Hi Team,
Boost gauge has recently started reflecting 19-20psi boost spike on initial wide open throttle (WOT) then returns to 15.9psi (1.1bar) after a few seconds. My understand is that 1.1bar is stock internal wastegate (IWG) pressure - could someone please confirm this?
Turbo is VF28 and vehicle is V5 STI.
From the symptoms I believe that my IWG diaphragm has a hole and is leaking boost which is why it's taking 19-20psi to open it - could someone please confirm or deny this? Please provide a fact based response if you choose to do so.
Secondly, for the duration that my wastegate is not efficiently releasing waste, 2-3 seconds, are my injectors pushing the required fuel into the cylinders?
TIA. Brett