I don’t understand how there could be a difference in power and torque if you are burning the max amount of fuel possible 100 percent of the time.
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I assume you know the concept of how a combustion engine works. The pistons suck inn an air and fuel mix which it compresses and then ignites it which generates a huge pressure pushing the piston back down. The issue is that the combustion takes place over a certain amount of time. After the combustion is over the gasses cool down and you start loosing pressure. So if the engine rotates slowly then it will only generate high torque while the piston is at the top. But if the engine rotates faster then it will make torque all the time the piston goes down as the gasses still expand. You even get a flame front increasing the pressure at the piston compared to the engine head generating even more force.
However if the engine goes too fast then the combustion is not done when the piston gets all the way down. So you are pushing fuel out the exhaust pipe instead of using it in the engine. Even worse the engine loses energy when it compresses the air and this energy is just pushed out the exhaust and not used. Adding to this all the friction in the bearings, the water pump, the oil pump, etc. and the engine end up using more power then it can generate when going too fast.
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