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BMW 3-Series (E90 E92) Forum
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Should I use a K&N air filter?
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02-21-2012, 01:34 PM | #45 | |
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No need to "google" it's all right under your nose. http://www.e90post.com/forums/showthread.php?t=137667 http://www.bobistheoilguy.com/airfilter/airtest2.htm "As long as an air filter is properly sized for an application, the lost airflow will be very minimal. This means that there is very little if any power to be found from removing the air filter, much less changing the filter type." You just keep running those aftermarket air filters for all of those gains you are getting and improved filtration. Oh and make sure you post up your dyno results after you dyno your car with a clean OEM filter comparing the results against a dyno pull with no filter. Then tell me how your aftermarket filter is going to make more power beyond the differential. Last edited by cssnms; 02-21-2012 at 01:43 PM.. |
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02-24-2012, 06:54 PM | #46 | |
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Did the same shortly after install. Same conditions. Ambient air temp was very close before and after as was wind speed and direction. I did the same for my AA tune, measuring before and after. I don't know if your assertion about the manufacturer is necessarily true. Perhaps it's true in this case (I really don't know, I'm simply passing on my personal experience about a product), but manufacturers do not always optimize performance; sometimes they compromise to meet the preferences of many people in different markets. |
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02-24-2012, 07:28 PM | #47 |
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I belive my question now would be after i read it all, why do BMW install K&N air filters in their perfomance air intakes and claim an increase in HP as well as torque?
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02-24-2012, 10:57 PM | #48 | |
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what you'll get from a k&n is a little more responsive throttle and a more pleasing (but only slight change) in sound.
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02-25-2012, 08:00 AM | #49 | |
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It's been my experience after keeping strict MPG records for all my cars for the past 20 years or so, that the average MPG per tank varies by more than 1.5 MPG. When I fill my E90 up at the same gas station and same fuel pump (every two days) and then drive unobstructed on a rural 55 MPH highway (not an interstate), my MPG reading from the BC (after resetting it to zero upon fill up before I restart the engine) starts out low, then slowly climbs to over 34 MPG then backs down to around 28 (using numbers just for example). So resetting the BC to get a MPG reading is not an accurate measurement to ascertain the precision of 1.5 MPG. Using my data of average MPG per tank over hundreds of fill ups before and after installation of a K&N filter on three of the five vehicles I installed a K&N filter (for my wife’s cars I don’t keep gas fill up data), I never saw a discernable upward trend in average per-tank MPG. The vehicles were a 1989 E30, 1999 F-150, and a 1999 Honda Valkyrie Interstate. |
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02-25-2012, 08:20 AM | #50 | |
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I'm responding to an OP who asked for input by sharing my personal experience. |
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02-25-2012, 10:50 AM | #51 | |
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02-25-2012, 01:14 PM | #52 | |
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It's good that you have been taking a somewhat scientific method to determining if the K&N adds benefit to the performance of the car (acceleration and/or MPG). Other than straight dyno runs on both filters on the same day can any appreciable determination be made. |
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02-26-2012, 06:57 AM | #53 |
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Holy shit you guys are beating a dead horse with this one. Who really cares about a 1.5 mpg increase. Just stick with oem filters and lets end this damn thread. It will only be about another week before someone else brings this up anyways lol
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02-23-2017, 05:35 PM | #55 | |
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You're not talking about the cabbin filter? |
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02-23-2017, 05:49 PM | #56 |
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The charcoal delete is where you open your stock airbox and take a box cutter and cut the charcoal filter inside the airbox out and put a k&n inside of it. This thread is 5-6 years old so u might get flamed for bumping up
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02-24-2017, 02:25 PM | #59 |
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I have charcoal delete and k and n filter on my car. I m not sure if there was a real power increase but the car sure feels more responsive and peppy and it sounds nice . Even my brother asked me if I had done something to the car after I did the mod , so I was not the only one that felt the increase in responsiveness . That's all I can say . Ive been running it for over a year now without any issues ( knock on wood)
It's a nice cheap mod in my opinion . |
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02-24-2017, 03:30 PM | #60 |
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I did both of our E9x's almost 3 years ago now. Still waiting for one of them to catch fire and explode because of a "contaminated MAF"....
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05-16-2017, 09:46 AM | #61 |
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most shops will tell you to stick with OEM because they don't know nor support aftermarket stuff and don't want to be held reliable some how if they tell you to use aftermarket filter. They will also tell you to use the "replaceable" when you can since they make money with service and 30% on parts - after all they are in what is that called hmmm..... ohh it's a business to make money
I've been using airintakes and K&N filters since 1998 and never had a problem with the product or an engine. Can you over oil the KN product, yep I've done it on my GTO. If you drain the son of a bitch of course the sensor will get f'ed up the extra oil will be sucked toward the mass air sensor <-- this is simple science folks. Now, using the KN product on a BMW different? Well, I've seen BMW road race teams with K&N filters on 3 and 5 series rides, some are mostly stock just bolt on stuff and some are fully gutted running straight race fuel. The moral of the story is IMO is this, K&N will not produce and sell a product successfully over 30+ years if there is a problem with a huge number of people. |
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05-25-2017, 10:38 PM | #62 |
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This sure is an OLD topic, but gonna add my 2 cents.....I have a drop in K&N with charcoal delete, and the intake scoops. Car is def more responsive and I get just under 30 MPG on straight highway. I've used K&N's forever and have always had good results!
Last edited by Bigrob126; 05-26-2017 at 08:40 AM.. |
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05-26-2017, 12:40 AM | #63 |
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Just do a charcoal delete and run an AFE filter. That's what I got.
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air filter, air intake, k&n vs oem, replace, replacement |
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