IIRC the T-5 engine is designated 5234T
5 = 5 cylinders
23 for 2.3 ltrs
4 = 4 valves per cylinder
T for Turbo (as mentioned)
850-T5's were originally 225BHP (later V70 & S70 variants may have a smidge more, not sure).
850T-5R arrived soon after this & came with 250BHP on tap.
PS, yours is a later engine variant & not a T-5, again IIRC. Someone will confirm (or otherwise) my thoughts soon