts Drives: 330xi Join Date: Jun 2012 Location: New Jersey iTrader: (1) Garage List 2006 BMW 330xi [0.00]	Looking good if you have them by like 2 months I might pick them up from Toronto going there to visit family good job __________________ E90\|330xi\|SGM\|Terra Cotta interior\|Forged1 Wheels(one side red the other city lights)\|M3 Rep Front Bumper\|Msport Rear Bumper\|KW V1 Coilovers\|K&N Air Filter\|OEM Black Grille\|Red Cyba Air scoops\|DIY Gloss Black Side Splitters\|Tee rear splitters\|Monkey Air Freshener\| DSC_0395-2
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06-18-2013, 07:52 AM	#4
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	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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06-19-2013, 12:20 AM	#5
Dylanize Captain Dutch Rudder 211 Rep 2,258 Posts Drives: AMG Join Date: Jan 2013 Location: Charlotte, NC iTrader: (8)	SIICK DUDE! __________________ No more E92 or E82
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06-19-2013, 02:17 AM	#6
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	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.
	Appreciate 0

06-19-2013, 02:18 AM	#7
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	Thanks @Dylanize, let me know if you're interested in getting one!
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07-04-2013, 08:57 PM	#9
DC_Oldboy Q(.)-D Q-(^.~Q) 226 Rep 5,378 Posts Drives: like an old person. Join Date: Aug 2009 Location: Bothell, WA iTrader: (39) Garage List 2006 BMW 330i [8.48]	Wow looks pretty cool. I dig it. __________________
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07-05-2013, 11:43 PM	#10
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@DC_Oldboy Thanks!
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07-06-2013, 01:04 AM	#11
Taran.J Major General 1121 Rep 7,062 Posts Drives: BMW, LEX, MBZ, RAM, TESLA Join Date: Jul 2012 Location: Graham, WA iTrader: (7)	Interested for my non mtech e90 __________________ E90 Build Thread (SOLD) http://www.e90post.com/forums/showthread.php?t=809436 F15 Build Thread (SOLD) http://f15.bimmerpost.com/forums/sho....php?t=1064084
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07-06-2013, 03:24 AM	#12
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@Taran.J it should work
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07-06-2013, 05:18 PM	#14
DC_Oldboy Q(.)-D Q-(^.~Q) 226 Rep 5,378 Posts Drives: like an old person. Join Date: Aug 2009 Location: Bothell, WA iTrader: (39) Garage List 2006 BMW 330i [8.48]	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, 09:22 PM	#15
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@DC_Oldboy sorry no pictures with the performance diffuser just yet.
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07-10-2013, 04:57 PM	#16
Anderw Brigadier General 714 Rep 3,390 Posts Drives: F80 m3 Join Date: Feb 2012 Location: FL iTrader: (13)	Pm'd
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07-12-2013, 06:38 PM	#17
Upgrade+ Good life 154 Rep 1,965 Posts Drives: 2008 E90 M3 AW Join Date: Oct 2007 Location: NY iTrader: (8)	Any in the works for the 1 series? I'd def be interested. Feel free to pm me __________________ Current: 08 E90 M3 Alpine White Former: 11 135i Msport Space Gray -Former: 07 335i Titanium Silver E92- Former: 08 135i Alpine White E82- Past: 06 Subaru STI WRB- Past: 04 Audi S4 Imola yellow- Past:97 Honda prelude Ice blue
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07-13-2013, 09:15 PM	#18
kudos Captain 293 Rep 800 Posts Drives: BMW M240i Join Date: Jun 2011 Location: NoVa iTrader: (2)	Am so gonna buy this when I get some cash. Please don't stop making these any time soon. __________________ E90
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07-14-2013, 11:10 PM	#19
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@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, 11:13 PM	#20
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@kudos sounds good, let me know.
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07-17-2013, 12:26 AM	#21
TurboSid Brigadier General 1164 Rep 3,273 Posts Drives: 2022 M4Cx BSM/FR Join Date: Apr 2008 Location: Florida iTrader: (4) Garage List 2008 335i [0.00]	i wonder how this will look like on a 335is rear __________________ 2022 BSM/FR M4 Competition X-Drive 2017 MW/SO M4 ZCP [SOLD] • 2015 MW/SO M4 M-DCT FBO [SOLD] • 2011 AW/CR 335is DCT FBO [SOLD] • 2008 AW/CR 335i 6MT FBO [SOLD]
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07-17-2013, 12:29 AM	#22
Andy M 81 Rep 1,208 Posts Drives: 09 BMW 335i xdrive Join Date: Mar 2008 Location: Toronto iTrader: (5)	@TurboSid I have yet to try that actually.
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