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more torque of course wouldn't help if you can't use all of it.
with my 52hp diesel my foot isn't on the floor all of the time, therefore the engine is too big, that's my take.
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Ding ding ding!!! That's correct.
However, even with a turbo that allows for faster acceleration at the same FC, that value is in Fuel/Power not Fuel/Time, therefore, there is no gain.
In a P&G scenario, with an N/A motor, you might spend 5 seconds pulsing from 55-65mph. In a turbo motor, you might spend 3 seconds doing the same. However, when you reach that 65mph, you will have burned through at least as much (of a more expensive) fuel as the N/A motor. Remember, the map is Fuel/Power, not Fuel/Time! A turbo only makes the sweet spot taller, it doesn't make it sweeter or shorter.
Besides, if you don't know what happens when you suddenly shut off the oil feed to a spooled turbo, let me tell you, it's not pretty or cheap.