MBC install [Merged 10-7]

[b00sted99-X]

HERE, DAMMIT!

http://www.dsmtuners.com/forums/showthread.php?t=237982


ok n00b question here.. i got my MBC all hooked up fine (dejon tool.. sweet!) i'm just wondering what to do with the stock boost solenoid hoses.. i took the top one completely off (this is the one that was going to my intake pipe.. then capped that nipple on the pipe) .. the one on the bottom, that tees off and goes to both the wastegate and the turbo housing, is still there. i just bent it backwards and stuck it in the bracket that the top hose was at.. its still connected to the solenoid though. is this alright? can i leave it on there like that will it screw anything up?

 

[pitbullowner_2]

When hooking up my mbc do i take out that plug that has two hoses coming out of it and cap off where those two hoses went to??? so then the mbc is hooked up to the bov line and to the wastegate and thats it?

 

[ECLIPSEGST25]

you could just unplug the solenoid the hoses go hooked up to, and just run 1 line connecting the wastegate and the turbo. cut in half and put the mbc in the middle. hope this link helps.

http://www.turboxs.com/faq/tyrboxsstd.htm

 

[pitbullowner_2]

do i need the hoses or can i just take them off and run my own line fron the wg to the mbc for a shorter route...this is how i did it: but i was just wondering if i needed that plug

http://www.dsmtuners.com/forums/showthread.php?t=220269&highlight=mbc+install

 

[ECLIPSEGST25]

Do It Just Like The Link I Sent You.run Your Own Line From The Wg To The Mbc And From The Mbc To The Turbo. That Whole Bov Set Up Sucks

 

[pitbullowner_2]

alright thanks man

 

[daveyfx]

Do It Just Like The Link I Sent You.run Your Own Line From The Wg To The Mbc And From The Mbc To The Turbo. That Whole Bov Set Up Sucks

Please don't follow his recommendation. Follow the link that you pasted instead, also available here: http://www.dsmtuners.com/forums/showthread.php?t=105573

There is also a full explanation in the posted link as to why you should tap into the BOV vacuum souce.

 

[-DSM2NR-]

why wouldn't you run the mbc between the bov and the wastegate. I'm doing it this way and don't have any problems with boost spike or anything else..............

 

[MrBoxx]

oldman has already explained, several times and at length, why you should NOT tap the BOV for an MBC pressure source. The long and short of it is that tapping the BOV line creates a boost leak for the BOV, gives a pressure source to the wastegate after the pressure drop from the intercooler which could cause the turbo to be over-spinning, and if there is a boost leak between the turbo and the manifold will also cause the turbo to over-spin. Proponents of tapping the manifold/BOV for the pressure source will say that they want to regulate the boost to what their engine will see. Well, you tapped the manifold for your boost gauge, so the boost you set the MBC for is what your engine is going to see anyway, right? Edit: If you're running an MBC off your BOV line and are happy with it, that's fine. Just be aware that it might not be the best way to do it.

Taken from another of oldman's posts:

Taking the pressure source from the j-pipe fitting has many benefits.

1. The main reason why alot of mbc instructions and some tech articles suggests to tap from the BOV line is because it's connected to the intake manifold, the argument is that this is more accurate because it's the same pressure the engine sees. In reality this is a non issue because the boost gauge is tap to the intake manifold no matter where you tap your mbc so there is no advantage in tapping the bov/manifold pressure as previously thought.

2. The proper functioning (opening and closing) of the bov depends greatly on the accuracy of the pressure in the vacuum hose you're thinking of tapping on or off boost so it's best to leave it connected directly to the manifold without any interference.

3. Tapping off the compressor/j-pipe offers the shortest vacuum hose route which greatly reduces the chance of boost spike.

4. In the case of boost leaks, tapping off the compressor/j-pipe will help prevent over boosting the turbo.

5. Hooking up a bleeder type mbc like the TurboXS standard mbc to the bov line will result in a vacuum leak as well as affect the working of the BOV.

Leave the stock BCS plugged in, but cap off the nipples. The ECU apparently likes to see a signal from it anyway, even if it's not functioning.

 

[daveyfx]

Makes sense I suppose.

Do we have a tech article up about the PROPER way to hook up an MBC then? It would be nice to have a diagram on top of this.

 

[pitbullowner_2]

cool guys thanx i'm going to change it then because it sounds to me if i tap into my bov line then it will eventually tear up my turbo by over spinning

 

[3134]

i am not sure what type of mbc you have, but if you have a turbo xs i would give them a quick call before you hook it up. I kno with mine the process of where to connect each side was reversed from other mbc's. I connected the side of my mbc to the wastegate and the other side to my other source depending on where you want to connect it and i had serious boost spikes. i had to switch them around to get it working right.

