Boost Creep/Spike

[gsx rated98]

ok, so i know this has been tackled before, but little twist here. My car has been creeping up to about 24 psi for a while now. This morning i replaced my BC with a Hallman. Now im not creeping anymore, my boost is spiking up to 28 psi. Has anyone run into this, or have any idea of whats going on, or why switching a MBC will do this.

Thanks
Jerry

 

[oldman]

Double check the mbc install. You are probably still creeping but it's now covered up by your mbc problem. You may have the hose reversed so the actuator get no signal, a leaking hose from mbc to actuator can also do this. Describe which Hallman and how it's hooked up.