Vacuum hose inner diameter for 335i various applications

NashvegasR · 07-24-2013, 02:31 PM

Hey gang - I've searched and see different replies.

What is the correct inner diameter hose for the OEM BMW vac hoses under the hood on a 335i N54 (2007).

It's 3.0 (inner diameter), right?

I ask because ECS shows it as 3.5 on a few diagrams, other people say 2.5 on the forums. I want to repalce with exactly stock which I believe is BMW PN 51711470035 (for 1 meter of the stuff)

THANKS THANKS

Snaggletooth · 07-24-2013, 03:51 PM

Get some turbosmart 3mm silicone hoses, you'll be good to go. The stock ones deteriorate rapidly and are not suitable for the application. This is a known source of boost leaks. For areas near the turbos, the line seems to have some kind of insulation however, so i'd look into insulating any lines near the turbos.

NashvegasR · 07-31-2013, 08:16 PM

Thanks btw - appreciate the reply.

07-24-2013, 02:31 PM	#1
NashvegasR Lieutenant 174 Rep 532 Posts Drives: 2016 M4 F83 Join Date: Dec 2012 Location: Portland, OR iTrader: (4)	Vacuum hose inner diameter for 335i various applications Hey gang - I've searched and see different replies. What is the correct inner diameter hose for the OEM BMW vac hoses under the hood on a 335i N54 (2007). It's 3.0 (inner diameter), right? I ask because ECS shows it as 3.5 on a few diagrams, other people say 2.5 on the forums. I want to repalce with exactly stock which I believe is BMW PN 51711470035 (for 1 meter of the stuff) THANKS THANKS
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07-24-2013, 03:51 PM	#2
Snaggletooth General Nuisance 25 Rep 277 Posts Drives: 2007 E92 335i Join Date: Oct 2012 Location: Orange County, CA iTrader: (0)	Get some turbosmart 3mm silicone hoses, you'll be good to go. The stock ones deteriorate rapidly and are not suitable for the application. This is a known source of boost leaks. For areas near the turbos, the line seems to have some kind of insulation however, so i'd look into insulating any lines near the turbos. __________________ '07 E92 335i 6MT Full Bolt On's, Vargas Stage 2's, Carbon Fiber, and Methanol.
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07-31-2013, 08:16 PM	#3
NashvegasR Lieutenant 174 Rep 532 Posts Drives: 2016 M4 F83 Join Date: Dec 2012 Location: Portland, OR iTrader: (4)	Thanks btw - appreciate the reply.
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