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Old 11-27-2013, 01:18 AM   #1
Slowered318
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E30 cabin air filter

I thought I would share my latest project... A cabin air filter for US spec HVAC. woohoo!

After removing the A/C and evaporator from my air box I noticed a lot of debris coming through the vents, the fan was also noticeably louder. Well this was almost 10 years ago, I finally got around to working out a solution after countless searching.

I took some measurements and found that the FRAM CA8205 air filter from 01-06 Jeep Wrangler fit almost perfectly in the void where the evaporator came out, it's nestled in between the fan and the heater core. I had to build a frame out of hardboard to position the filter panel tightly in place. I generously coated it with fibreglass resin to protect it from moisture and used some low quality foam tape just like BMW. Simplest solution would be some open cell foam air filter medium but I couldn't find anything thick enough to fill the void and not get pushed through by air pressure. This FRAM filter should flow enough for the HVAC capacity and is redly available.

What do you guys think, any improvement ideas? I still have the exact measurements if anyone else wants to tackle this one, maybe we can have an E30 cabin filter build off!
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File Type: jpg airfilter1.jpg (99.5 KB, 106 views)
File Type: jpg airfilter2.jpg (124.3 KB, 107 views)
File Type: jpg airfilter3.jpg (148.4 KB, 107 views)
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The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers
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Old 11-27-2013, 01:28 AM   #2
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yeah you would ****ing retrofit a cabin filter wouldn't you.
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Old 11-27-2013, 07:11 AM   #3
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Great idea!! very nicely done..if you want to have no a/c that is. :-)
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Old 11-27-2013, 09:16 AM   #4
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Quote:
Originally Posted by propr'one View Post
yeah you would ****ing retrofit a cabin filter wouldn't you.
No flies on me! It's also a good excuse to vacuum out my air box and acid wash the heater core.

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Originally Posted by Ceeker View Post
Great idea!! very nicely done..if you want to have no a/c that is. :-)
Comfy seats and power windows/locks is about the only creature comforts I have or need. Oh and I have one of these http://www.amazon.ca/RoadPro-RPSC-85.../dp/B000765MHI LOL girlfriend hates my car.
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The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers

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Old 11-27-2013, 11:03 AM   #5
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Nice work Ryan. You are probably the only one to do this
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Old 11-27-2013, 12:02 PM   #6
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awesome. only suggestion i'd have, those fram filters aren't carbon activated because they're engine air filters not cabin filters. I'd try find a cabin filter in the same dimensions, it helps a lot with keeping odors from entering the car. If you're already going so far to make it perfect, might as well.


gimme the dimensions i'll see if i can come up with anything for you.
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hid headlights hid kit

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Old 11-27-2013, 12:52 PM   #7
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Nice work Ryan. You are probably the only one to do this
Thanks and that's because I'm "special"

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Originally Posted by propr'one View Post
awesome. only suggestion i'd have, those fram filters aren't carbon activated because they're engine air filters not cabin filters. I'd try find a cabin filter in the same dimensions, it helps a lot with keeping odors from entering the car. If you're already going so far to make it perfect, might as well.

gimme the dimensions i'll see if i can come up with anything for you.
Wasn't a large selection of cabin specific filters at CT, maybe Parts Source has more to pick from if they will let me spend an hour and open up all the boxes. Not sure I need carbon, I'm afraid the biggest odour is me Mainly trying to filter out road dust, pollen, and tree crap from flying out my vents all over the interior.

dimensions are maximum 6 W x 13 L x 3⅞ D or 160x350x100mm in the rest of the world.
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Old 11-27-2013, 01:10 PM   #8
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maybe cut this and add it to your current set up (after the air filter not before)
http://www.staples.ca/en/Fellowes-CF...FZFDMgodkTAAdQ

stop farting in the e30.
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Old 11-27-2013, 02:29 PM   #9
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Thanks and that's because I'm "special"
Magic Shortbus?

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Old 11-27-2013, 03:36 PM   #10
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Originally Posted by propr'one View Post
maybe cut this and add it to your current set up (after the air filter not before)
http://www.staples.ca/en/Fellowes-CF...FZFDMgodkTAAdQ

stop farting in the e30.
OMG sick idea, guess where I'm going after work today…

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Magic Shortbus?
I don't get it, big yellow 318ti?
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Old 12-04-2013, 09:38 AM   #11
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Had to redesign my filter, v2 is installed and works great. Foul road odours are lessened thanks to propr'one's suggestion and airflow is not restricted.

The original concept wouldn't fit due to the ECU wire and battery tray thats located in front of the glove box.
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Old 12-04-2013, 09:51 AM   #12
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You can buy an OEM cover plate and Microfilter for about $125 - couldn't find the plate but here's the microfilter:

http://www.realoem.com/bmw/showparts...=64&fg=10&hl=3

They were available on non A/C equipped late model e30's.
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Old 12-04-2013, 10:12 AM   #13
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sweet!


remember that the charcoal activated filter actually absorbs odors, so it will "fill up" and stop working eventually. I'd follow the replacement periods for similar vehicles with OEM CA filters (like e46 m3), so 2 years.
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hid headlights hid kit

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Old 12-04-2013, 02:11 PM   #14
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Geez louise to look at that dirty filter it makes you really wonder what kind of junk are we breathing everyday? I hav'nt taken a look at one yet but do you think there might be room to add a filter "box" similar to your set up and still keep the a/c evaporator?
It would require about an 1 1/4" of room to relocate either the airbox or airbox and evap lower than it is now based on the thickness of the cabin air filters I've seen.

Do you have any pics of v2 prior to install Mr. Slow?
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Old 12-04-2013, 04:15 PM   #15
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You can buy an OEM cover plate and Microfilter for about $125 - couldn't find the plate but here's the microfilter:

http://www.realoem.com/bmw/showparts...=64&fg=10&hl=3

They were available on non A/C equipped late model e30's.
NickP, It was pretty easy to "cap off" the existing cover plate with fibreglass. As for the OEM microfilter, I didn't want to special order it, it's designed for the European air box and most likely doesn't fit. I might just ship a complete air box from somewhere in Europe, some issues I noticed with my existing one so I wouldn't mind replacing it.

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Geez louise to look at that dirty filter it makes you really wonder what kind of junk are we breathing everyday? I hav'nt taken a look at one yet but do you think there might be room to add a filter "box" similar to your set up and still keep the a/c evaporator?
It would require about an 1 1/4" of room to relocate either the airbox or airbox and evap lower than it is now based on the thickness of the cabin air filters I've seen.

Do you have any pics of v2 prior to install Mr. Slow?
The V2 filter is actually brand new, picture was taken just prior to instal, It's dark because of the charcoal crystals. I also had to hot glue some material to the sides of the filter to make it fit snug. Thinnest filter panel I could find was inch, I doubt you could install that before or after the A/C evaporator.

The evaporator core actually filters the larger debris, along with the heater core it gets very dirty over time. To freshen things up I would remove both and soak them in Zep cleaner, blast your vents and box with compressed air, then wipe everywhere you can reach. You might be able to wrap the evaporator with 3M hammock style furnace filter material, It's about 3/16 inch in thickness and shouldn't restrict air flow.
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The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers

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