I've got a boost problem and I'm a bit stumped by it. I replaced the turbo about 1200 miles ago and it was fine. Spooling up like normal at about 1700RPM. It seemed to get a little worse but I thought nothing of it until a couple of days ago when I went to accelerate like I normally would on the motorway in 6th gear. Nothing. Tiiiiiiny increase in speed but that was it. After a bit more driving around some A roads the turbo isn't really spooling up until 2400 or so RPM, then it goes like a rocket like normal. There's hardly any pull at all before that.
I've replaced the vac pipes from the vac pump to the boost solenoid, and the one from the solenoid to the turbo. The boost sensor was cleaned about 3000 miles ago, and the EGR has been blanked off for about 10,000 miles.
Run out of ideas now!