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Old 03-26-2010, 06:57 PM   #1
matty.dc
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E30 DIY: M30 AFM in stock airbox and intake boot

Not too sure how many people have done this since I mostly see custom intake tubes and cone filters on the end of the AFM.

Step 1: Stretch intake boot over larger AFM: I just used a shaker cup I had in my cupboard and then put it in boiling water for about half an hour. After that time I took the shaker cup out and wiggled it onto the AFM which was still a pain in the ass.

Step 2: Enlarge the hole and drill holes for the AFM: I took the front part of the AFM off, which is 4 screws and used that as a template for the holes to drill and the opening for the airway. There is a metal plate inside the airbox and its needs to be removed. I used a flat head and punched it through the four holes to get the plate off. To bore the hole I used a drill bit like an anmil (if you know anything about machining) to cut the hole.

Step 3: Mount the AFM in the airbox: I went to Part Source and bought 4 M6 studs and mounted them in the M30 AFM. Before you screw it in you're going to have to fill the gap between the top of the air box and the AFM. I used a gasket maker and then fastened the AFM down.

Connect to intake tube to the throttle body, etc. and you're done!
Attached Images
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File Type: jpg SANY0434.JPG (142.9 KB, 870 views)
File Type: jpg SANY0435.JPG (191.5 KB, 882 views)
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Old 03-26-2010, 10:09 PM   #2
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Similar to how I did mine, except I filed the hole perfectly square, and filled the edges so it was smooth on the inside. I always wanted to recreate that intake funnel inside but never got around to it, I will probably toss it all anyways for my MAF project this spring

On that note, do you have any driveability problems with your M30 AFM?
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Old 03-26-2010, 10:41 PM   #3
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Stock air box come-on man

I need to make a heat shield for mine still....





good work though
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Old 03-26-2010, 11:04 PM   #4
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Honestly, the m30 afm sounds better then any cold air I have ever heard, not to mention it looks stock.
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Old 03-26-2010, 11:13 PM   #5
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Doesn't the smaller intake boot kinda bottleneck the idea?
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Old 03-26-2010, 11:51 PM   #6
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Quote:
Originally Posted by SamE30e View Post
Doesn't the smaller intake boot kinda bottleneck the idea?
Not really since the next bottle neck will probably be the throttle body. On that note does anyone have a scrap M30 or M50 throttle body lying around? I want the throttle plate so I can do a BBTB
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Old 03-27-2010, 10:51 AM   #7
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Quote:
Originally Posted by Bullet Ride View Post
Stock air box come-on man

I need to make a heat shield for mine still....





good work though

you should do a DIY for your heatshield. I need to make one as well
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Old 03-27-2010, 12:48 PM   #8
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you should do a DIY for your heatshield. I need to make one as well
I might, but if I do it will pretty much be the same as this

http://www.davelength.net/car/cai.html
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Old 03-27-2010, 12:57 PM   #9
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those 2 engines look very clean
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Old 03-27-2010, 01:34 PM   #10
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those 2 engines look very clean
I hope you're not talking about mine, because mine is dirty lol...
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Old 03-27-2010, 04:21 PM   #11
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if urs is dirty i dont what to call mine lol...still like ur bimmer tho way back to the october meeting and with the pic you go on right now...is dat an is lip?
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Old 03-27-2010, 05:21 PM   #12
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Afm

Quote:
Originally Posted by craz azn View Post

On that note, do you have any driveability problems with your M30 AFM?
I dont have any driveability issues although I still have to put in my 19lb injectors.
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Old 03-27-2010, 07:34 PM   #13
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if urs is dirty i dont what to call mine lol...still like ur bimmer tho way back to the october meeting and with the pic you go on right now...is dat an is lip?
Thanks man. Although my car won't look like it did in october, the winter has been rough on it, lots of new rust showing up

Yeah that's an iS lip.... which I unfortunately no longer have on because it got ripped off when I put my car in a ditch. I still have it, I just need to come up with a way to mount it.
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Old 03-27-2010, 11:21 PM   #14
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sorry to hear dat bro we all i got our lil memories about winter good or bad....looking forward seein the good work on that pic whenever i see ya next meetin
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Old 03-29-2010, 04:31 PM   #15
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Ha ha I am making the shield heat too (right now) Problem is my air filter cone is a lot wider so it goes a bit out to the radiator hose (http://www.davelength.net/car/cai.html) design will not work.

BTW I am making mine from a steel sheet I found in trash from some old computer case man we are cheap. creativity has no limits.

Pics to come...
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