It would help if you could get a learning view shot of the
ECU. You don't need to have the engine running to do this; it just takes a snap shot of a few learned parameters in the
ECU. Will need a laptop, tactrix cable and learning view software from the romraider forums.
Or if you can't do that you can try to log the following parameters:
Engine Load
Engine Speed
A/F Learning #3
Knock Sum
Manifold Relative Pressure or Boost
Primary Wastegate Duty Cycle
Throttle Opening Angle
Just a note though, if you have crap fuel it will use the failsafe fuel map which is super rich and force the car to run wastegate boost, which might explain it feeling slow.