Air Temperature Compensation
As the temperature of air changes, so does its density. This in turn can cause changes in the air/fuel ratio. As the air temperature decreases, its density increases for any given altitude and therefore more fuel is needed to retain the desired air/fuel ratio. The same can apply to ignition timing. An increase in air temperature will increase the chance of pre-mature detonation. You can compensate for these effects by using the air temperature compensation tables for fuel and ignition.
By installing a calibrated air temperature sensor to the manifold or air filter box you can measure the incoming air temperature and use the air temperature compensation tables to adjust the fuel delivery and ignition timing.
NOTE: You must ensure to minimize the effect of heat soak on the sensor by placing the sensor in a location where the airflow is maximum and it is not heavily effected by engine temperature and thermo fan blow off.