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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: BOV's & Wastegates
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Tue, 04 June 2002 07:48
 
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MAP senses the "Manifold Absolute Pressure" to work out how much air the motor is getting, the higher the negitive pressure the more air the engine is getting (sucking in), hence the more fuel it should be given to achive the correct mixture.
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Actually they work the other way round, which makes sense when you think about it.
When an engine is idling the engine is sucking & using air, but because the throttle is closed, that's when vacuum is highest. As the throttle opens, the pressure inside the plenum (on the engine side of the throttle) slowly equalises with the outside air pressure (atmosphere) until at wide open throttle the manifolds absolute pressure is zero, zero vacuum and zero boost. Unless you have a turbo engine, where the reading goes from vacuum at idle to pressurised at wide open throttle (WOT).
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