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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Air Filter Dyno Testing - Round 2 - K&N vs Helene vs ITG vs BMC vs BMS vs Stock

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      07-09-2009, 12:01 AM   #67
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Originally Posted by carve View Post
Oh- well due to the charcoal filter, you may well see a noticable improvement. I'd probably go with an aftermarket paper filter with no charcoal layer instead though (e.g. NAPA gold). That engine is too damn expensive to let extra dust in for little to no gain.
Yes, the prevailing theory is that the charcoal layer is constricting a little. Your theory about paper being superior to oiled substrate is just a theory. I'm not worried about this filter damaging my expensive engine.

THE superior filter is actually made out of something called nonwoven textiles. I worked as a consultant to a company that made such filters for Toyota. NWT was used because the density of the open space can be controlled to a very tight specification. It had "good" flow characteristics and very high filtration levels.

BTW, people that compete and use oiled filter elements clean and reoil the filter regularly. Your theory that they will end up more stopped up is also just another theory. In actual fact it will depend on how often the owner cleans and oils it.

I DO agree that for the 335i and probably the 135i, there's no significant gain to be had.

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      07-09-2009, 12:47 AM   #68
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It is a theory- one backed up by experimental data.
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