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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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