hello emanuele....
as well, you know, a turbo, plus it brings more air into the combustion chamber is also equal to the operating pressure, therefore, there is substantially more air your afr will go up and you will be probably a more skinny...then the first thing to do is to carefully monitor via a log or a wideband for your afr and, consequently, to adapt it to the new engine requirements...
another key aspect to monitor when you mount a turbo bigger is the ignition advance...
also here you have to monitor via the log signals from the temperature sensor the intake air in the manifold and those of the knock sensor to see if your engine is a bang or not....and in the case reduce to some degree the advance...even if some of the ecu they are already, if it can be that your knock is a little high and the ecu is not able to return within the limits of safety...
this, fundamentally, so then you have to see case by case... that the car/ecu is it??