overboost /fuel cut.....

[stig this]

i had a problem with overboost a while ago @ 1.5bar so took the car to subaru gatwick they fitted a bit in the boost/sol tube and that sorted it down to 1.2bar. last week i found loose fitted "y" pipe and induction pipe so tightend all pipes and the boost went up to 1.4bar i then fitted a hks bov "sounds sweeeeet" but now when i boot it boost is just over 1.5bar was thinking about getting hks evc 4/5 rather than standard as i wanted to also upgrade to an apexi power fc ecu. any helpfull suggestions would be much appreciated its a sti v3, 6s ecu 311bhp

[Scott.T]

Sounds like you have a leak somewhere or a sticky boost control solenoid.
Gatwick shouldn't of changed the restrictor without investigating as it's likley due to a fault/leak which the change in restrictor has masked.

Are you still running OE boost control ??

The boost control pipes should be plumbed as per my post to CJ which I have copied below :

Standard 2-port plumbing :
turbo to T-piece (restrctor in pipe)
T-piece to Actuator
Bottom branch or T-piece to Boost Control Solenoid
Then Boost conrol solenoid to inlet manifold (the little black elbow just to left of main induction hose).

[stig this]

Originally Posted by SilverSurfer

Are you still running OE boost control ??

The boost control pipes should be plumbed as per my post to CJ which I have copied below :

Standard 2-port plumbing :
turbo to T-piece (restrctor in pipe)
T-piece to Actuator
Bottom branch or T-piece to Boost Control Solenoid
Then Boost conrol solenoid to inlet manifold (the little black elbow just to left of main induction hose).

Yes its a standard boost solenoid. i will check all the boost pipes and spray carb cleaner in boost sol. today cheers what boost level should i be getting as it was working good @ 1.5bar, my defi`s read 1.5bar but surrey rolling road read 1.2bar... thanks again for your help

[Scott.T]

standard boost should be around 1bar.
if it's running 1.5 it will probably be detonating and will defo be runin ff the end of the fuel/ignition map, which is not good.