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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: Charcoal filter removal



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adr's Avatar DIY: Charcoal filter removal
adr
06-04-2006
I have been reading the discussion in this thread (http://e90post.com/forums/showthread...=carbon+filter) for a while. Since no one post DIY yet, I decided to do it myself.

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  #132  
By mahan518 on 05-17-2010, 01:42 PM
Just got done doing this install. Great DIY.
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  #133  
By mattsten on 06-13-2010, 03:29 PM
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Quote:
Originally Posted by mahan518 View Post
Just got done doing this install. Great DIY.
Ditto. Definitely worth the work. Intake noise seems to be a bit louder now which I like. I bought a K&N but decided to stick with the oem filter as I know it will keep more dirt out of the engine.
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  #134  
By bimmergixxer on 07-03-2010, 04:11 PM
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Easy mod and quick. It is HOT out and all parts slid back in place like melted butter Going to a party and will try it out in a couple hours.
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  #135  
By 777ER on 07-26-2010, 10:37 PM
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Just did this to my car and I have PBX in it which really show the charcoal filter delete mod really works.

Def a improvement in accelertion and fuel burn overall, esp WOT it pulls harder now.
Filled up my car and the 'miles of fuel to go' would start counting down from 345 miles, now it does it from 375.

Can't believe the charcoal filter was restricting the airflow so much it was like choking the engine.

I checked my wife's new 2010 Honda Accord EX-L V6 intake filter and box, there's no charcoal filter in there or anything close to that.
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  #136  
By mr.kobayashi on 09-06-2010, 07:08 PM
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Is there any advantage with the K&N vs OEM filter? I was also considering putting in an Euro Airbox instead of this delete. But it seems like that and the performance intake have almost zero effect/not worth it.

But did anyone notice charcoal remnants on the OEM filter after removal? My machine has 3500 miles on it, so it doesn't really need a new filter. I am thinking this mod would be even cheaper using the same OEM filter from original assembly etc.
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  #137  
By moto_noob on 09-06-2010, 07:31 PM
yes you could just reuse the oem filter. but the k&n is reusable, clean and reuse. And i think the oem filter seems kind of cheaper.
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  #138  
By mr.kobayashi on 09-06-2010, 09:30 PM
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Thanks Moto. Think I'm gonna reuse the filter until I need a new one and save 50$.
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  #139  
By AllStock on 09-28-2010, 04:23 PM
Sorry to ask a noobie question... I have 07 e92. There's a charcoal filter instead of the regular filter??

Also, where can I get the K&N filter for cheap? I'd really like to do this mod if I have the charcoal filter..

Thanks in advance..
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  #140  
By LloydJr on 09-29-2010, 08:56 AM
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Ok, reading all this, I'm a bit confused. Are there two filters? - the ypical filter you find in any car and another charcoal filter for space-age tecnology filtering?. Is there a filter that needs replacing for maintenance beside the charcoal cut out?.
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  #141  
By 777ER on 09-29-2010, 05:36 PM
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Quote:
Originally Posted by AllStock View Post
Sorry to ask a noobie question... I have 07 e92. There's a charcoal filter instead of the regular filter??

Also, where can I get the K&N filter for cheap? I'd really like to do this mod if I have the charcoal filter..

Thanks in advance..
There's a charcoal filter that's permanently attached to the upper airbox, and then there's a replaceable filter after that.

Works like this: Air goes into the airbox, then into the replaceable filter, then passes thru the charcoal filter, then into the engine.

The charcoal filter is there to capture backflow from the engine when it's shut down, ie fuel vapors or mist from the PCV system.

I don't know why it's worth putting it in there, even my wife's 2010 Accord V6 doesn't even have it.
Last edited by 777ER; 09-29-2010 at 09:23 PM.
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  #142  
By 777ER on 09-29-2010, 05:37 PM
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Quote:
Originally Posted by LloydJr View Post
Ok, reading all this, I'm a bit confused. Are there two filters? - the ypical filter you find in any car and another charcoal filter for space-age tecnology filtering?. Is there a filter that needs replacing for maintenance beside the charcoal cut out?.
That is correct, there's basically 2 filters in there, one is replaceable, and one is not.
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  #143  
By ska///235i on 09-29-2010, 07:37 PM
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No, regular air filter....then charcoal filter

Quote:
Originally Posted by 777ER View Post
There's a charcoal filter that's permanently attached to the lower airbox, and then there's a replaceable filter after that.

Works like this: Air goes into the airbox, then passes thru the charcoal filter, then into the replaceable filter, then into the engine.

The charcoal filter is there to capture backflow from the engine when it's shut down, ie fuel vapors or mist from the PCV system.

I don't know why it's worth putting it in there, even my wife's 2010 Accord V6 doesn't even have it.
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  #144  
By 777ER on 09-29-2010, 09:24 PM
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Quote:
Originally Posted by ska325xi View Post
No, regular air filter....then charcoal filter
My bad...corrected.
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  #145  
By AlanAZ on 09-29-2010, 10:42 PM
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Quote:
Just did this to my car and I have PBX in it which really show the charcoal filter delete mod really works.

Def a improvement in accelertion and fuel burn overall, esp WOT it pulls harder now....

Can't believe the charcoal filter was restricting the airflow so much it was like choking the engine.
Agreed. I replaced my filter with an oiled AFE, and it totally rocks. When I blip the throttle for downshifts, the RPMs go up immediately now, like on my previous E46. Before I had to plan ahead and give more gas. I think this is a must-do. Oh, and scoops help also - but there was more dirt in the airbox than without them, you just need to clean it and filter more often.
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  #146  
By LloydJr on 10-05-2010, 11:11 AM
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Thanks Bro. I'm planning to knock it out this weekend.
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  #147  
By dirte90 on 10-14-2010, 11:20 PM
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Thanks for the nice DIY. I just knocked this out along with the intake silencer delete in about 25 minutes. If you take your time and pay attention it is VERY easy!
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  #148  
By dtc100 on 10-17-2010, 09:07 AM
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Quote:
Originally Posted by frdvshcy View Post
Thanks for the nice DIY. I just knocked this out along with the intake silencer delete in about 25 minutes. If you take your time and pay attention it is VERY easy!
The intake silencer delete seems a risk, I would find a good tube to replace the stock tube instead. Besides I don't see the silencer causes any air restriction.

After the charcoal filter removal, last night I took the car out for a test drive, it did sound a bit more aggressive.
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  #149  
By dtc100 on 10-18-2010, 03:14 PM
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BTW, after looking at the BMW Performance Intake pictures, it looked not too different than the stock intake box other than one opens on the top, the other splits open.

Did anyone make an attempt to DIY a high flow cone filter into a stock air box? How do you order a stock air box to try a project like this?
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  #150  
By E90aL on 10-19-2010, 07:39 PM
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for the people who did this mod, did you remove all the ridges from the box? i sanded for a long time and i still cant make the surface flat for the zig zag area.
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  #151  
By qclik on 11-26-2010, 12:12 AM
i just did this mod, and my air box still got the zig zag thing like yours, but i think its fine as long as no more fiber of the charcoal filter left.

i didn't disconnect the sensor, cause i can't get it off the connector, so i just take it off from the airbox while still connected and put it back again when i install my air box back.
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  #152  
By klove83 on 01-03-2011, 12:28 AM
Nice I like
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  #153  
By intensee92 on 01-19-2011, 03:20 AM
Question, so once you take out the charcoal filter right, did you all just replace the charcoal filter with a K&N filter and leave the other air filter in...? (two filters)

Or remove the charcoal filter and replace the air filter with a K&N one. (one filter)
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