Thanks in advance for your time reading this.
I recently got a QP S MY 2012. (been loving it so far) - I didn't realize however that there was a MY 2013 QP 5. When doing research, I used Wikipedia which stopped at MY 2012 (so I assumed errenously, that was the 'last' year) I've since actually corrected the entry.
The question is this. For MY 2013 - there was a 10hp and 20lbs increase in torque for both the S and GTS.
Reading through the service bulletin https://academy.maserati.com/wbt/upl..._Course_EN.pdf
, I see there was changes in 2011 to the F 136 engine
1) hydraulic tappets
2) DLC finish/reed valves
this supposedly only improved fuel economy and not performance for the QPs. However the tappets/DLC did yield the 10hp/+20lbs in the case of the Grant Turismos.
Fast forward to 2013 and all the whole range seem to get the HP/Torque boost - it is explained for the Gran Turismos got some better pistons, updated remapping, but the service bulletin above says nothing about why the QPs got the improvement. I did notice they have different engine codes between the 2012 and 2013 F136s
Hoping you Maserati experts can chime in and give your $0.02.
Thanks again in advance for the education I hope to get.