Hi everyone. So I am trying to write a very simple engine simulator for a game, and I have a question about how diesel engines accelerate and decelerate when a machine is in neutral. I have found some videos of a machine at full throttle and then the throttle released, and the engines acceleration pretty much matches the deceleration. I have been using known torque values for the engine, and simply adjust inertia of the engine until the acceleration matches what I have seen in the videos. Then when the throttle is let up, I am using engine brake torques to slow the engine down. Unfortunately, something is wrong with this as I require very high brake torques to decelerate all of that inertia at the same rate it is accelerated. Furthermore, Wikipedia and many other resources indicate that diesel engines have practically no engine braking (unless a compression brake or an exhaust brake is in use) because the compressed air acts like a spring. Does anyone have any experience with large diesel engines in heavy equipment/large trucks? Maybe these engines don't typically output full torque when revving in neutral? Maybe a compression brake is enabled in neutral? Maybe my physics calculations are missing a lot of variables? :) Any help is appreciated! Thanks!