Air Filter Replacement

AK415 · 03-22-2019, 09:48 PM

Quote:

Originally Posted by 328dX

It's all purely for emissions. Since I run a diesel I'm not sure of it's purpose but it does rob power and efficiency. I can't comment on BMWs charcoal media, but from other Japanese brands EE's Subaru (video below) gained 4whp. Which is a lot. Probably close to 10hp at the crank.

BMWs charcoal media doesn't seem as restrictive but I see it as useless nonetheless.

The EPA would rather create pollution (via the media) restrict power and efficiency all in the name of gas fumes(which in several years of running your vehicle) will ultimate burn more fuel due to said restriction. Disgusting

oh I actually watched this before too! Didn't think of that earlier!

Do M sport have a different air intake box than non-M sports? I don't get how mppk and M sports use the filter with carbon but non-M sports doesn't. Unless the software are different to the point the emission output from the same N55 are different...

Billfitz · 03-22-2019, 10:01 PM

Carbon on an air filter makes as much sense as a screen door on a submarine. Activated carbon is used on cabin air filters, to remove odors. I don't think that engines are bothered by smelly air. Not German engines, anyway. French engines, maybe.

328iX · 03-22-2019, 11:13 PM

Quote:

Originally Posted by Billfitz

Carbon on an air filter makes as much sense as a screen door on a submarine. Activated carbon is used on cabin air filters, to remove odors. I don't think that engines are bothered by smelly air. Not German engines, anyway. French engines, maybe.

In gasoline engines it's to absorb/ neutralize gas or exhaust fumes that escape the intake manifold, depending on what stroke the engine was shut off on.

I think you're being sarcastic though lol

Billfitz · 03-23-2019, 08:54 AM

Only a marketeer could come up with that explanation. Even if said fumes managed to make their way backwards to the air filter they'd be cleared within one revolution when the engine started again. They wouldn't be able to make their way out of the air intake to stink up a garage, as that's quite a bit closer to the ground than the intake box. In short:

03-22-2019, 10:01 PM	#46
Billfitz Lieutenant General 8216 Rep 16,052 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Carbon on an air filter makes as much sense as a screen door on a submarine. Activated carbon is used on cabin air filters, to remove odors. I don't think that engines are bothered by smelly air. Not German engines, anyway. French engines, maybe.
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03-23-2019, 08:54 AM	#48
Billfitz Lieutenant General 8216 Rep 16,052 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Only a marketeer could come up with that explanation. Even if said fumes managed to make their way backwards to the air filter they'd be cleared within one revolution when the engine started again. They wouldn't be able to make their way out of the air intake to stink up a garage, as that's quite a bit closer to the ground than the intake box. In short:
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