Haltech E6S - Manual (Page 20)

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1.3.3. Inlet Air Temperature Sensor
The air temperature sensor is used to compensate for changes in air density due to air
temperature. Cold air is denser than warm air and therefore requires a greater volume of fuel
to maintain the same air/fuel ratio. This effect is most noticeable in forced induction engines.
The Haltech E6S will automatically compensate using the signal received from the air
temperature sensor.
The sensor should be mounted to provide the best representation of the actual temperature of
the air entering the combustion chamber, i.e. after any turbo or supercharger, and intercooler,
and as close to the head as possible. The sensor needs to be in the moving air stream to give
fast response times and reduce heat-soak effects.
Note: The Haltech air temperature sensor will read temperatures up to 120° C and
temperatures above this will be interpreted as a fault condition. The air temperature
after some turbos and superchargers can exceed this. If this occurs with your engine you
should consider fitting an intercooler to reduce air temperature and increase charge
density. If this is not possible then the air temperature sensor should be placed upstream
of the turbo or supercharger to monitor ambient air temperature.
Once a suitable position has been located for the air temperature sensor a hole should be
drilled and tapped to accept the sensor. Remove the manifold or inlet tract from the engine
before machining the sensor mount. Do not allow any metal particles to enter the inlet
manifold of the engine as these will be drawn into the engine and damage it. Wash all
components before reassembly.