Charcoal Filter Purpose?

[aboulfad]

Originally Posted by Celestion

liner (0.095kg) + right "EU" airbox, presumably linerless (0.99kg) = 1.085 kg

"NA" airbox = 1.170kg

So the EU airbox with the liner weight added to it, is about equal to the NA airbox alone. This seems like a good approach to me. Maybe I'm not understanding something fundamental lol.

I entered my VIN, and it shows pn 13717846268 which weighs 0.99Kgs, 13717846269 weighs 1.4Kgs, what does you car VIN give you ? maybe my car is an ECE config

[horsepower_and_hounds]

Take them out, throw away and forget you even seen them. Did it on my 128, M235 and M4

[Celestion]

Originally Posted by aboulfad

So choose 268/269 not 268/491, and then you'll see that ECE/US for the consecutive pn are the same weight.

Ok so I made a matrix that applies to the M3LCI (F80N) and all M4 models (ETK data):

                     
            Left airbox (P/N)     Right airbox (P/N)
NA only ------1.550kg (492) -------- 1.170kg (491)
EU/NA --------1.400kg (269) -------- 0.990kg (268)

In all regions, the left airbox has an intake manifold built into the unit itself, whereas the right airbox does not, hence the weight differences between columns. I'm attributing the weight differences between rows, to the presence or absence of the carbon liner in the NA and EU regions respectively.

Edit: fixed matrix error

[aboulfad]

Originally Posted by Celestion

.. I'm attributing the weight differences between rows, to the presence or absence of the carbon liner in the NA and EU regions respectively.
...

ok thanks for the table which basically summarizes what i said few posts ago. My car's VIN shows that I have pn 268/269, does that mean there are differences between Canada and USA ? we don't have the charcoal liner neither, so it seems that only USA has the charcoal liner because if maybe CA strict emissions laws!

From this post onwards http://f80.bimmerpost.com/forums/sho...9&postcount=45 similar discussion, and some ECE owners confirmed no charcoal liner, and tom @ eas said ETK doesn't show it, so there's probably something wrong I was doing in ETK as I can't find it for my car.

CanAutM3 can you please run your VIN in etkbmw.com (section 13_1612) and report your pn(s) svp ? merci !

[aboulfad]

Originally Posted by CaryTheLabelGuy

... Those charcoal filters are there to stop the .000001% that might make it to the atmosphere...

Can you please explain how they make it all the way up to the charcoal filter, the crankcase ventilation pipe is connected at the bottom of the left intake muffler, is it that those particles float their way up because they are less dense than air that is going in opposite direction?

[CaryTheLabelGuy]

Originally Posted by aboulfad

Can you please explain how they make it all the way up to the charcoal filter, the crankcase ventilation pipe is connected at the bottom of the left intake muffler, is it that those particles float their way up because they are less dense than air that is going in opposite direction?

A condition where PCV could make its way back up the intake pipe and up to the charcoal filter is probably most-likely during engine shut-down and the moments thereafter.

However, the S55 doesn't have a Diverter Valve (AKA blow-off valve) to recirculate boost when the throttle plate closes. For the S55, the engine re-uses some of the excess boost for Anti-Lag (ALS) reasons and also re-uses the excess boost pressure to pre-load the turbos (among other things) and it does all of this as well as boost control at the plenum, by leveraging the Throttle Plate. Because this is a Valvetronic engine, most traditional "throttle" duties are handled by Valvetronic using variable intake valve lift instead of using the actual throttle plate. The actual throttle plate is used for boost control at the plenum (boost the engines actually sees), ALS, to pre-load turbos...etc. Because of how the throttle plate manages these different conditions, boost can back up into the system and may cause a situation where PCV could make its way up to the charcoal filters.

[aboulfad]

Absolutely most confusing part I came across... so my car CAN model with air filter elements pn 268/269 has the darn charcoal liner!!! See pic. I took apart the passenger side (thankfully BMW is using screws that stay in place)

So the weight theory doesn't hold water anymore :

[Celestion]

Originally Posted by aboulfad

Absolutely most confusing part I came across... so my car CAN model with air filter elements pn 268/269 has the darn charcoal liner!!! See pic. I took apart the passenger side (thankfully BMW is using screws that stay in place)

So the weight theory doesn't hold water anymore :

Damn.

This was fun lol

[horsepower_and_hounds]

It's prolly a 50 state emissions thing like the secondary cats. When I would park the car after driving and the carbon filters were installed I could not smell much fumes from the front of the car....now that they are disposed of there is a bit more aroma. Kind a like the carbon on some cabin air filters....suppoded to decontaminate the air prior to entering the cabin

[aboulfad]

Originally Posted by Celestion

Damn.
This was fun lol

I just called my parts dept, they did a thorough search and couldn't find anything, so now I am emailing them a picture an they will follow up with BMW. At least we know we aren't that stupid ;-)

[Celestion]

Originally Posted by ehagerty

It's prolly a 50 state emissions thing like the secondary cats. When I would park the car after driving and the carbon filters were installed I could not smell much fumes from the front of the car....now that they are disposed of there is a bit more aroma. Kind a like the carbon on some cabin air filters....suppoded to decontaminate the air prior to entering the cabin

I actually noticed that too. It went away after a couple of drives for me. I think the DME was just learning what it's like to breathe again

[Celestion]

Originally Posted by aboulfad

I just called my parts dept, they did a thorough search and couldn't find anything, so now I am emailing them a picture an they will follow up with BMW. At least we know we aren't that stupid ;-)

Cool. Looking forward to solving the euro liner thing for good.

