MBC not controlling any boost?

[805LegendDSM]

What am I doing wrong?

What I did ...so far..

Had a Type S Bov...single spring mod...turbos housing boost source connected straight to the wastegate acuator(because my BCS wasn't holding any boost).

The car held boost...fine...everything seemed good.

Bought a boost gauge, and Manual bleeder style NxS boost controller(finally!)

Installed boost gauge (teed off the FPR line that's also bypassed not connected to the FPS)....only to find out that my car spikes psi at 10, then goes down to 8psi.

So...I thought maybe the boost controller will help...installed it correctly, have the lines hooked up right. Took it for a test drive car went crazy with boost up to 15psi and hits fuel cut...couldn't figure out why...thought the boost controller wasn't lose enough.

Adjust it and it still hits 15+ psi fuel cut, so I immediately stopped driving...

The Dumb piece of Garbage Bov type S purple top wannabe...leaks...a lot, at first a thought the single spring mod and the second port being vented wasn't doing the whole pull/push job especially since I'm running stock psi. Maybe installing the second small spring back and connecting the second port will fix my overboosting problem. Wrong, the BOV is leaking bad from the top where a screw is. If I placed my finger the hissing stops or changes. Seems like a big leak.

Could that leak^^^^ cause the turbo to boost like this? Since under boost the air is escaping thus the valve opening under pressure?

Well....still, I took off the Type S BOv and tossed in the trash, re-installed my stock 2g bov.

Also slapped on my intake cone filter+adapter and took the honey comb off the MAF ...my car is loud under boost and the bov sound sweet. I feel like a semi truck passing by cars ...

Anyways back to the 2g bov, guess what?...it changed everything now may holds at exactly 10 psi....spike to 11-12 then holds at 10.

Finally fixed it...but now...here's why I'm posting the thread.

My boost controller won't control boost!!! It's lose ...the chrome ball and spring are inside, and the bleeder hole is not blocked.

I followed the instructions on here just like the instructions that it came with. One end to the wastegate, another to the turbos boost source.(believe me I got it on right)

No matter what settings the car holds pressure at 10psi, I'm thinking with the MBC on there it's no different than having it how I had it set up before the boost source bypassed to the wastegate.

Another option the instructions it came was having it connected to the intake manifold instead of a boost source?...will this work?

 

[Dxc545]

what kind of boost controller and how exactly is it hooked up?

 

[805LegendDSM]

what kind of boost controller and how exactly is it hooked up?

Bleeder style boost controller, has one spring and ball inside.
Has two nipples on it top one goes directly to the wastegate and the bottom nipple goes to a boost source, on the opposite side of the wastegate nipple these a small needle size hole.

 

[Tyeler18]

Have a pic of it?

 

[Dxc545]

Sounds like you have it hooked up right. Were's the boost source coming from?

 

[805LegendDSM]

Has a hole too

 

[Dxc545]

So the boost source goes to the nipple at the bottom from the adjustment knob and the top goes to the wastegate. Were's the boost source from?

 

[805LegendDSM]

So the boost source goes to the nipple at the bottom from the adjustment knob and the top goes to the wastegate. Were's the boost source from?

The boost source is from the turbo housing.

 

[93RS]

Make sure that the spring is actually making contact inside of the MBC. If you loosen them too much they won't control boost. Blow through the bottom and tighten it until you cant blow through it anymore, then loosen it until it takes almost no pressure to blow through it. Start low work your way up.

 

[1990TSIAWDTALON]

I have had a bleeder style mbc "stick" closed with that ball and spring. To verify it I removed the ball and spring and it worked again, so put it back together and its still working. It just got closed to tight and made it stick closed I guess but it happened to me. You could just put a tee in and see if you have any control then put the real tee back in as a test. Wouldn't take long.

 

[gofer]

You can pull it and test it yourself...

Blow in the end that connects to the boost source, if you can blow through it then tighten down until you can't. If you tighten it down all the way and you can still blow through it then the MBC is trash.

 

[805LegendDSM]

It functions propertly ...tested

Now what? Lol sorry guys if I sound newbish

 

[ryztriumph]

What I would recommend is doing what gofer suggested. Take the thing off and blow through the bottom and tighten the top bolt down until you cannot blow through it anymore. Then put it on your car and take it for a run. Tighten down 1/2 turns untill you start seeing some results. That is pretty much how I got mine going when I first got it, and I also have the NXS ebay one you have. Mine works great. Also, make sure the hoses that go on it are nice and snug.

 

[gofer]

...and if that doesn't work it isn't the MBC. You either have it plumbed wrong (take or draw a picture of how the hoses are setup), your wastegate flapper is blowing open, or the BOV is controlling boost.

 

[ryztriumph]

Also, this thread has everything you'll ever need on hooking up a MBC.

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html


Here is how I used to have mine with my t25.

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