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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Silicone Vacuum Line Replacement



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      06-19-2017, 04:34 PM   #177
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Quote:
Originally Posted by SilverStreak18 View Post
I replaced mine with silicon line and ran it under the intake manifold back to the firewall and then to the brake booster. It makes my engine bay look so much cleaner without that ugly hard line.
I want to do this, where did you connect the silicon line? Any Pics?
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      06-20-2017, 01:38 PM   #178
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Old thread but it has great info. I appreciate this post from back in the day. I printed it up and used it as a blueprint to get all mine swapped out. I used the black 3.5mm from verociousmotorsports.com. Ordered 16ft and have maybe 2ft left over.

To help others, I ended up taking the vacuum canisters off their mounts to make it easier to get the old lines off the bottoms, as I didn't want to snap the nipples off accidentally. That also made it a little easier to get the front wastegate line swapped out. That one and the rear wastegate were definitely the most difficult lines to change due to cramped quarters and angles, but a bit of WD-40 on the inside of the new lines allowed me to slip them on easier.

I also changed the short line coming off the main hard-line on the left side inner fender, and changed out the intake-to-diverter-valve lines too. Altogether took about 3hrs, but well worth the piece of mind, as I had some loose ones, and some hardened ones that would've caused problems eventually. I had to take a sharp blade to all the old lines and a small screwdriver to loosen the ends off the connectors to avoid breaking any nipples. No way did I want to spend extra time fixing broken things.
I did this over the weekend. I spent about 4 hours doing it, replaced 15 lines. Your advice is spot on. I had also picked up a set of picks from Harbor freight (4 piece set, orange handles). It made life easier to pull the lines off after I cut them.

The front wastegate was the hardest for me. I barely was able to stick both of my hands there and could use only the outer sides of both of my fore fingers to get the line over the nipple. I cut out very little bit of material from the inside of the line so that it would go over the nipple. The rear WG wasn't too bad. I was lying across the engine and managed to slip it on after 20 or so mins. I kept the hardened lines as is, replacing the soft lines on each ends.
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      06-29-2017, 07:19 PM   #179
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Has anyone change the ones on top of the head, any advantage of doing so?

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      06-30-2017, 08:41 AM   #180
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Quote:
Originally Posted by Antoans4 View Post
Has anyone change the ones on top of the head, any advantage of doing so?

Ummm...not sure what you're looking for...the advantage will be that you'll have new fresh lines that may not be frayed or worn down attached to the plastic lines???
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      07-01-2017, 09:43 AM   #181
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I just finished most line replacement. I did replace the some of the hard plastic lines too that go from main vacuum tube to boosters. I still need to do the lines to the turbo. Between new tubes, plugs and coil packs and cleaning valves the car is running smooth and strong again. Now I just have to fix my oil filter housing that started to leak again. It must have came loose when I was leaning to clean valves. Overall happy with replacing vacuum lines though!!

Last edited by zooch7; 07-01-2017 at 10:04 AM.
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      07-01-2017, 08:30 PM   #182
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Quote:
Originally Posted by Jklad View Post
Quote:
Originally Posted by Antoans4 View Post
Has anyone change the ones on top of the head, any advantage of doing so?

Ummm...not sure what you're looking for...the advantage will be that you'll have new fresh lines that may not be frayed or worn down attached to the plastic lines???
I would have just run solid line instead of going to the hard plastic lines and then reconnecting. Less breaks in the lines, less connections the better.
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      07-03-2017, 05:09 AM   #183
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So how many of you guys who have replaced the lines have noticed a wastegate rattle improvement ?
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      07-05-2017, 12:55 PM   #184
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Quote:
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So how many of you guys who have replaced the lines have noticed a wastegate rattle improvement ?
Wastegate rattle was not improved in my case, but I think I still have other issues to deal with.
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      07-07-2017, 02:03 PM   #185
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Can we use the verocious 4mm lines?
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      07-07-2017, 04:59 PM   #186
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Just ordered twenty feet of blue 3.5mm line from Verocious Motorsports.

If shipped today. So, probably have it by Tuesday.
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      07-07-2017, 05:54 PM   #187
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Quote:
Originally Posted by mweisdorfer View Post
Just ordered twenty feet of blue 3.5mm line from Verocious Motorsports.

If shipped today. So, probably have it by Tuesday.
Nice. It shipped fast. I did blue as well. Looks good with my titanium silver car and I also painted the engine cover blue.
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      07-07-2017, 05:55 PM   #188
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Quote:
Originally Posted by mweisdorfer View Post
I would have just run solid line instead of going to the hard plastic lines and then reconnecting. Less breaks in the lines, less connections the better.
Thats what I ended up doing.
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      07-08-2017, 01:11 AM   #189
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So only 3.5 mm no 4mm ok guys thanks
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      07-08-2017, 07:21 PM   #190
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Originally Posted by Julian2485 View Post
So only 3.5 mm no 4mm ok guys thanks
Yep, our cars take 3.5mm
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      07-10-2017, 09:49 AM   #191
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I got some silicone vacuum hose but I can squeeze it closed with my fingers easily , it's pretty soft.

Will this be no use ? Do I need a hose that I can't close with my fingers ?
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      07-13-2017, 04:52 AM   #192
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Great thread!

So no one did this with 3mm hoses?
That's the only available hose in Sweden hence with quick and reasonably priced shipping.

The company supplying Koenigsegg with hoses claim that 3mm should work just fine. I think so to, I just don't want it to be too hard squeezing them on..
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      07-13-2017, 08:13 AM   #193
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Quote:
Originally Posted by Fedorov View Post
Great thread!

So no one did this with 3mm hoses?
That's the only available hose in Sweden hence with quick and reasonably priced shipping.

The company supplying Koenigsegg with hoses claim that 3mm should work just fine. I think so to, I just don't want it to be too hard squeezing them on..
3.5mm goes onto most of the nipples pretty easily, so you may be able to squeeze some 3 mm line on. I haven't done the lines to the waste gate yet, which some people say are larger, so I'm not sure about that.
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      07-13-2017, 08:41 AM   #194
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Quote:
Originally Posted by Fedorov View Post
Great thread!

So no one did this with 3mm hoses?
That's the only available hose in Sweden hence with quick and reasonably priced shipping.

The company supplying Koenigsegg with hoses claim that 3mm should work just fine. I think so to, I just don't want it to be too hard squeezing them on..
the front turbo nipple will be a PITA to do with that small of a line, It already is annoying to do with 3.5mm. You should be fine though, If the lines to the diverter valves or BOV look good I would suggest not replacing them with the smaller line, could cause surging issues and or slower response
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      07-13-2017, 08:31 PM   #195
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Anyone here used 4mm on all the lines ?
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