300zx TT won't boost over 7 psi?! Help :(

[Garth1994]

Hi guys, really struggling here
I have a 1990 300zx tt manual, LWBit won't boost over 7 psi :/ showing no fault codes just 55

It has an Greddy profec 2 boost Controller
Standard boost solenoids disconnected
Really strugglING to figure it out :/

[DCaff300ZX]

Such a tough one to figure out, really not much to say other than Sorry for your pain to come, and hopefully you have a boost leak tester to hunt down the vacuum/boost leak. I spent almost three months narrowing down my problem to a seized turbo.
The OSM has some good tests and diagrams and such to help out, as well as TT.net and other sources you can find searching boost leaks and boost leak tests.

[NolimitZ32]

Is it the settings on the profecB maybe? Once you remove the factory boost control system the only two things responsible for boost are the AM system (profecB in your case) and the OEM waste gates which are set to 7psi. So it sounds to me like your profec B is either not set up correctly or the actual solenoid portion of it is toast,