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Governed/ungoverned engine dyno testing

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Gabriel Guerreiro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gabriel Guerreiro Quote  Post ReplyReply Direct Link To This Post Topic: Governed/ungoverned engine dyno testing
    Posted: Nov/10/2018 at 12:42pm
Hello there, I was reading the 'Engine testing: theory and practice' and it says that when you use a dyno on position and torque mode (throttle opening is fixed and the resistive torque of dyno sets the speed) it's needed to leave the engine ungoverned:

"Position and torque mode (governed engines)  Governed engines have a built-in torque–speed characteristic, usually slightly ‘drooping’ (speed falling as torque increases). They are therefore not suited for coupling to a dynamometer in speed mode." 

Anyone here have any idea if this applies to our engine and why it happens? Confused
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