[aboulfad]

Originally Posted by ehagerty

It's prolly a 50 state emissions thing....suppoded to decontaminate the air prior to entering the cabin

decontaminate the atmosphere not just your cabin

[aboulfad]

Originally Posted by Celestion

Cool. Looking forward to solving the euro liner thing for good.

I mean we know now that it exists on US/CAN cars (and I learnt of its existence in general), but the whole part nbs is completely confusing and does NOT make any sense, so maybe its a conspiracy from BMW

Though really removing them is a pain in the rear, taking out so many parts and the CF brace to get to them, come on BMW !!!

[horsepower_and_hounds]

Originally Posted by aboulfad

I mean we know now that it exists on US/CAN cars (and I learnt of its existence in general), but the whole part nbs is completely confusing and does NOT make any sense, so maybe its a conspiracy from BMW

Though really removing them is a pain in the rear, taking out so many parts and the CF brace to get to them, come on BMW !!!

Yea but the brace takes 3 min or so....really easy. Just did it so I could reach down and plug in my JB4 ewg wires

[aboulfad]

Originally Posted by ehagerty

Yea but the brace takes 3 min or so....really easy. Just did it so I could reach down and plug in my JB4 ewg wires

ok its all the parts, screws, plastic liners, covers ... its not a difficult job, maybe I am just lazy :-) I was going to follow suite as Celestion and flash ECE DME but too lazy to take apart all those parts so I can remove the elusive charcoal liners. Maybe when I change the air filters, then I'll do it at the same time.

BTW, hope you ALL properly torqued your screws to 28Nm ! ISTA says to renew screws... (never understood why for normal screws, stretch bolts yes)

[horsepower_and_hounds]

Originally Posted by aboulfad

ok its all the parts, screws, plastic liners, covers ... its not a difficult job, maybe I am just lazy :-) I was going to follow suite as Celestion and flash ECE DME but too lazy to take apart all those parts so I can remove the elusive charcoal liners. Maybe when I change the air filters, then I'll do it at the same time.

BTW, hope you ALL properly torqued your screws to 28Nm ! ISTA says to renew screws... (never understood why for normal screws, stretch bolts yes)

Yep 20 ft lb

[Celestion]

Originally Posted by aboulfad

ok its all the parts, screws, plastic liners, covers ... its not a difficult job, maybe I am just lazy :-) I was going to follow suite as Celestion and flash ECE DME but too lazy to take apart all those parts so I can remove the elusive charcoal liners. Maybe when I change the air filters, then I'll do it at the same time.

BTW, hope you ALL properly torqued your screws to 28Nm ! ISTA says to renew screws... (never understood why for normal screws, stretch bolts yes)

Before taking out the filters myself, I also thought that removing the strut and covers and stuff was going to be a major PITA. It wasn't half as bad as I thought it would be though! I say go for it!

About the torque specs, I had to wing it.... I'll have the BMW techs check it next service interval. Glad I saw this.

[horsepower_and_hounds]

Originally Posted by Celestion

Before taking out the filters myself, I also thought that removing the strut and covers and stuff was going to be a major PITA. It wasn't half as bad as I thought it would be though! I say go for it!

About the torque specs, I had to wing it.... I'll have the BMW techs check it next service interval. Glad I saw this.

Good n tight is over 20 ft lb FYI......

[ptper]

Originally Posted by aboulfad

BTW, hope you ALL properly torqued your screws to 28Nm ! ISTA says to renew screws... (never understood why for normal screws, stretch bolts yes)

Some will even reuse stretch bolts, but I that is where I draw the line, lol.

[aboulfad]

Originally Posted by Celestion

Cool. Looking forward to solving the euro liner thing for good.

The parts mgr replied, and he said he found absolutely nothing, and he even showed the pics to the techs and they said they have never seen it, he said probably they forgot to remove the charcoal liner

Maybe you can call your parts dept and check. It's looking like BMW sneaked in a charcoal liner, wait is this BMWGate (like VW DieselGate)

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

[Celestion]

Originally Posted by aboulfad

The parts mgr replied, and he said he found absolutely nothing, and he even showed the pics to the techs and they said they have never seen it, he said probably they forgot to remove the charcoal liner

Maybe you can call your parts dept and check. It's looking like BMW sneaked in a charcoal liner, wait is this BMWGate (like VW DieselGate)

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

Fascinating! Yep, we've discovered BMW LinerGate . Maybe they were supposed to remove the liner when your car arrived at the Canadian port? Who knows at this point... I'll be curious about whatever changes you may perceive when you remove the liner and flash the Euro swfl.