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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > charcoal filter delete



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      02-07-2012, 04:11 PM   #1
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charcoal filter delete

What is a "charcoal filter delete"?

Someone had it listed as a "Mod".
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      02-07-2012, 04:46 PM   #2
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I believe it's the cabin A/C microfilter. I wonder if he replaced the charcoal-activated version with a (less effective) standard filter or removed it entirely? Either way that seems like an odd mod.
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      02-07-2012, 04:58 PM   #3
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its in your intake apparently its very restrictive on airflow do a search there is a lot on the subject
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      02-07-2012, 05:20 PM   #4
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It's in the engine intake, not the micro filter! In the engine intake the air goes through the paper filter AND a carbon filter that is highly restrictive. We ( I have done this) just cut the carbon filter out and voila!
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      02-07-2012, 06:10 PM   #5
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There are no gains by the way. At least that was the general consensus after reading the threads about it.
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      02-07-2012, 06:11 PM   #6
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My fuel economy was oddly increased.
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      02-09-2012, 08:09 PM   #7
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I also saw a mpg increase. Maybe some power increase but could be the placebo effect.

There is a DIY on the site for it.
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      07-28-2012, 11:43 AM   #8
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I did this today. Low end seems smoother/less staggered in its power delivery. While moving 70+ in 6th there is a slight increase in power.

It was definitely worth the hour it took me. It was also nice getting to know more and more about the car itself.

I did the K&N Drop in + Charcoal Delete.
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      07-28-2012, 01:00 PM   #9
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Quote:
Originally Posted by Asiana Jones View Post
I did this today. Low end seems smoother/less staggered in its power delivery. While moving 70+ in 6th there is a slight increase in power.

It was definitely worth the hour it took me. It was also nice getting to know more and more about the car itself.

I did the K&N Drop in + Charcoal Delete.
I picked upa K & N for $25 shipped so I will be doing this soon to.

Not really looking for anything but a little bit different exhaust sound
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      07-28-2012, 06:20 PM   #10
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Quote:
Originally Posted by Asiana Jones View Post
I did this today. Low end seems smoother/less staggered in its power delivery. While moving 70+ in 6th there is a slight increase in power.

It was definitely worth the hour it took me. It was also nice getting to know more and more about the car itself.

I did the K&N Drop in + Charcoal Delete.
should get the cyba intake scoops too
i have charcoal delete + k&n drop in filter + scoops and i find lower end power is much much better (could be placebo) but one thing for sure is my fuel econ went up. was averaging 13.6L/100km but now im getting around 12.7(yea thats a lot but thats cause i beat my car)
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      07-29-2012, 09:20 PM   #11
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I couldnt tell a difference doing it, but in theory it makes sense.

The stupid part about the whole 'charcoal filter' is that supposedly it removes impurities allowing the combustion to be cleaner. B.S. Maybe when the thing is new, but any activated charcoal filter quickly absorbs and becomes saturated with the stuff they are supposed to remove. Then they are useless. And this 'filter' is not servicable. Just dumb.
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      07-29-2012, 09:26 PM   #12
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Oh, and if you do remove it. Use a very sharp blade to cut it out. I used a dremel with sanding drum to clean up the edge. Remove the MAF while doing this, and clean that whole filter housing half thoroughly before re-assembling. Its got this fine dust of charcoal that could contaminate the MAF.
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      07-31-2012, 06:14 AM   #13
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Oddly enough, I was averaging 21.5 Miles to the gallon. Now I am averaging 27.8 Miles to the gallon. I've driven the car roughly 500 miles since I did the delete.

If anything, I am exceptionally happy about that.

And Cyba Scoops are next. If not for performance, I love the way they look.
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      07-31-2012, 07:05 AM   #14
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Quote:
Originally Posted by monza2t View Post
I couldnt tell a difference doing it, but in theory it makes sense.

