boost controller not changing boost

[Jiggalude]

Alright so I have my TurboXS MBC hooked up. The nipple coming out the side is going to the wastegate, the one on the bottom going to my nipple on my J pipe. The boost controller is fully closed and I'm still only getting 9psi of boost. Could my stock WGA be stuck closed? Or what else would cause this?

 

[Mizzat508]

Make sure the nipples arent loose, if the lines are leaking it wont work correctly. You could try tapping off a different source for the boost pressure. I had NO control with my MBC off the nipple on the compressor housing, but when i moved it to my BOV line it holds boost rock solid. I'm running an NXS MBC.

 

[Redwidow]

Make sure the nipples arent loose, if the lines are leaking it wont work correctly. You could try tapping off a different source for the boost pressure. I had NO control with my MBC off the nipple on the compressor housing, but when i moved it to my BOV line it holds boost rock solid. I'm running an NXS MBC.

Getting your vacuum source of the BOV line is not the correct way to do it. The BOV line should be ran strait from the intake with no interruptions, and the Wastegate/MBC source should be from the j-pipe also with no interruptions.

OP, have you tried switching the lines on the MBC and see if that helps? It should be from the j-pipe to the nipple on the side of the MBC, and then from the bottom of the MBC to the wastegate actuator. Did it work fine before you installed the MBC? Possibly use a vacuum tester to make sure the waste gate is opening correctly also.

 

[_1466_]

Getting your vacuum source of the BOV line is not the correct way to do it...

Agreed.

 

[9!'clipseDOHC]

Have you done a boost leak test to ensure that your system will hold over 9 psi?

 

[Jiggalude]

Yea, it's my BOV, it's leaking as soon as I open the throttle even slightly.

 

[97-gst]

alright now i have a question, i recently installed a frontmount intercooler and at around 5500 rpms my boost drops from 10 pounds to 6 or 7. whats causing this?

 

[Jiggalude]

That sounds like a boost leak to me. Mine is consistent, it will go right to 9 psi and stay there it won't drop off.

 

[9!'clipseDOHC]

Definitely sounds like a boost leak. Also are you still running the t-25? With you other mods looks like its time to upgrade. Boost leak test first though.

 

[97-gst]

yeah, im still on the stock turbo. I heard that it could be my aftermarket ignition. I can see an electric current shooting from coil pack to coil pack, so maybe if they are failing could that be a possibility?

 

[BLINKY619]

like a spark? if yes then you gotta replace it

 

[97-gst]

yeah like the spark is arching from coil to coil

 

[BLINKY619]

yea you gotta replace it....!

 

[_1466_]

yeah like the spark is arching from coil to coil

WTF Oh no! Definitely replace ASAP.