Boost problems

[JET-R31]

I was wondering if anyone could help me figure out the problem with my skyline. I recently just swapped a RB20DET NICS version into my R31 skyline, and when i did the conversion i also added a FMIC. The engine used to run fine before the conversion and the FMIC but now it has problems with the boost fluctuating all over the place. In 1st its fine cause the boost only goes to about 4 psi but in 2nd and above the boost can jump all the way to 10 psi and then immediately drop to 0 straight after while im still accelerating. Im 99% sure that all the sensors are wired in correctly and i have no bleed valve so the boost should be standard ( 7psi i think). I cant figure out whats wrong, so hopefully someone can shine some light on the situation.

[RBVS]

if it dropes to zero could be boost cut from the stock ecu. I dont see why it would only make 4psi in first gear then 10psi in another. If you floor it to red line in first does it still only make 4psi.

[RBVS]

boost will be standard 7psi if you have the factory boost soliond as that is what it will work to do. if you just have a pipe from manifold to actulator you will get minimum mechanical boost. bleed valves and solinoids increase boost from that value.

[JET-R31]

I haven't taken it all the way to redline in 1st yet but it feels as if it would make it all the way to the maximum standard boost, but the gearing is different so the load is not as high. The boost solenoid is connected so i should have standard boost. The only other thing i can think of is the boost sensor which operates the standard boost guage in the dash, which i removed to fit an aftermarket guage, but due to the wiring i assume this has no input to the ecu