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Vacuum/boost gauge on diesel, theory?
I have had vacuum/boost gauges before on N/A gas engines and turbo engines. Have always felt that keeping the vacuum high was a key to economy.
I have a turbo VW diesel now and wonder about the usefulness of a boost gauge. I can hear the the turbo whine even with very light throttle. The diesel engine is basically at full throttle all the time and the injectors are controlled by the foot feed. Does the turbo help to push more air into the engine to keep it lean yet powerful.
If I had a boost gauge would economy be adversely affected by keeping the engine out of the boost?
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