I think they have been incredibly conservative with the torque and power figures released. For this capacity i would expect 8-900NM torque, and to be comfortably wellover 700hp.
Regarding revving to 9000rpm.....i think it boils down to how much fuel in the tank there is to burn, versus tank capacity, pit strategy and so on......the engine can be run quite hard, but if you can achieve competitive pace via short shifting and saving fuel, then thats the direction to go.
F1 engines only rev so high as the FIA mandate it to make noise and keep the fans happy, but the F1 engine folks have openly admitted the same track performance can be achieved with drastically less rpm, but the engines will otherwise sound dull as hell.
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