Charcoal Filter Purpose?

[aboulfad]

BMW LinerGate I promise I'll remove it when the dust settles on this shady practices of BMW! The parts mgr even said you are not supposed to have two filters in each intake box :

[fackamato]

Hey guys is the removal of the filter emissions related only, or is there a difference in sound and/or performance?

Thanks

[aboulfad]

Originally Posted by fackamato

Hey guys is the removal of the filter emissions related only, or is there a difference in sound and/or performance?

Thanks

Definitely emissions related, as to performance, probably minimal, but seems to make a tiny difference coupled with a EuroDME flash.

[fackamato]

Originally Posted by aboulfad

Definitely emissions related, as to performance, probably minimal, but seems to make a tiny difference coupled with a EuroDME flash.

Thanks!

[lemetier]

Originally Posted by aboulfad

Unless that silly charcoal liner comes with the whole intake box which doesnt make sense. Well if BMW's ETK system doesnt show it, and my parts dept doesnt know about, it should not be there

The Hydrocarbon Filter is a part of the airbox. It doesn't exist in ETK by itself. As has been stated, they're for catching blow-by from the CCV and additionally for filtering the Fuel Tank EVAP Ventilation System.

[aboulfad]

Originally Posted by lemetier

The Hydrocarbon Filter is a part of the airbox. It doesn't exist in ETK by itself...

If that is the case, how come ECE and US M4 shows same pn for the intake box, and some ECE owners said it isn't in their intake box?

[lemetier]

Originally Posted by aboulfad

If that is the case, how come ECE and US M4 shows same pn for the intake box, and some ECE owners said it isn't in their intake box?

Same?

ECE:

Intake Right: 13717846268

Intake Left: 13717846269

US/CAN:

Intake Right: 13717847491

Intake Left: 13717847492

[aboulfad]

@lemetier , please read the thread, we just went through this ... my Canadian M4 has parts 268/269 and has the charcoal liner, well using my VIN al least yields that. Post #29.

[lemetier]

Originally Posted by aboulfad

@lemetier , please read the thread, we just went through this ... my Canadian M4 has parts 268/269 and has the charcoal liner, well using my VIN al least yields that. Post #29.

Based off replacement from 04/2017 ETK return. Your government Ratified and Signed CETA in Feb permitting the less expensive ECE replacement assembly. It was assembled new at the factory with 491/2 which include the Hydrocarbon Filters per NA Spec. The US is now the sole oddball out now.

[TropicalF80]

I'm considering removing the charcoal filters on my 2017 F80 and searching for more information regarding results. I found an interesting youtube post from engineering explained comparing before and after results of charcoal filter removal on a subaru crosstrek. Obviously this is a very different engine/car, but to extrapolate, it sounds like mild HP and TQ gaines might be expected. That being said, any "butt dyno" perceived gains are likely to be negligible.

Last post on this thread was some time ago and I'm wondering if anyone has had any emissions/warranty issues following removal of these filters. I'm guessing this might be an issue in some states more than other (i.e. California, a state from which I am a resident emeritus ).

[SenorRoadRage]

Originally Posted by fackamato

Hey guys is the removal of the filter emissions related only, or is there a difference in sound and/or performance?

Thanks

Not worried about performance, but I'd like to hear what the "ear dyno" charts say.

[JD1100]

anyone have any updates on this? I'm probably going to pull mine out and see what happens. If its somehow worse, I'll put them back in.

[Taco_Bueno]

Originally Posted by JD1100

anyone have any updates on this? I'm probably going to pull mine out and see what happens. If its somehow worse, I'll put them back in.

I removed mine immediately. Little more noticeable turbo spool noise but no difference aside that.

I thought their only purpose was to help contribute to landfills?

[Kossos]

Originally Posted by JD1100

anyone have any updates on this? I'm probably going to pull mine out and see what happens. If its somehow worse, I'll put them back in.

They are there to absorb crankcase gasses that vent after you turn the car off. They do nothing when the car is running and removing them has no gains other than turbo/intake sound. I took them out when I upgraded to BMC panel filter.

[CanAutM3]

Originally Posted by Kossos

They are there to absorb crankcase gasses that vent after you turn the car off. They do nothing when the car is running and removing them has no gains other than turbo/intake sound. I took them out when I upgraded to BMC panel filter.

Dyno tests have confirmed that just removing the charcoal filters with the stock air filters provides practcally the same power gains as aftermarket air filter.

[SteveYem]

Originally Posted by Taco_Bueno

I removed mine immediately. Little more noticeable turbo spool noise but no difference aside that.

I thought their only purpose was to help contribute to landfills?

Originally Posted by Kossos

They are there to absorb crankcase gasses that vent after you turn the car off. They do nothing when the car is running and removing them has no gains other than turbo/intake sound. I took them out when I upgraded to BMC panel filter.

Bumping this old thread and quoting these two posts to ask for additional confirmation and/or anecdotal input from others: If I remove the charcoal filters and leave the stock air filters in place, will I hear additional turbo noise?