I told him it felt like a electrical fault, it was like putting the brakes on when it boosted i know a bit about them thats why i took it to specialist as i couldnt diagnose it myself, had vagcom on it etc, no fault codes.. so it probably was the ECU at fault, but it didnt need a turbo that worked fine before yes the sump bung was broke but most garages now use the vaccuum to suck the oil out on a service (even VW do this)
the only thing i said go ahead and do was the turbo as he assured me it would run fine and that was at fault.
so hes fitted all them bits and now it turns out it was the ECU, still hasnt rang up with a bill after he said its running fine