It helps not to work in ridiculous units. Power = torque x angular velocity So in this case let's take the position of the bend, where power goes flat (4000rpm

It helps not to work in ridiculous units. Power = torque x angular velocity So in this case let's take the position of the bend, where power goes flat (4000rpm, 250kW, 600Nm): P=4000 x 2x pi/60 1/s x 600 Nm = 251kW Seems to be correct.