Boost doesn't change using MBC

[TargaMK3Turbo]

Last year my mbc worked fine. I went to mess with it, turned it both ways and there was no change in boost.
...and yes, the mbc is hooked up right lol
Last year after adding intake and exhaust, my boost was at 11psi. I then added a Lex AFM and fuel mods and the mbc still worked fine, I turned it up to 13psi. The car sat all winter, installed a clutch, let it break in on low boost. Then, I went to turn it up a smidge and I got nothing... I turned it both ways and no change in boost. The car runs and drives perfectly though and boost fine. The lines don't have any cuts or cracks, and has been untouched from last year. I bought it from Dr. Jones here on the forum.
Is my mbc dead or is it my wastegate actuator?

Also, while Im at it.. My turbo is fluttering, compressor surge Im told. I have a Blitz BOV, the screw on the top, do I screw in in out out? How do I know when its right?

Thanks!

 

[tlo86]

the mbc's dont just die maybe something is clogged in it? also check the wastegate and see if it is stuck open

 

[IwantMKIII]

you've developed a boost leak elsewhere then. MBC's don't simply stop working.

 

[tlo86]

what are you boosting right now? take off the MBC what are you boosting?

 

[TargaMK3Turbo]

what are you boosting right now? take off the MBC what are you boosting?

I get 11psi with the mbc on and with it off...
I replaced the wastegate assembly last year also...

Ill check all my couplers.

 

[tlo86]

is this a ct26?

 

[jtran8]

Your mbc might be stuck open . Remove it from turbo and use your mouth to blow though it while turn the knob in and out to see if any change , if not then disassembly it clean up internal parts and put them back together .

 

[TargaMK3Turbo]

Yea, its a ct26.

I can't turn the knob and blow through it, doesn't have a knob...

 

[turbojuiced]

What kind of mbc is it? My hallmans spring broke and the little ball inside fell out. So they can definitely break. Usually if the mbc breaks you will boost off of your wastegate. So thats a quick indicator to tell. Usually if you turn the mbc both ways and nothing occurs the MBC is shot. But I am not there to see it and tinker with the car so I really cant say for sure. Just explaining my past experiences I then got a dejontool and it worked perfectly and has yet to fail me.

 

[jtran8]

If it dosen't have knob , it should have a screw that use allen wrench . with out knob or screw , how can you turn up the boost ?

 

[TargaMK3Turbo]

If it dosen't have knob , it should have a screw that use allen wrench . with out knob or screw , how can you turn up the boost ?

Doesn't have those either. Its the ones Dr. Jones sells, half the mbc twists in order to change boost

 

[TargaMK3Turbo]

Also, anyone have any info on that BOV question I had?

 

[Pantaloon007]

Doesn't have those either. Its the ones Dr. Jones sells, half the mbc twists in order to change boost

I can't turn the knob and blow through it, doesn't have a knob...

That half is the knob. If you turn it both ways and nothing happens, its clogged or broken. Just take it out and either fix or replace.

 

[turbojuiced]

Im not too exactly sure whatyour asking in regards to the bov question?

 

[TargaMK3Turbo]

Im not too exactly sure whatyour asking in regards to the bov question?

I have compressor surge, I was told by adjusting the BOV, I can get rid of the sorge. Theres a bolt on the top of the BOV that compresses or contracts the spring. Do I turn it in or out?

Also, my friends said the when we went cruising yesterday that my car was puffing out black smoke when I let off the gas. The car also stalls a lot when coming back to idle... Aren't these signs of a boost leak? I need to get better claps, I have hardpipes and the couplers aren't too bad but the clamps pinch the couplers. Who sells good clamps that won't pinch the couplers?

Thanks for all the help so far. Oh, and I took apart the mbc, everything looks fine.

 

[JustinGotA1j]

If it turns out you need to replace the MBC and you want to stay with DrJones' then I have a brand new one that has never been installed since I ended up buying an EBC and you can have it for next to nothing.

 

[TargaMK3Turbo]

If it turns out you need to replace the MBC and you want to stay with DrJones' then I have a brand new one that has never been installed since I ended up buying an EBC and you can have it for next to nothing.

Im glad you brought that up bc I somehow lost the spring in the boost controller. PM me with a price...

Tightened most of my clamps.. Jus need to either get a new spring or new mbc...

 

[1992supraman]

I have compressor surge, I was told by adjusting the BOV, I can get rid of the sorge. Theres a bolt on the top of the BOV that compresses or contracts the spring. Do I turn it in or out?

Also, my friends said the when we went cruising yesterday that my car was puffing out black smoke when I let off the gas. The car also stalls a lot when coming back to idle... Aren't these signs of a boost leak? I need to get better claps, I have hardpipes and the couplers aren't too bad but the clamps pinch the couplers. Who sells good clamps that won't pinch the couplers?

Thanks for all the help so far. Oh, and I took apart the mbc, everything looks fine.

the black smoke out the back and then stalling is because your BOV isnt recirculated. When you let off the throttle all that metered air leaves the system and causes it to run really rich until you start accelerating again.

 

[TargaMK3Turbo]

the black smoke out the back and then stalling is because your BOV isnt recirculated. When you let off the throttle all that metered air leaves the system and causes it to run really rich until you start accelerating again.

Ohh, ok. I was told to turn the screw in and compress my BOV spring, so hopefully that does it..

Dang, now I'm not sure what the deal is. It just came from the shop and I don't wanna take it back... Boost controller is fine, so are the lines. It holds boost, doesn't drop at all, but can't be changed...

 

[turbojuiced]

well supraman answered it for me so there ya go. we have the same problem in the evo community.