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Load is a function of measured manifold vacuum. When there is no restriction meaning 0 manifold vacuum then you have 100% load without enrichment. As you increase the throttle position to 100% you reach a point where the ECU will provide enrichment for additional power.
If you do not consider full load enrichment, then load is directly proportional to manifold vacuum. MAP (manifold absolute pressure) is the measurement of pressure actually delivered to the combustion chamber. Manifold vacuum is the remaining atmospheric pressure not allowed in to the combustion chamber.
Atmospheric pressure varies with climate, altitude, and density. MAP readings cover this, while manifold vacuum does not tell you what the atmospheric pressure reading is, just the difference between atmospheric pressure and the remaining atmospheric pressure delivered to the cylinders for compression.
Make any sense?
regards
Mech
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