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      10-11-2018, 12:30 PM   #1
eyehategod
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N55 Vacuum Lines/Hoses Replacement

Hey all, does anyone have a solid DIY on this? I have the Bentley manual and can't really find it, and all of the DIYs I'm seeing for this are on the N54, which has quite a different vacuum system from what I understand. I've replaced my boost solenoid and I know that two vacuum lines run off of that unit, so I can follow those lines and replace them. Are there others I should be looking for?
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      10-11-2018, 07:47 PM   #2
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Quote:
Originally Posted by eyehategod View Post
Hey all, does anyone have a solid DIY on this? I have the Bentley manual and can't really find it, and all of the DIYs I'm seeing for this are on the N54, which has quite a different vacuum system from what I understand. I've replaced my boost solenoid and I know that two vacuum lines run off of that unit, so I can follow those lines and replace them. Are there others I should be looking for?
I asked myself your exact question. After plugging in the last seven of my VIN on realoemdotcom, I replaced the least expensive and most likely failure points i.e. the rubber composite tubing. The hose/tubing develops both memory brittleness after a few years of exposure to heat, etc. that makes reusing/reattaching the tubing without leakage (e.g. turbo to valve cover) questionable.
I have not come across a dedicated DIY for the N55 platform.

Mike
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      10-12-2018, 04:47 AM   #3
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Ive just replaced mine and could do a diy
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      10-12-2018, 11:20 AM   #4
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Quote:
Originally Posted by TonyTony View Post
Ive just replaced mine and could do a diy
This would be super helpful!

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Originally Posted by cranelec View Post
I asked myself your exact question. After plugging in the last seven of my VIN on realoemdotcom, I replaced the least expensive and most likely failure points i.e. the rubber composite tubing. The hose/tubing develops both memory brittleness after a few years of exposure to heat, etc. that makes reusing/reattaching the tubing without leakage (e.g. turbo to valve cover) questionable.
I have not come across a dedicated DIY for the N55 platform.

Mike
So these lines are different than the ones that run off of the boost solenoid?
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      10-13-2018, 03:49 PM   #5
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Quote:
Originally Posted by eyehategod View Post
Quote:
Originally Posted by TonyTony View Post
Ive just replaced mine and could do a diy
This would be super helpful!

Quote:
Originally Posted by cranelec View Post
I asked myself your exact question. After plugging in the last seven of my VIN on realoemdotcom, I replaced the least expensive and most likely failure points i.e. the rubber composite tubing. The hose/tubing develops both memory brittleness after a few years of exposure to heat, etc. that makes reusing/reattaching the tubing without leakage (e.g. turbo to valve cover) questionable.
I have not come across a dedicated DIY for the N55 platform.

Mike
So these lines are different than the ones that run off of the boost solenoid?
Both of the following: Part # 11657605416 is a very short vacuum hose and part #11657588773 is a much longer hose encased in a braided heat shielding material emanating from the pressure converter. The two diagrams above give you a starting point to locate leaks.
If you've already replaced those two lines, obviously the short non-insulated tubing runs to the valve cover. Accordingly, next to the short tube connection point on the valve cover, a longer piece of tubing exits your valve cover and is initially anchored to the bracket that secured both O2 sensors.
Does your car have a golf tee mod?
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      10-14-2018, 05:18 PM   #6
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Quote:
Originally Posted by cranelec View Post
Both of the following: Part # 11657605416 is a very short vacuum hose and part #11657588773 is a much longer hose encased in a braided heat shielding material emanating from the pressure converter. The two diagrams above give you a starting point to locate leaks.
If you've already replaced those two lines, obviously the short non-insulated tubing runs to the valve cover. Accordingly, next to the short tube connection point on the valve cover, a longer piece of tubing exits your valve cover and is initially anchored to the bracket that secured both O2 sensors.
Does your car have a golf tee mod?
The one encased in a braided heat shield - does that need to be replaced with an OEM one? I ordered about 15' of vacuum hose and was planning on replacing everything with that. It does have a "golf tee" mod, I unplugged in the trunk.
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Last edited by eyehategod; 10-14-2018 at 09:23 PM.
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      10-21-2018, 02:25 AM   #7
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N55 is easy to do and honestly doesn't require much guidance. Almost everything is visible and possible with a bit of creativity and care (cut off the old hose rather than trying to wrestle them off and break nipples)
The N55 vacuum plumbing is far less susceptible to damage/ageing than the N54.

