Have been thinking if there is a norm for measuring the speed of wich an engine with no load can gain revs.
Some times i drive a truck. It used to be a Scania P94 230hp. Really slow with 24 tonnes. But as quick as any truck when empty. Now it´s a Mercedes Antos 2643. It´s a lot faster up the small Danish hills than the Scania, but slower than the Swede to gain speed when empty.