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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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