If you have done the golf tee mod then cap off the feed at the rocker cover instead.

The hardest part is the long hose from the wastegate solenoid to the wastegate actuator and this is the one where creativity really helps.

The hose which i always find the most concerning is the short one from the rocker cover to the wastegate solenoid. It is almost always stiff and feels too easy to slide off. Sometimes the rubber joiner on the plastic line between the vacuum pump and the rocker cover id also a bit loose so a suitable spring clamp may give some more peace of mind. Just remember it is a vacuum system so the whole thing should suck together tighter and nothing will blow off.

I used BMW vacuum hose as I had heaps spare from another job. It used to come in 5m rolls.
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      10-23-2018, 12:49 PM   #8
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Also looking forward to that DIY. I don't see many but I do see that hard line going across the engine bay.
I found the braided cloth like vacuum line going down towards the turbo but I can really see where it goes past the thermostat.

I'm assuming it goes to the black nipple (heh) near the front of the turbo in this pic by the wastegate. Looks like fun to get to.
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      10-23-2018, 06:42 PM   #9
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Quote:
Originally Posted by Rotorocious View Post
Also looking forward to that DIY. I don't see many but I do see that hard line going across the engine bay.
I found the braided cloth like vacuum line going down towards the turbo but I can really see where it goes past the thermostat.

I'm assuming it goes to the black nipple (heh) near the front of the turbo in this pic by the wastegate. Looks like fun to get to.
That braided vacuum line should go right to the nipple on the wastegate. Pretty sure that the "nipple" you are looking at is a stud for the inlet pipe.
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      10-23-2018, 08:47 PM   #10
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Quote:
Originally Posted by rich_mane View Post
That braided vacuum line should go right to the nipple on the wastegate. Pretty sure that the "nipple" you are looking at is a stud for the inlet pipe.
Ah that makes way more sense. Thank you. Hopefully its easier to reach. I don't really see where the DV vacuum line would go on any diagrams. I'm sure its pretty crusty by now too

Last edited by Rotorocious; 10-23-2018 at 08:52 PM.
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      10-23-2018, 10:01 PM   #11
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Ah that makes way more sense. Thank you. Hopefully its easier to reach. I don't really see where the DV vacuum line would go on any diagrams. I'm sure its pretty crusty by now too
No vacuum line to the DV, it's electronically operated. Wastegate is easier to reach from underneath the car I think.
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      10-24-2018, 12:39 PM   #12
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Quote:
Originally Posted by juld0zer View Post
N55 is easy to do and honestly doesn't require much guidance. Almost everything is visible and possible with a bit of creativity and care (cut off the old hose rather than trying to wrestle them off and break nipples)
The N55 vacuum plumbing is far less susceptible to damage/ageing than the N54.

If you have done the golf tee mod then cap off the feed at the rocker cover instead.

The hardest part is the long hose from the wastegate solenoid to the wastegate actuator and this is the one where creativity really helps.

The hose which i always find the most concerning is the short one from the rocker cover to the wastegate solenoid. It is almost always stiff and feels too easy to slide off. Sometimes the rubber joiner on the plastic line between the vacuum pump and the rocker cover id also a bit loose so a suitable spring clamp may give some more peace of mind. Just remember it is a vacuum system so the whole thing should suck together tighter and nothing will blow off.

I used BMW vacuum hose as I had heaps spare from another job. It used to come in 5m rolls.
Hey thanks for this post, really appreciate it. A little lost (I'm a complete noob), as I thought the wastegate solenoid and the wastegate actuator were the same thing? The only vacuum lines I could easily and visibly see were the two that run off of the solenoid, and one of my lines had a very big and visible gash in it that I noticed when I replaced the solenoid, so I know that I need to replace these. My question was if there are other vacuum lines outside of those two?

Also as far as the golf tee mod - can you explain that a little further? I'm not using a golf tee, I've got the cable for the exhaust flap disconnected in the trunk, I haven't done anything else besides that.
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      10-25-2018, 04:14 AM   #13
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Solenoid is the electronic device which controls the vacuum applied to the wastegate actuator to close the wastegate and generate boost. Our cars' wastegates are controlled in the opposite manner to most turbos.
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      11-02-2018, 08:43 AM   #14
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I replaced my vac line that connects to the Westgate , Glad I did that braided line was on its way out. Also if you do replace it try to re-route it from the massive heat
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