n54 Vacuum Line Diagram Request - Bimmerfest - BMW Forums

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Old 07-07-2014, 08:35 AM
endlessbummer endlessbummer is offline
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Location: Brambleton, VA
Join Date: Aug 2013
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Mein Auto: 2008 E90 6-speed
n54 Vacuum Line Diagram Request

I am trying to clarify how my [our] car's turbo vacuum lines are run vs how they should be. I have found some parts diagrams across the web, but would prefer to get details from someone first hand.

Can someone(s) with a bone stock n54 335i confirm that this diagram is the proper factory plumbing route? I have pulled this from a forum discussing a 2008 135i n54 which I have to imagine is the same, but again, I want to assume nothing.

It appears that both canisters [#1] are going to their respective solenoids [#4] then T'ing into a single line to both turbos.

In my case the solenoid closest to the back is capped off with nipples and not being used, while the left canister is T'ed directly into the single line to the turbos. I've been talking to the PO and he never messed with them and could not give me insight.

Thanks in advance.
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Old 07-07-2014, 09:28 AM
Zooks527's Avatar
Zooks527 Zooks527 is offline
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Location: Mansfield, MA
Join Date: Mar 2009
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Mein Auto: 2015 M235xi / 2005 Tacoma
Each of my canisters goes to its respective converter. The converters are T-ed together, and then run out to the turbos, as above. Bizarre design: double the parts, double the tubes, just so everything can be linked together with more pieces that can fail or leak (unless it's to provide some redundancy in the reservoir / converter section).

The drawing above is pretty much a match to the realoem diagram for my car's 4/2009 build date: http://www.realoem.com/bmw/showparts...75&hg=11&fg=45

You can go to the realoem.com start page and work your way to the diagram for your build date. I would expect it's pretty much the one above.
2015 M235xi coupe, Black Sapphire Metallic, Black Leather, Fineline Stream trim, Steptronic, xDrive, ZPP, ZTP, ZCW, ZDA, ZDB, 5DP, hk w/ BimmerTech amp, Enh. BT
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Last edited by Zooks527; 07-07-2014 at 09:37 AM.
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