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      10-21-2018, 01:25 AM   #7
juld0zer
Lieutenant Colonel
Australia
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Drives: Prev 135i 7DCT, Now 130i 6sp
Join Date: Jul 2016
Location: 2153

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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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