overboost

[r4lly]

hi i have a sti3 ra and recently have been having overboost problems! normally the car seems to be mapped at from japan at the car pekaing at about 1.3 bar the dropping down to 1.1 bar and holding, but after a long period of driving the car boosts all the way to 1.5 bar and then the ecu cuts it! (btw the mods on the car are only a full de-cat). does anyone know what kind of problem this could be? any help will be greatly appreciated! cheers

[Twistee]

Reset the ecu , check the restrictor in the vacuum line on the pressure side of the turbo - the line that runs from the wastegate actuator to the turbo oulet with a T piece in the centre - the restrictors can block causing boost spiking , check the wastegate actuator - if this is sticking then try some brakeclean and spray into the diaphram vacuum line.