© 2005-2016 Nira Control AB 7
stable MAP reading and throttle mapping is the
only workable approach.
Anti Lag System. Sometimes called “response
system.” Often used in racing and rally cars with
turbo engines. ALS maintains the boost pressure
even though the throttle is closed. With ALS
engaged, combustion in the exhaust manifold is
common.
The pressure around us; approx 90 – 110 kPa
absolute pressure depending on the weather (low
or high pressure.) The pressure decreases with
altitude.
Crankshaft degrees. A four-stroke engine turns
720 crankshaft degrees during one complete
combustion cycle. (The camshaft turns half as fast
as the crankshaft and thus completes 360 degrees
during the four strokes.)
These are base values or recommended values.
Exhaust Gas Temperature Control. Nira-developed
exhaust gas temperature measurement unit. Can
be connected to NIRA i7x.
Grounding can be done to the body, engine block
or directly to the battery. Ground is sometimes
referred to as minus or 0 Volt. Poor ground
connections can cause problems that are hard to
find. Make sure the ground connections are
proper.
Manifold Absolute Pressure. Pressure in the intake
manifold after the throttle plate. On a naturally
aspirated engine this varies between 25kPa and
100kPa.
Intake Air Temperature or Manifold Air
Temperature. Refers to the temperature of the air
in the intake manifold. The temperature can be as
much as 150 degrees hotter than the ambient air
temperature on a turbo charged engine.
The density of the air decreases with increasing
temperature. Therefore it’s important to be able to
measure the temperature accurately in order to
determine the engine load.
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