The stupid part about the whole 'charcoal filter' is that supposedly it removes impurities allowing the combustion to be cleaner. B.S. Maybe when the thing is new, but any activated charcoal filter quickly absorbs and becomes saturated with the stuff they are supposed to remove. Then they are useless. And this 'filter' is not servicable. Just dumb.
The filter stops fuel fumes from exiting the engine when it is off. It is part of the emissions equipment of your car. Any fuel in the filter would be released and pulled into the engine when air started flowing throough it. Filter would never become clogged.
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      07-31-2012, 07:08 AM   #15
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Quote:
Originally Posted by Asiana Jones View Post
Oddly enough, I was averaging 21.5 Miles to the gallon. Now I am averaging 27.8 Miles to the gallon. I've driven the car roughly 500 miles since I did the delete.

If anything, I am exceptionally happy about that.

And Cyba Scoops are next. If not for performance, I love the way they look.
Delete did not do this. You probably reset your mileage calculator, and it just hasn't averaged down yet.
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      07-31-2012, 07:12 AM   #16
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Quote:
Originally Posted by mthomas View Post
Delete did not do this. You probably reset your mileage calculator, and it just hasn't averaged down yet.
Eh, I've reset my counter many times. I have NEVER had more than 24mpg. Not even close. Additionally, I have driven 500 miles, with air conditioning, in the city, and on the highway and am averaging over 27mpg after the delete.
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      07-31-2012, 08:19 AM   #17
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Quote:
Originally Posted by mthomas View Post
The filter stops fuel fumes from exiting the engine when it is off. It is part of the emissions equipment of your car. Any fuel in the filter would be released and pulled into the engine when air started flowing throough it. Filter would never become clogged.
Charcoal becomes clogged, and does so at a pretty quick rate. The charcoal filter in our air intakes may not get clogged quickly because the rate of air leaking out into the air intake is probably very very small, and the fuel it carries even smaller. I'd be more concerned about the charcoal filter filling up with chemicals from exhaust fumes on the road.

Either way, they (generally) will not filter and then release again, they're very good adsorbers. The filter would have to be pretty full to be able to release back into the engine again. Most of the time, carbon filters are one-time-use because they're not designed to take and release, they're designed to only adsorb until full, and then replace. Hence why people say it's stupid that we've got a one-time-use filter in our intakes that isn't serviceable other than replacing the entire intake box.

I suspect that the removal of the filter has an impact based solely on it being a restrictive filter, and the older it is, the more crap that is in it and stays in it, since again, it's not going to release the particles it's captured until it's more or less entirely full.
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      07-31-2012, 08:25 AM   #18
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So is does the 335 have this filter or is it something that the non turbo motors have ?
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      07-31-2012, 08:31 AM   #19
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This is the mod you do when you want to smell the diesel fumes of the truck in front of you.
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      07-31-2012, 10:00 AM   #20
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Quote:
Originally Posted by upstatedoc View Post
This is the mod you do when you want to smell the diesel fumes of the truck in front of you.
Does not help with what I asked but okay
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      07-31-2012, 03:32 PM   #21
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Quote:
Originally Posted by mthomas View Post
The filter stops fuel fumes from exiting the engine when it is off. It is part of the emissions equipment of your car. Any fuel in the filter would be released and pulled into the engine when air started flowing throough it. Filter would never become clogged.
This is not an official part of the emissions controls, its one of those gimmicky things like Volvo's catalytic radiator.

Activated charcoal certainly does hold on to pollutants. You have to have a thermal reactivation to release the crap that it holds onto. You arnt going to get that in the air filter box. And at a rate of 3L of air every other revolution, there is ~3600L of air flowing past it at 60mph in 1mile. Its not going to last long as an 'emissions device'
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      08-01-2012, 07:58 AM   #22
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Quote:
Originally Posted by upstatedoc View Post
This is the mod you do when you want to smell the diesel fumes of the truck in front of you.
Why would you smell the diesel fumes of the truck in front of you if you remove the carbon filter on the intake to the engine? Cabin air has a totally separate air intake system, rough and carbon filters, of it's own.
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