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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Cosmetic and Lighting Modifications (exterior/interior) > Complete Aero Build



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      03-09-2012, 06:56 PM   #23
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Car looks sweet man, and numbers are great,

i would love to be able to run a fully functional aero kit
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      03-09-2012, 08:08 PM   #24
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That thing is beast! Keep up the great work.
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      03-11-2012, 04:29 AM   #25
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Quote:
Originally Posted by 335iJWC View Post
Car looks sweet man, and numbers are great,

i would love to be able to run a fully functional aero kit
Quote:
Originally Posted by TeamSoloE93 View Post
That thing is beast! Keep up the great work.
Thanks Guys,

The final testing day will be tomorrow if the wind stays under 5mph. The bulk of the testing is complete...but now we get to find fun ways to improve upon everything. We'll be experimenting with diffuser angle of attack, ride height, rake, drag pocket, side skirts distance off the ground, etc. to see what benefits can be had.

Stay Tuned! If everything goes well, i should have the data presentable mid-week
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      03-12-2012, 11:51 PM   #26
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Awesome stuff!
What material did you use to craft this test model?
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      03-13-2012, 09:35 AM   #27
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Sweet
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      03-13-2012, 01:07 PM   #28
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Hey man nice car i love it! I know this is off topic but what kind of blackline tail lights do you have on it? They are SEXY
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      03-13-2012, 03:55 PM   #29
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FUCKING LEGIT!!! one of the best threads in this forum, imo.

and your aero setup is by far the BEST setups ive seen in this forum. sure, some other pieces on other peoples car might look a bit cooler, but yours is hands down REAL. especially that rear. now that is what you call a rear diffuser. not some pretty carbon fiber piece stuck on to the lower part of the bumper for decoration.
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      03-14-2012, 01:27 AM   #30
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^^^ well said bro!


great update op, look'n 4ward 2 more...
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      03-14-2012, 11:58 AM   #31
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Thanks guys...I have a ton of data to go through from last weekend, and will be sifting through all of it tonight if I get time

In essence, the ~600lb conversion is quite a phenomenol achievement
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      03-14-2012, 05:26 PM   #32
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It's a tragedy that the awesomeness of this project will be lost on the majority of people on this board, I.E. brahs looking for a sweet lip for their cars. Excellent.
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      03-18-2012, 02:49 AM   #33
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Hey All, just wanted to give a quick update on the diffuser project from the past month or so. I've been working with a couple great resources and also got ahold of a stock E90 335i for baseline testing, so I now have some great data to make educated evaluations of the performance of this system 

I have been working with 2 amazingly intelligent resources from the U of M; an Aerodynamicist/Professor and a Physics/Aerodynamics student. They have been very helpful with teaching me more of the intricate testing possibilities and brainstorming solutions to everything. They both have the background knowledge of aerodynamics and also a passion for cars and racing. In addition to the current setup, we're working on more testing of different side skirt placement and even running vortices on the front splitter, which would negate the need for side skirts anyways.

Here is a quick pic of how the car is sitting at the moment (without the side skirts). Since the last thread I’ve made the splitter larger and thicker, which required adding supports rods, lowered the car significantly and used even taller side skirts.

M3 Wheels 1 (1024x683) by MDM Enterprises, on Flickr

So much of this data I'm posting up might not be understandable at first glance, but try to imagine this simply as a comparison between Mark's car (stock) vs. my car (underbody system). The data I have below is showing pressure differentials at different speeds for both cars. The [lower] pressure differential is what either pulls the car to the ground, where the high pressure [underneath] pushes it up from the ground. This is a very simple, to-the-point method of testing differences in pressure. Similarly, turbulence (quick fluctuations in pressure) is very good to measure as that can both create. Sure, there are much more sophisticated, accurate and complete ways to test the system (especially the flow separation and air speeds of the rear diffuser). This testing can get extremely involved and can be more unreliable due to variances in external conditions. Regardless, the goal for my testing is to get objective data related to the overall pressure differentials of the underneath side of my ricecar, and simply testing pressures of ~40 data points with multiple magnahelics and a manometer is much more than adequate for my goals

Without further ado, here is the data from the past couple weeks:

Stock- 85mph

Stock E90- T1 85mph by MDM Enterprises, on Flickr


Underbody T1- 85mph

Underbody-T1 85mph by MDM Enterprises, on Flickr


Underbody T2- 70mph

Underbody- T2 70mph by MDM Enterprises, on Flickr


Underbody T2- 100mph

Underbody T2- 100mph by MDM Enterprises, on Flickr


Underbody T2- 140mph- Anticipated

Underbody- T2 140mph by MDM Enterprises, on Flickr


In summary, the downforce of this underbody system compared to stock are:
70mph- Delta of apx. 302lbs
85mph- Delta of apx. 473lbs
100mph- Delta of apx. 543lbs
140mph- Delta of apx. 746lbs

These numbers are calculated based on the average pressure in front of the front axle multiplied by the square inches of the ‘meat’ area in that same area, and similarly based on the center and rear section.

Any questions, comments, insults or jokes are welcomed. I am aware of how silly this is, and I am reminded of it multiple times a week when random teenagers ask me “Dude, that’s a sweet body kit, where’d you get it?!”
Cheers,
Brian


Random pics:

Diffuser CAD 1 by MDM Enterprises, on Flickr

Diffuser CAD 2 by MDM Enterprises, on Flickr

M3 Wheels4 (1024x683) by MDM Enterprises, on Flickr
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      03-18-2012, 03:17 AM   #34
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very sick, how do you get over speed bumps?
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      03-18-2012, 03:38 AM   #35
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Quote:
Originally Posted by longtran@ltbmw View Post
very sick, how do you get over speed bumps?
Coming from you that's quite the compliment, thanks!

So the diffuser scrapes A LOT, haha. Going in/out of my driveway, speed bumps, parking garages, any inclines whatsoever scrapes the diffuser. Luckily, the side skirts and strakes on the diffuser are 1/8" ABS and can flex very easily and will return to the original shape. Esentially, yes it scrapes like crazy but it the only issue it causes is embarrasement/shame from nearby people seeing/hearing it.

The sideskirts are/will only be on for the track, otherwise those would also scrape on just about anything. The splitter has yet to scrape on anything, surprisingly.
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      03-18-2012, 04:27 AM   #36
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im seriously in love with that rear diffuser... cant. stop. staring at it.
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      03-20-2012, 04:21 PM   #37
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Quote:
Originally Posted by edirtaynine View Post
im seriously in love with that rear diffuser... cant. stop. staring at it.
Haha thanks, just wait til it gets built out of carbon the proper way
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      12-02-2013, 11:13 AM   #38
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Quote:
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Haha thanks, just wait til it gets built out of carbon the proper way
HAHA i like how you say it scrapes like sh** and then your gonna make it out of carbon I hope it survives
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      08-14-2017, 06:19 PM   #39
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Bump - anyone still around?
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      08-15-2017, 06:37 PM   #40
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Nice thread from the past on aero. Helpful data points! BrianMN you still around?
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      08-23-2017, 05:22 AM   #41
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Amazing thread, cant believe it didnt get more love.
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      12-10-2018, 01:39 AM   #42
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I guess one needs such diffuser that comes on/off in a minute, held in place by 4 studs/nuts... and that is quite hard to do, taking in account that it must be very rigid, light and installable in one person...
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