Some of these have a throttle plate for air control, and others just control the boost to maintain air fuel ratio. The turbo's use compressed air to spool them up and provide boost until they are working.
We sometimes retard the timing about 10 degrees to get enough heat in the turbo to provide boost so there is enough air. The engines will detonate under these rich conditions of too little boost. Once the engine is working, there is plenty of energy to spin the turbos. It is a balancing act to get the engine to produce enough torque to load up with the timing that slow so it can produce its own boost, then you can advance the timing.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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