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 - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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