 

[GSXerr]

Ive been reading all through the forums and keep seeing mixed feelings on how to mount manual boost controllers. Which way is best? This way

or this way?

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[turbo2g111]

I did mine similar to the first, but I looped it around the intake pipe. Don't put it near the turbo/manifold, or it will not be fun to adjust while hot.

 

[oldman]

The BOV line was the old way of doing things, it has been known for a while now that it's actually the worst place to tap for your mbc, the compressor housing/licp would be the best source.

 

[GSXerr]

The BOV line was the old way of doing things, it has been known for a while now that it's actually the worst place to tap for your mbc, the compressor housing/licp would be the best source.

compressor housing, like in the 2nd & 3rd picture shown? licp as in the lower intercooler pipe? how do you get a vacuum line into the lower intercooler pipe?

 

[oldman]

compressor housing, like in the 2nd method? licp as in the lower intercooler pipe? how do you get a vacuum line into the lower intercooler pipe?

I can't really see where the pressure source is coming from on the 2nd picture but the basic idea is, the closer to the turbo the better. Some J-pipe or turbo outlet pipe comes with a fitting but in your case it's best to drill and tap the compressor with a 1/8npt to 1/8" fitting unless the line in picture #2 leads to the compressor housing which I can't tell.

More importantly, if the mbc in picture 2 & 3 is a ball and spring type mbc, you have the inlet and outlet reversed.

 

[Jeremy8302]

My MBC is tapped from the J-pipe from my 14b to the wastegate.

 

[GSXerr]

I can't really see where the pressure source is coming from on the 2nd picture but the basic idea is, the closer to the turbo the better. Some J-pipe or turbo outlet pipe comes with a fitting but in your case it's best to drill and tap the compressor with a 1/8npt to 1/8" fitting unless the line in picture #2 leads to the compressor housing which I can't tell.

More importantly, if the mbc in picture 2 & 3 is a ball and spring type mbc, you have the inlet and outlet reversed.

its blcknspooln's car ( http://dsmtuners.net/forums/showthread.php?t=218036 )

he cut the wastegate vacuum line & just put it between it for his internal wg. so he has the inlet and outlet reversed?

 

[oldman]

he cut the wastegate vacuum line & just put it between it for his internal wg. so he has the inlet and outlet reversed?

With a ball and spring type mbc, the pressure source/inlet is the fitting opposite but inline with the adjustment knob, I can't comment on Tom's car because I don't know if it's a ball and spring type mbc.

Here is a good read on the subject, http://www.dsmtuners.com/forums/showthread.php?t=222766, last post is a picture of how it should be setup.

 

[blcknspo0ln]

Hi,
As Bruce suspected, it is a ball and spring MBC. I had the MBC hooked up backwards in that picture along with it being severely kinked, as you can see. In essence, the ball part of the MBC should be pushed against with the pressure source and the other side is the pressure release (if you will) into the wastegate.

Hope that clears things up

 

[tyger1]

Allright. I just recently hooked up my Hallman Evo pro rx MBC. and i got a question with the installation and "the source" for the MBC on a 99 GSX. I checked vfaq and the tech articles on this subject but need further verification. Right now i am boosting around 15psi. with the MBC fully backed out (counter clockwise) I checked all the lines for leaks and found none. right now the MBC is teed off the BOV line. Is this correct? I read on other threads that it is not teed off the bov hose but rather connected directly off the compressor housing. which is right? I have a Hahn racecraft super 16g turbo with an adjustable internal wastegate. thanks

 

[skinnykenny84]

http://www.belitski.com/vfaqhallman.html
this is exactly how it should be connected!

 

[tyger1]

yup thats the one i followed, but I was wondering what happen to the other hose that was connected to the bcs? it just said pull it but never mentioned capping the bcs line. I capped it off because i am not too sure. in the other threads it said the vacuum "source" was at the compressor housing and it is better to connect it there rather than tee off the BOV line. I followed the thread above but i cannot turn down the boost. (not that i would want to but just incase i need to).

 

[skinnykenny84]

you need to block off what ever hose you dissconnected from the intake with a screw or something. you should tee one side to the bov line and the other goes to the compressor (or existing tee shown in picture)

 

[tyger1]

you need to block off what ever hose you dissconnected from the intake with a screw or something. you should tee one side to the bov line and the other goes to the compressor (or existing tee shown in picture)

ok my BOV line goes from the top of my intake manifold to the BOV. I teed off that line and it goes to the MBC. as for the compressor housing i just plugged it. this is where i am confused. here is a pic of my engine bay with a simulated photo of how it is hooked up.

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green hose----------------mbc to adjustable wastegate
blue hose------------------mbc to tee fitting off bov line
yellow hose---------------BOV line
black----------------------tee fitting

BCS hoses capped off (both)
intake nipple capped off
compressor outlet nipple capped off

thanks