Problems with boost and mbc

[xcelr8n]

alright guys, this has me and a couple others confused, we have kinda narrowed it down just looking for input here....
i have a 2.5" turboback w/straightpipe... and the rest of stage 1 mods...
ok, when i run from the bcs, ie. stock boost setting i creep to like 12psi...
when i took that off I ran from wga, to the bov line to the manifold, using this method i hit a solid 10psi and never spike past that...
now heres the PROBLEM I installed my mbc, and no matter what I do, I cant keep the boost down... in 2nd gear it hits like 15-16psi, and in 3rd egar it hits like 18psi..
this is with the mbc turned all the way in to its lowest setting?
any ideas? If i was creeping, wouldnt I creep all the time, not just with the mbc installed

 

[Polyol]

I had a similar problem also. The problem is the spring inside the MBC. It is too strong and will not allow the ball to slide which, allows the wastegate to open. I solved it by cutting a 1/4 of a coil off at a time until I got good adjustability. I think I had to take off an entire coil until I got my boost back down to manageable levels. Hope this help. I have had no problems with mine since.

 

[Bjeezy01]

What MBC's are you two running? I just installed a Q-boost, and I am having simular problems, but as soon as I see my boost go past 16psi, I let of the gas, so I am not sure exactly what it's stopping at....Do you think cutting the spring would fix my problem as well? (I am shooting for the 2g stock setting of 15psi)