Torque is not accurately measure unless one stops the engines acceleration. The rate is used to simulate a car accelerating, and the torque is backed out of the force required to hold that rate. But the actual torque spit out and graphed is not what is measured.. It can't be, otherwise the engine wouldn't gain revs. Instead one can use the rate and some constants to figure out what the stopping torque would theoretically be and good software can be close, but I'm sure not all softwares are equal..
