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Re: How the turbo works

  Yes, the WG does control the flow of exhaust gas through the turbine side
  of the turbo, but indirectly. The WG allows some of the exhaust gas to
  bypass the turbine to limit the speed of the spinning assembly, thereby
  limiting the boost pressure created by the compressor side of the
  turbine. I guess one could think of the WG as a "turbine bypass valve".
  What is usually referred to as a "turbo bypass valve" is in actuality an
  engine bypass valve, or compressor feedback valve.