I have a My02 Aus Spec WRX wagon and recently installed a MBC before i researched furthur and found out they are S$#T!! lol. After the car going in to limp mode i have returned to the stock solenoid but boost doesnt seem to be going over 9psi... I then flash tuned a stage 2 xpt map to my car but still the same 9psi, any ideas?
9 psi is the magic number for wastegate turbo pressure. Did you reset the computer's learning after you flashed it? I know that sounds redundant, but my car retained memory on one of my reflashes. . . Or at least it didn't boost again until I reset the ECU learning.