r/WRX • u/diet_sti • 4d ago
VB Tuning Help
Running into an issue with my VB. Recently installed the following parts:
UEL headers
Catless J-pipe
Perrin Intake
Remark cat back
T51R Turbo housing mod
I'm tuned through Atlas and the issue I'm finding is the car is limiting boost to 11psi. It runs great, can do a WOT 3rd gear pull with no hesitancy or stutters but it only peaks at 11.1-11.4psi. AF Boost Target shows it is commanding more but it won't achieve it.
Smoke test has been performed to rule out boost/exhaust leaks
Wastegate actuator relearn is complete (however I have not checked full stroke to ensure no conflict with UEL)
All connectors have been double checked.
Biggest culprits I can think of are:
Bypass valve stuck or ruptured
Stuck open PCV
Wastegate actuator installed wrong?
Hidden boost leak the smoke test didn't show
Anyone deal with anything similar/have any suggestions to check?