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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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  #176  
By anthoj on 04-29-2011, 01:38 PM
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Quote:
Originally Posted by Spacelyyy View Post
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?
Unless you can teleport the OEM filter out and the K&N filter in, I think you have to take the whole box out. Like the guy above me said, it's really easy, takes less than 5 mins to do.
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  #177  
By Spacelyyy on 04-30-2011, 01:20 PM
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Quote:
Originally Posted by 4corners View Post
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.
Is their any negatove effects to taking out the carbon filter, cuz i saw some people mentioning some on another thread, but idk if their right.
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  #178  
By 4corners on 04-30-2011, 01:26 PM
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The carbon filter is to prevent gases from coming OUT of the engine after it shuts off. It makes a car a SULEV instead of a ULEV. Take it out. There are NO negative effects.
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  #179  
By hogbmw on 07-31-2011, 10:33 PM
Did this today, drove it a little down the street and felt a difference but it might have been placebo. Does it take a little for your ecu to figure it out?
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  #180  
By 4corners on 07-31-2011, 10:36 PM
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It does take some adjusting. The wider range of driving the better. Full throttle, etc.
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  #181  
By craigmc163 on 08-27-2011, 11:16 AM
So I have also performed this mod, and here is a hint! Soak the filter and box with water prior to doing this! It makes the filter easer to cut out and stops alot of the dust that comes off during cutting! Your going to have to wash the air box anyway so Why not make your life more easy!
Also your not going to win any races by doing this but if you like to hear your car as you drive and don't want to spend $400 on an intake this mod is for you!
As for the issues with dead spots in the rpm band, take your time and don't rush! Putting it back together properly is the key! Also make sure you clean your mass air flow sensor while it's out! Cleaner can be bought at autozone, just be careful it's a very sensitive part! If you damage it BMW likes them alot so you will pay for it.
This mod and my BMS power box made my car come alive! It has also improve the drone from my after market eisenman exhaust! Don't get me wrong your gonna have drone from any free flowing exhaust but this helps drastically!
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  #182  
By beskone on 09-04-2011, 03:46 PM
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Best 45 minute mod ever

I removed airbox, then the MAF, used a box cutter to remove the carbon filter, a dremel and a flat file to sand down the rough spots, then vacuumed out the box, then washed it out with a hose and let it get bone dry in the sun.

Pulled the power from the battery for 1 minute to re-set the computer, re-connected and fired her up.

Not really noticeable sound wise, but man it revs so much freer now! The lag when fist hitting the gas is totally gone, and it seems to pull smoothly through the entire RPM range now, where as before there were little flat spots in the power band.

Blipping the throttle to rev match on downshifts is like butter now, before there'd be this little lag and then you end up over revving or missing the downshift waiting for the engine to rev, not anymore blip the throttle and bam! rev's come right up.

Didn't do the K&N as no one had it in stock today and I've only got 19k on the car so no need to change the filter just yet anyways.
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  #183  
By Pittsburger on 09-09-2011, 09:26 PM
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Pain in my ass pipe

Awesome Dyi. That pipe that feeds the engine is a pain to put back in, I kept rubbing up against other parts of the car and I hope I didn't damage the maf cause I kept jamming it up against the metal ring band (around pipe end). I had a Tiburon before my e90 and boy the Germans could care less how to make systems simple to maintain.

Btw,

Good idea about cutting out carbon filter after wetted.

Cheers
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  #184  
By Njprince0226 on 11-30-2011, 06:44 PM
Thanks a bunch, just after installing the k&n filter I noticed that my car drives more smootly and accelerates easier easily worth the $50 in my opinion.
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  #185  
By Njprince0226 on 01-01-2012, 12:58 PM
What's the purpose of removing the charcoal filter?
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  #186  
By 4corners on 01-01-2012, 01:08 PM
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Quote:
Originally Posted by Njprince0226 View Post
What's the purpose of removing the charcoal filter?
To improve air intake. The filter is redundant. It is to stop gases from coming OUT of the engine when it shuts off. It is part of the SULEV cars. (California)
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  #187  
By DUI Elite on 01-10-2012, 03:59 PM
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my MAF sensor doesnt seem to want to come out. Did those that did this just wiggle it out? I don't want to damage it
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  #188  
By 4corners on 01-10-2012, 07:37 PM
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Quote:
Originally Posted by DUI Elite View Post
my MAF sensor doesnt seem to want to come out. Did those that did this just wiggle it out? I don't want to damage it
Once you unplug the wires and remove or loosen the two torxs screws, it should wiggle out. There is a pretty good rubber o-ring type seal. It's not fragile. Just don't bend the shiny parts.
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  #189  
By DUI Elite on 01-10-2012, 08:18 PM
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Quote:
Originally Posted by 4corners View Post
Once you unplug the wires and remove or loosen the two torxs screws, it should wiggle out. There is a pretty good rubber o-ring type seal. It's not fragile. Just don't bend the shiny parts.
Thanks! Yeah I saw the green rubber o-ring.

Finished this up today since it was so unusually warm for january.

I didn't unplug the battery. Idk if its just a placebo effect, but it seems a bit smoother.

People didn't notice the biggest differences until after a 50 mile drive cycle?

I did the K&N Filter and Charcoal filter delete
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  #190  
By kiwi29 on 01-10-2012, 11:25 PM
I did the charcoal delete, i don't really feel any difference. did the k&n filter and silencer removal all in the same day as well, don't notice performance difference just louder on the climb going past 4k
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  #191  
By DUI Elite on 01-29-2012, 07:19 PM
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Just following up with my charcoal filter delete + K&N Filter...

Definetly get an additional 2 mpg's driving around. I used to get around 27 or 28 driving to and from work, but I'm consistently getting 29.5 mpg. Driving in manual mode, and honestly like I'm in no rush.

Highway only driving gets me 31.7 mpg crusing between 70 and 80.
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  #192  
By letsgopadres on 02-02-2012, 02:40 AM
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Awesome write up. Thank you!
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  #193  
By Lozzatron on 02-02-2012, 11:55 AM
good post will be doing this myself now
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  #194  
By phozenstone on 02-05-2012, 04:28 PM
just did the charcoal delete and K&N filter today....felt no difference whatsoever
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  #195  
By 4corners on 02-05-2012, 05:10 PM
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Give it a few days. It's subtle, and the computer will adjust slightly for the additional air, and provide a little more gas to keep the mixture correct. Theoretically.
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  #196  
By GoRomeo on 03-21-2012, 01:41 PM
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Quote:
Originally Posted by DUI Elite View Post
Just following up with my charcoal filter delete + K&N Filter...

Definetly get an additional 2 mpg's driving around. I used to get around 27 or 28 driving to and from work, but I'm consistently getting 29.5 mpg. Driving in manual mode, and honestly like I'm in no rush.

Highway only driving gets me 31.7 mpg crusing between 70 and 80.
Same here, I did this mod last friday along with MAF clean. And yes I did notice a little better MPG, and smoother idling. I am getting the same readings a you are.

Next= clean Vanos. I do need to clean my engine bay before. I can hardly see the vanos solenoids. Theyre full of oil grime. Never washed my engine bay ever.
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  #197  
By nycbr on 03-26-2012, 09:42 AM
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Quote:
Originally Posted by GoRomeo View Post
Same here, I did this mod last friday along with MAF clean. And yes I did notice a little better MPG, and smoother idling. I am getting the same readings a you are.
I also cleaned the MAF at the same time and also noticed better MPG.
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