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Quick & Dirty Engine Air Filter "Mod"
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01-29-2013, 07:01 PM | #1 |
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Quick & Dirty Engine Air Filter "Mod"
Evening, Ladies & Gents,
I've been considering removing the foam "pre-filter" piece from my engine air filter for some time. It has always been my opinion that it is there more for acoustic dampening than for actual filtration. My only concern has been that fully removing the foam piece could somehow affect the seal of the filter against the box and therefore increase the pressure at which the spring loaded secondary intake in the box would be activated. I'll start by saying that I am over-complicating this and you could probably just rip off the foam piece without any adverse effects, however, this is how I decided to proceed...
Ze box... Ze filter... Ze modification... Results? Believe it or not, there is a very mildly increased intake noise with a small bit of added grumble. It is (to me) only noticeable when outside the car or with the windows down, but I asked my wife to tell me if she noticed anything different and she stated that the car sounded "angrier". Were you to emulate the above...if you rev your car while parked before and after, I think you'll notice a slight difference as well. I would imagine that the difference is similar to that of adding a K&N filter, but without the filtration concerns that come with the K&N (for some). For a free 90-second modification, I'll take it.
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Last edited by FormerRotor; 01-30-2013 at 12:49 PM.. |
01-29-2013, 07:39 PM | #2 |
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I really enjoy reading all these posts demonstrating our passionate love affairs with our cars. Only we would get it I guess.
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01-29-2013, 07:58 PM | #3 |
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FormerRotor, can you post a pick for clarification? I have a picture in my head of what you describe, but I just want to make sure. Thanks in advance.
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01-29-2013, 08:02 PM | #4 |
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^Yeah, I tight about it the second that I dropped the hood. I'll take a pic in the morning and add it to the original post.
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01-29-2013, 08:03 PM | #5 |
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Cool. Thank you sir.
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01-29-2013, 08:09 PM | #6 | |
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My pleasure, but you might not want to thank me until I don't forget to do it.
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Last edited by FormerRotor; 01-29-2013 at 08:14 PM.. |
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01-29-2013, 08:51 PM | #7 |
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FormerRotor, can you elaborate on how the secondary spring loaded section of the air filter box works? I see it, but don't understand how it works. Does it help blow off water/fluids that get in there?
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01-30-2013, 12:54 PM | #9 | |
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I'm obviously not a BMW design engineer, but it seems to me that the spring was likely selected to be compressed at a certain negative pressure to allow air into the box from the engine compartment. This would likely be useful if the intake were clogged so that the engine is not choked out.
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Last edited by FormerRotor; 01-30-2013 at 01:13 PM.. |
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01-30-2013, 02:36 PM | #10 | |
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01-30-2013, 03:59 PM | #11 |
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I wonder how the dealership will take this when they change out your filter to find it's been "modified". Wouldn't they note it down and if something were to happen to the engine in the future deny warranty?
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01-30-2013, 05:20 PM | #12 | ||
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You are not removing any filtration capability by removing the foam and the actual filtration media is the pleated paper filter behind the foam. Te only thing you may be doing is causing the filter to load more quickly as you are reducing the surface area (but the foam is porous enough that it is really only catching the big bits). If they were smart enough, they would likely feed you some bologna about how the foam disrupts the cavitation of airflow in order to more evenly disperse the air over the filter media and allow more regular flow over the MAF (but this would be bologna), especially considering that they have many other vehicles with newly identical box design and only a paper filter (no foam). |
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01-31-2013, 09:11 AM | #13 |
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Rotor I hv not forgotten you I will try to send pics today ok Im under construction at my home
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01-31-2013, 10:15 AM | #14 |
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Haha. No worries, PR. This is all of our "second lives", the primary has to take priority. Talk soon! What kind of work are you doing?
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01-31-2013, 11:04 AM | #15 |
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Expanding closet to garage to add either a Diesel or Gas(Natural) Generator and hang my bikes there!!
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01-31-2013, 01:24 PM | #16 |
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Nice! I love me some garage work
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02-01-2013, 04:59 AM | #17 |
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rry amigo having issues with neighbors about the garage issues i am within the required parameters of construction and they're stating i have it wont , would you believe that they came at 7:30 pm to complain needless to say I tod them I was NOT coming down from my 2nd floor house to see at that LATE any inuendos i am within the property guidelines, Ive contacted the Complex Administrator and an Filed ngineer friend of mines and both state I doing everything correctly, People can be such wads, what eats me is that I know I am doing things correctly and people are trying to falk w me. I'll keep u posted Im sorry I hvnt sent you the pics but will try today ok
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02-01-2013, 09:25 AM | #18 |
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Just out of curiosity, does anyone have the k&n drop in filter? I'm a new member lurking (hopeful future owner) and am surprised at the aftermarket availability (US) of this engine, I'm used to the cold air intakes and the only drop in k&n filters Ive used where on my bike but I have never owned a forced induction vehicle so does anyone know if it would be similar results to remove this foam piece as opposed to getting the k&n drop in? Either way, it is a pretty good free mod
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02-01-2013, 06:24 PM | #19 | |
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02-01-2013, 06:59 PM | #20 | |
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02-01-2013, 09:06 PM | #21 | ||
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02-01-2013, 09:12 PM | #22 | |
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Out of curiousity, why go from a gixer to a diesel bimmer? I would've suspected a pure sports car if its a bike replacement. |
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