Originally posted by Big Jim:

You are almost there. If it is producing less power than required to propel the car it is engine braking and that engine braking is assisting in stopping the car.




Okay, that I get. However for maximum braking would the power not be cumulative to the momentum as it is still creating some momentum ... and if you are braking hard, once the velocity drops (if dropping quickly) to match the velocity that the engine is trying to produce, further hard braking is going to be working against the engine too, as the engine is not dropping quick enough to match the drop in velocity, so you're (from that 'sweet spot') braking against both the momentum of the car and the engine's power output (even though it is dropping) ?

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