Right I currently have no back box on car.
Car is standard apart from,
Pre-cat, 2.2 Airbox, and recent VXR Turbo.
The problem i have is the car does no way pull like it used to with this new turbo.
My boost gauge shows that it keeps boosting to 2.0bar which is 29psi (does not feel like more of a pull than my old turbo which was knacered and overboosted to 1.0 bar), and stays there for a very long time before it starts stuttering and missfire. If i want the normal 1bar i can only give the car half throttle.
I have changed the actuator back to my old actuator and ensured that it was set to the very end- it does no difference.
I have a dumpvalve fitted but no spacer on the OE valve on the turbo unit itself? should i try a spacer? or block it off?
Could the No-Back box be a factor?
lack of back pressure?
could it be boost solenoid?
any other ideas? it is seriously getting me down;