Hallman MBC issues

[kittay]

Has anyone else had any problems concerning their hallman mbc?
I've been running into symptoms of boost leaks, so when I went to check, the only thing that was indicating a leak was the MBC itself from the bleeder. At the track the other weekend, no matter how high I cranked the boost up, it would only go to 14-15psi.

 

[SonySlave]

You know what's odd? My Hallman ES MBC was having the same issues for a while. I would use some threadtape and it would be ok, then it would just do it all over again. I then took the spring out and stretched it out just a hair and now I don't have any issues, though I'm still considering a new MBC for reliability reasons. We'll see...

 

[kittay]

Yuh.. It was holding boost. Before the track it was around 18psi. I made my pass and realized it was at 14??? Cranked it all the way, same.. So of course figuring a big boost leak, but that's all that there was, other then of course slight amount from the TB.
Idk??

 

[ILLiCliPSE]

is the mbc possibly hooked up backwards? hey its not impossible...


i just got my hallman pro mbc and im loving it

 

[kittay]

No it is not hooked up backwards, it is the bleeder I am having issues with.

 

[turboglenn]

It sounds like you're not able to bleed off enough air to open the wastegate later. Have you tried a simple hardware store bleeder vlave to see if you can make more boost?

Also you can use a smaller vacume line to the MBC and a smaller one from there to the wastegate to help change teh relation of airflow so that you can bleed off more of the total volume when using smaller lines

 

[kittay]

I'm also thinking it may be the spring in it. I noticed that new, they come with 2 springs. One rated for 4-5 psi, the other for 5+. If I have the lightweight spring, that would explain why it's only going to 14-15psi, and when it was going to 17 most likely a boost spike from internally gated.

But I will give that a try and see if it helps, but for now I just threw on my Dejon one

 

[silver bullit]

I'm also thinking it may be the spring in it. I noticed that new, they come with 2 springs. One rated for 4-5 psi, the other for 5+. If I have the lightweight spring, that would explain why it's only going to 14-15psi, and when it was going to 17 most likely a boost spike from internally gated.

But I will give that a try and see if it helps, but for now I just threw on my Dejon one

Light spring will only do +4-5psi you need to switch out to the heavy spring.

 

[kittay]

Yuh.. that's what I'm thinking. Know of where to pick up the spring?

 

[silver bullit]

I have one that came with mine but ill need it later when i go holset.

Call them up or go to there web site and see if you can get one. Or look around the house for things that have springs... clicky pens etc...