Thanks for your answers guys!!!
Solution was that I forgot to put the fiddly electrical connector back on the governor/VNT-regulator/PWM controlled vacuum relay. (It's behind the common-rail-rail iirc).
I think it is wise never to let me near the engine-bay of a car ever again...
Then again, Volvo techs are hardly any smarter than me, replacing junk that isn't broken and similar actions...
Here's me testing the governor secondary pressure. (Gratuitous vid
)
[YOUTUBE]
http://www.youtube.com/watch?v=UX7hg...ature=youtu.be[/YOUTUBE]