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.

 

Not throwing stones, but is it hooked up correctly as per the instructions? Or tell us how you have it hooked up...

 

explain how exactly you have it hooked up or take some pics and post them up.

 

I have my vacum line from my wastegate running to the bottom of the boost controller and a vacume line from my vacume manifold running to the side.
http://www.turboxs.com/SBCinstallation.htm

 

I have checked the vacum lines over and over and they look ok to me.

 

Nobody??

 

Problem fixed. I put a differnt wastegate on and everything is working fine.