Manual boost controller???

[boosted-delslow]

I searched all around and I cant find anything on the exact problem that I am having. I put a turbo xs standard boost controller on my car the other day and I cant get any less than 12 psi. I thought that maybe it was my wastegate because the diaphram had a small hole in it so I got a new diaphram. Last night I installed the new diaphram, put the boost controller back on and I am still having the same problem. I have checked to make sure that the boost controller is not hooked up backwards.
I cant understand why it will hold 7 psi all day long, but as soon as I put the boost controller on it wont do any less than 12-13 psi.

[Schister66]

What is the lowest setting on the boost controller? Is it designed for a higher boost level than what you're trying to do? I really don't know much about it but that would be my guess.

[97CivicX]

mbc only let you boost more. if you open it up all the way it will be as close to what your wastegate is set at as possible.