[Bklynjoker]

Went to install my BMS intake and saw this valve n extra filter. This is new to me since my "11" X5 N55 didn't have this.

[S1ammin]

Somebody else just asked about that a few weeks ago but I can't remember the answer.

[ezaircon4jc]

Originally Posted by Bklynjoker

Went to install my BMS intake and saw this valve n extra filter. This is new to me since my "11" X5 N55 didn't have this.

My '12 and '14 535i's have it and was wondering the same.

Just checked realoem and the diagram doesn't show the valve...

[Bklynjoker]

Originally Posted by ezaircon4jc

My '12 and '14 535i's have it and was wondering the same.

Just checked realoem and the diagram doesn't show the valve...

Yea man, stopped me from putting the intake on.. seems like this F10 likes to suck a lot of Sht into that Airbox & has that extra filter to protect whatever the hell that is. It Seems sensitive

Just emailed BMS, maybe they have answers

[Bklynjoker]

BMS emails me back with this...

"I don't remember what its used for but it just remains there."

No SHT A$$HOLE... No, I should just rip it out and and say Efffff it.

This valve seems important due to it having double filters for it, intake filter & additional white fish tank filter.

[Bklynjoker]

So being curious I went in deeper. This valve is spring loaded and seems like some kind of purge air release or opens up when air is being sucked in under wide open throttle. I'm able to push it open from under the box, no lines are connect to it

[Bklynjoker]

Video I made to view under box

[ezaircon4jc]

Originally Posted by Bklynjoker

So being curious I went in deeper. This valve is spring loaded and seems like some kind of purge air release or opens up when air is being sucked in under wide open throttle. I'm able to push it open from under the box, no lines are connect to it

DUDE!!!!!! My '14 has that same type of debris in that small section next to the valve!!

[ezaircon4jc]

Picked up my wife's 535i (she needs to drive more to keep the battery charged!) today and asked a tech about the valve. He postulated that it is a valve to protect the engine if the air filter gets clogged. It will bypass the filter letting in "dirty" air which isn't great bit will protect the engine. He said it was very similar to the bypass valve in an oil filter. He said BMW designed many systems to protect the engine.

[paul223]

Originally Posted by ezaircon4jc

Picked up my wife's 535i (she needs to drive more to keep the battery charged!) today and asked a tech about the valve. He postulated that it is a valve to protect the engine if the air filter gets clogged. It will bypass the filter letting in "dirty" air which isn't great bit will protect the engine. He said it was very similar to the bypass valve in an oil filter. He said BMW designed many systems to protect the engine.

Since valve is below the filter (clogged) and engine air intake is above filter, his claim does not make sense. But in general it just provides another opening for intake.


Never mind, tech is correct, I see the shroud wall high enough where it partitions valve area.

[Bklynjoker]

Originally Posted by ezaircon4jc

Picked up my wife's 535i (she needs to drive more to keep the battery charged!) today and asked a tech about the valve. He postulated that it is a valve to protect the engine if the air filter gets clogged. It will bypass the filter letting in "dirty" air which isn't great bit will protect the engine. He said it was very similar to the bypass valve in an oil filter. He said BMW designed many systems to protect the engine.

Yeah I can see this being true, In case some idiot drives thru a flood and blocks the air inlet. The suction from the engine will open that valve to let some kinda breathing. Back in my young Honda days AEM came with the bypass breather between the tubes. Simple but effective

[BMW FOREVER]

So I changed the engine filter on my 2014 535i xdrive but my airbox doesn’t have that valve. Does anyone know what determines if a car has it and why is it necessary?

Mine looks like this