Where to wire in your mbc

[Talon-96]

Ok I know everyone has an opinion on this and everyone thinks one way is better, I searched through everything about it thats how I know but I want to hear something from someone who has had problems one way or has had it work better the other way. I just want some har facts with someone with alot of experience becsaue I did search and everyone is deiference, maybe a moderator can help me or oldman seems to be the god around here what did you do?

 

[Jeff822]

Ummmm, what exactly are you talking about? >> << this?

 

[brute]

I don't get it.

 

[Jeff822]

I don't get it.

Haha, me either. It wouldve been easier if he actually posted his problem.

 

[Talon-96]

ya thats exactly what I was talking about,actually that lookslike a donkey to me. no but seriously everyone sais ones bad or the others bad I couldnt find a straigt answer on this site so i thought id ask.

 

[kenamond]

Did you forget to post the question?

 

[chuckg]

I'm so confused WTF

 

[Talon-96]

Wow im an idiot I wrote all that and forgot to say what I was talking about, Where to wire in your mbc.

 

[Jeff822]

I have mine tapped into the bov and WGA.

 

[kenamond]

Wow im an idiot I wrote all that and forgot to say what I was talking about, Where to wire in your mbc.

Ahh, that's better.

Some go from the IM to the MBC to the WGA. I have concerns about this, but folks seem to have success with it.

Most go from the compressor or j-pipe to the MBC to the WGA. This seems to work well.

Just DON'T go from the BOV line to the MBC to the WGA.

 

[Talon-96]

I know but I want facts like serious hardcore facts and experiences whether the bov line or the compressor housing is better.

 

[MrBoxx]

Most MBC don't have wires. Just a point to consider.

The old method was to tap the BOV line. This has been proven to cause a few unwanted issues in BOV and MBC function that are solved by leaving the BOV line alone and using a direct boost source, preferably as close to the turbo as possible, for the boost signal to the MBC.

So in short, Compressor nipple/J-pipe nipple -> MBC -> Wastegate actuator

And Intake Manifold -> BOV.

In this case "->" = a vacuum line.

 

[Jeff822]

Ahh, that's better.

Some go from the IM to the MBC to the WGA. I have concerns about this, but folks seem to have success with it.

Most go from the compressor or j-pipe to the MBC to the WGA. This seems to work well.

Just DON'T go from the BOV line to the MBC to the WGA.

Whats wrong with the bov line to the mbc to the WGA??

EDIT...Never mind i just saw MrBoxx's post, i'll have to change mine. Mine ran fine like that for a couple months but it seems now some boost control problems are popping up, thanks for the info MrBoxx.

 

[Talon-96]

See what I mean no one has a factual answer on what is better.

 

[MrBoxx]

I know but I want facts like serious hardcore facts and experiences whether the bov line or the compressor housing is better.

Oldman put it best a long time ago, and now I just refer back to what he said:

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.

-as originally posted by oldman

And I sometimes like to add this, as his name reminds me of Gary...

You must be logged in to view this image or video.

 

[Talon-96]

Hmm I never found that Mr boxx that makes alot of sense

 

[MrBoxx]

It's really one of those things that some people do and may not realize that anything is wrong with it because they show no symptoms. Sort of like people who vent their BOV's improperly and say "It doesn't seem to hurt my car, so why shouldn't I?" Some people run the MBC off the BOV line and feel no ill effects, even though they have no way of knowing whether everything is working correctly or not. However, the majority of what I've seen is that people who do complain of irregular boost control, BOV fluttering/sealing/operation issues, etc. Switching their boost source to the J-pipe or compressor outlet and leaving the BOV line alone usually solves the problem.

 

[Jeff822]

It's really one of those things that some people do and may not realize that anything is wrong with it because they show no symptoms. Sort of like people who vent their BOV's improperly and say "It doesn't seem to hurt my car, so why shouldn't I?" Some people run the MBC off the BOV line and feel no ill effects, even though they have no way of knowing whether everything is working correctly or not. However, the majority of what I've seen is that people who do complain of irregular boost control, BOV fluttering/sealing/operation issues, etc. Switching their boost source to the J-pipe or compressor outlet and leaving the BOV line alone usually solves the problem.

Thanks a lot for the info man, ive had problems with my bov blowing off by itself and never knew why but didnt think it had anything to do with tapping the bov line. Thanks again for the info. Jeff

 

[Defiant]

A: Descriptive Thread Titles
B: Use the damned search. Just once. See what it's like.
C: Closed.