Speaking of a PT6 TP, youŽd be limited by torque in the beginning, way below whatever limit the ITT gives you. In the B200 the red line is 800° - the outfit I fly with limits the ITT to 740°, others I know fly up to 760 and even 780°. So during climb we use max torque UNTIL the ITT gets to the limit (in our case 740°)
DonŽt know about other PWs and Garretts.
What Citation are you talking about ? Most Non Fadec Citations I have flown are more limited by fanspeed than ITT. Essentially the difference to the TP is, that you pull back during climbout to prevent an over the limit N1 in the jet and you push forward in the TP until you reach the templimit.