© 2005-2016 Nira Control AB 30
3.7 Manifold Air Temperature Sensor (MAT)
The MAT sensor is used for air density compensation at different intake air
temperatures. Its function is very important on a
turbo charged engine where the intake air temp
can rise 100 degrees Celsius in mere seconds.
The MAT sensor needs to react quickly and must
be properly calibrated. Your NIRA i7x dealer can
recommend several combined MAP/MAT sensors
that meet these requirements and have been pre-
calibrated in the NIRA rk software.
If you prefer to use the original MAT sensor on your engine you need to
know or establish its transfer function. (The transfer function describes the
resistance of the sensor as a function of the temperature.)
Sometimes the existing MAT sensor is mounted before the throttle butterfly.
In such situations it is recommended to move it after the butterfly, or better
yet, use a combined MAP/MAT sensor mounted after the throttle plate, see
section 3.4
For fast MAT response, use a sensor with a small sensor tip. This is very
important on turbocharged engines where manifold temperature can rapidly
increase. Even more important if you prefer to use MAT compensated
ignition angle.
3.8 Lambda Sensor
It’s very important to have an accurate lambda reading
when calibrating your engine. NIRA i7x controls a Bosch LSU
4.9 oxygen sensor. The sensor is of pump current type and
NIRA i7x will not need any external amplifiers or electronics to control it.
3.8.1 Lambda Sensor Mounting
To avoid that condensed liquids are collected in the sensor, a horizontal
inclination of 10 degrees is needed. Due to the temperature limits, mount
the sensor after the turbine with at least 10 degrees vertical inclination.
Maximum exhaust gas temperature for the LSU 4.9 is 930 ºC.
Maximum temperature for the hexagon of the LSU 4.9 is 600 ºC
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