The continued expansion of the exhaust gasses is what really creates the energy to spin the turbo, otherwise air in and air out would cancel the energy. You can gain additional boost at the expense of torque by retarding the timing and causing unburned fuel to essentially burn/expand in the turbo. We do this on the big NG engines to get the turbo's hot and spinning on startup. They will not develop any torque to speak of but they will not detonate due to a rich mixture either.
It is easier to create boost with cold air because it is more dense and compresses easier.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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