Std is around 0.7/0.8, so I would open the ecu and see if there is a different chip inside, if someone has simply upped the boost by body means it could kill your engine, by not having the fuelling to go with it.
If it's new to you, best thing is a mega service, everything inc new fuel filter, fuel pump rewire, fan rewire, change cts and ats, then get it set up/adjusted on the rollers for a fuelling check.
tabetha