Coolant Temp Bias

Coolant Temp Bias



The Coolant Temp Bias table generates the Calculated Air Temp value. The Calculated Air Temp should closely approximate the actual air temperature entering the combustion chamber. This value is used as part of the ECUs volumetric efficiency calculations.

0% in this table will cause the Calculated Air Temp value to equal the Intake Air Temp value.
100% in this table will cause the Calculated Air Temp value to equal the Coolant Temp Sensor value.

At lower engine speeds and loads, the Calculated Air Temp is biased towards the Coolant Temperature value. This is due to the slow moving intake charge having more time to absorb heat from the surrounding intake runners and cylinder head.
At higher engine speeds and loads, the Calculated Air Temp is biased towards the Intake Air Temperature value. This is due to the higher air speed reducing heat soak and higher injected fuel volumes removing heat from the intake charge as it passes into the combustion chamber.

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