Turbo Vacuum Lines

[SkyLineGtR-R34]

Well I'm doing a project on my own with my 98 galant so I decided to put a 14b on it.
I've got most of the information on how to put it on covered and what goes where, but there's only 1 thing I still don't get: Vacuum lines
Where do you connect the vacuum line comming from the accutator, and where do you connect the one comming from the BOV?

Sorry if this is a repost, I just couldn't find any info when I searched.
Any help would be appreciated.

 

[FORMONTOYA]

the bov goes to a vacuum source on the intake mani, the accuator (wastegate) goes to the nipple off the turbo housing.

jim

 

[alex99gst]

Post number 2 in this thread should help you out.

http://www.dsmtuners.com/forums/showthread.php?t=197385

 

[SkyLineGtR-R34]

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according to this, there is nothing going onto the nipple on turbo housing
i'm talkin about a 14b turbo
so my guess for a setup without mbc would be: BOV to intake, and waste gate acutator to the turbo housing
but if you put the mbc, what do you do with the nipple on the housing, cap it off?

 

[95blackGsTurbo]

14b's don't have nipple's on the housings. If you don't have a mbc you will need to hook the line to some source of pressure. If you are installing a 14b that means you are using a j-pipe. Just install it on the nipple there to run wastegate pressure.

 

[SkyLineGtR-R34]

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that's how my turbo looks right now

the red pipe on the left has a nipple on it, so could I hook up the wastegate to it?

 

[95blackGsTurbo]

Yes. That is what is refered to as a j-pipe.

 

[SkyLineGtR-R34]

ok, got it now
thx a lot man

any suggestions for the mbc, any of them better than others?

 

[92talon720]

Can't you just block them off? which im almost positive is one of the free mods

 

[Quasimondo]

ok, got it now
thx a lot man

any suggestions for the mbc, any of them better than others?

Joe P, Hallman, TurboXS. What you want to look for is a good ball-and-spring unit. Those will provide the quickest amount of spoolup versus some cheap bleeder-valve unit.

If you're going with an electronic boost controller, Greddy's Profec-B is the best bang for the buck, and simplest to use.

 

[SkyLineGtR-R34]

i wanna put in the mbc...so i was wondering which ones are good

so i should go with ball and spring?
i was looking at some voodo mbc's

 

[FORMONTOYA]

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according to this, there is nothing going onto the nipple on turbo housing
i'm talkin about a 14b turbo
so my guess for a setup without mbc would be: BOV to intake, and waste gate acutator to the turbo housing
but if you put the mbc, what do you do with the nipple on the housing, cap it off?

i would not 't' off of the bov line for a pressure source for the mbc/wastegate, but come off the nipple on the 'j' pipe.

jim

 

[SkyLineGtR-R34]

i'm confused a lil' bit now

@FORMONTOYA
should I then just connect the BOV to the intake pipe? and T - off the wastegate,mbc, and j-pipe together

 

[95blackGsTurbo]

i would not 't' off of the bov line for a pressure source for the mbc/wastegate, but come off the nipple on the 'j' pipe.

jim

For a MBC you always tee into the bov return line because it see's vacuum at idle and when you are off the gas. You only run from the wastegate to the j-pipe if you want to run spring pressure of the wastegate. Usually 9-10 lbs.

 

[FORMONTOYA]

For a MBC you always tee into the bov return line because it see's vacuum at idle and when you are off the gas. You only run from the wastegate to the j-pipe if you want to run spring pressure of the wastegate. Usually 9-10 lbs.

i would tend to disagree...

http://dsmtuners.com/forums/showthread.php?t=201894&highlight=MBC post 11 & 13
http://dsmtuners.com/forums/showthread.php?t=204842&highlight=MBC post 3 & 6
http://dsmtuners.com/forums/showthread.php?t=202526&highlight=MBC post 8
http://dsmtuners.com/forums/showthread.php?t=203762&highlight=MBC post 5

plus many others with a search...


jim

 

[FORMONTOYA]

Post number 2 in this thread should help you out.

http://www.dsmtuners.com/forums/showthread.php?t=197385

also look at post 6 and 8

jim

 

[95blackGsTurbo]

In the first post he doesn't have a 14b. He has an upgraded turbo. 14b's don't have nipple's on the compressor housing. Just on the j-pipe and you can't use that for a MBC. In the second one they are refering to a T25 not a 14b. Completely different turbo. If he had a T25 then yes he could do that. In the third one he is trying to boost off of a T25 again PLUS a stock 2g BOV which won't hold the pressure anyways. And in the 4th post they are talking AGAIN about a T25 plus that picture isn't of a 14b or T25 it's an aftermarket Garret. Your move...

 

[95blackGsTurbo]

also look at post 6 and 8

jim

Once AGAIN T25 not 14b. I ran my MBC on my 2g off of the compressor housing. Not the 14b though.

 

[FORMONTOYA]

Just on the j-pipe and you can't use that for a MBC.

please explain the difference between running off of the compressor housing and the 'j' pipe as a pressure source, and why you can use the compressor housing but can not use the 'j' pipe nipple. not trying to be an ass, but i just don't grasp the concept that there is a difference.

jim

 

[95blackGsTurbo]

I honestly couldn't tell you why not but when I tried hooking my MBC up to the j-pipe nipple it wouldn't work at all. Tried both way's and it wouldn't come off of stock boost.

 

[steve]

I honestly couldn't tell you why not but when I tried hooking my MBC up to the j-pipe nipple it wouldn't work at all. Tried both way's and it wouldn't come off of stock boost.

Your problems weren't because of using the nipple on the j-pipe. They are used all the time and it's how mine is installed. I prefer using it over the BOV or intake because the short lengths of hose involved helps cut down on boost spikes.

Steve

 

[95blackGsTurbo]

Thanks steve. I wasn't sure so I thought I would call for backup .

 

[SkyLineGtR-R34]

Your problems weren't because of using the nipple on the j-pipe. They are used all the time and it's how mine is installed. I prefer using it over the BOV or intake because the short lengths of hose involved helps cut down on boost spikes.

Steve

i guess i should just run the bov vacuum line to the intake, and T-off the mbc with j-pipe and wastegate?

 

[FORMONTOYA]

that is correct. bov to intake, 'j' pipe to mbc, mbc to wastegate actuator.

jim