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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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  #154  
By anthoj on 01-21-2011, 12:56 AM
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Quote:
Originally Posted by intensee92 View Post
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)
I too am wondering about this. My K&N arrives tomorrow. I am impatiently waiting to install it. What is the advantage/disadvantage of the charcoal filter?

Thanks
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  #155  
By intensee92 on 01-25-2011, 01:49 PM
back up for an answer up there! ^^^^
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  #156  
By E90aL on 01-25-2011, 02:07 PM
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Quote:
Originally Posted by intensee92 View Post
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)
Quote:
Originally Posted by anthoj View Post
I too am wondering about this. My K&N arrives tomorrow. I am impatiently waiting to install it. What is the advantage/disadvantage of the charcoal filter?

Thanks
you remove the charcoal and replace the air filter with the k&n. The advantage, better airflow(not as much restriction, 1 filter vs. 2). The disadvantage, something about the gasses escaping from the intake when you turn the car off(unsure about this)
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  #157  
By intensee92 on 01-25-2011, 08:38 PM
Ok, thats what I was thinking. I was unsure since I guess I read so much into it that I didn't know what to do. lol

Thanks for clearing it up.
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  #158  
By Fresh330 on 01-26-2011, 11:08 AM
It's kinda strange that the charcoal filter is not replacable. 10 years from now, people will be riding around with the same charcoal filter from the factory! That's definitely going to lower the performance/efficiency of the car down the road.
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  #159  
By johnsonz1122 on 02-06-2011, 04:11 AM
nice guide!
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  #160  
By roundle on 02-06-2011, 04:15 AM
If I upgraded to the Euro Airbox, would I need to still do this?
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  #161  
By jerflash on 02-06-2011, 08:24 PM
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im just going to get the euro box...not that expensive and the dealer cant say anything since it is a bmw part. plus looks a hell of alot better.

euro box does not have the charcoal filter
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  #162  
By Blindrage606 on 02-06-2011, 10:37 PM
Just did this, and it's a great mod for a 328i. There was some white smoke from the tailpipe on initial start, but never repeated again.

Noticeable increase during lower RPM. Which is great for city DDs.
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  #163  
By SmoothStyle1 on 02-07-2011, 04:54 PM
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Is the charcoal filter the same thing as the "microfilter?"
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  #164  
By Chriztofor on 02-07-2011, 06:23 PM
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^ Nope 2 different things. Charcoal filter is located by the air filter. Microfilter is located by your windshield wipers.
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  #165  
By SmoothStyle1 on 02-08-2011, 02:07 PM
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Quote:
Originally Posted by Chriztofor View Post
^ Nope 2 different things. Charcoal filter is located by the air filter. Microfilter is located by your windshield wipers.
Ever seen a DIY for the Microfilter posted anywhere? I searched and couldn't find anything.
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  #166  
By applebimmer on 02-13-2011, 11:40 PM
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Awesome! thanks dude!
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  #167  
By 73tnh on 03-06-2011, 09:46 PM
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I had removed my charcoal filter a while back also. I would recommend you remove the entire air box to do this so the charcoal particles dont fall down into the intake hose. Easy to do and does give a noticable gain in response to the throttle.
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  #168  
By applebimmer on 03-07-2011, 02:06 PM
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This is an excellent must do! My girl is quicker on her feet and smoother on the Accel... The sluggishness at that 3 and 4 gear is gone! Nice write up!
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  #169  
By prican_2000 on 03-07-2011, 10:04 PM
Planning on doing this - this upcoming wknd.

Thanks for taking the time to do the DIY - pics definetely make it easier.

THANKS AGAIN.
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  #170  
By Lebo932 on 03-07-2011, 11:11 PM
hey guys,
I's going to do this on my E92 328 when it gets a little warmer! I'm at work right now and dont have time to read the 8 pages in this thread so apologys in advance if this has already been asked/answered, but i see that you did this on an E90, my airbox is very similar but do you think there may be any differences for my E92? Its simple enough that i'll find out anyway when i do it, just wondering. Thanks!
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  #171  
By DUI Elite on 04-24-2011, 04:41 PM
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anyone notice a difference on MPGs?
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  #172  
By 4corners on 04-24-2011, 10:38 PM
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Quote:
Originally Posted by DUI Elite View Post
anyone notice a difference on MPGs?
My average MPG was 24.9. No complaints. Right after the carbon filter removal, it went to 25.1. Runs better too.
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  #173  
By 4corners on 04-24-2011, 10:41 PM
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Quote:
Originally Posted by Fresh330 View Post
It's kinda strange that the charcoal filter is not replacable. 10 years from now, people will be riding around with the same charcoal filter from the factory! That's definitely going to lower the performance/efficiency of the car down the road.
So true. There's no reason in the would not to get rid of the thing. If I can do it, anyone can.
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  #174  
By Spacelyyy on 04-29-2011, 07:03 AM
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If i wanted to just replace the filter with a K&N would i have to take the whole airbox out, would it make it easier to install?
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  #175  
By 4corners on 04-29-2011, 09:43 AM
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Take the box all the way out. It's not hard. Undue the wire in the back, loosen the hose clamp, undue the two 10mm bolts, take the front plenum off, and tilt the thing out. Clean it inside and out before re-installing it with a new or cleaned filter. Get rid of the carbon filter too. If you have one.
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