Haltech E6X Manual DOS Version - Manual (Page 12)

E6X Manual
12
1.3 Expanded Installation Guide
1.3.1 Manifold Absolute Pressure (MAP) Sensor
The MAP sensor is used to convert the manifold pressure into an electrical signal for the ECU
to use. The MAP sensor is used to measure engine load or barometric pressure depending on
the application. The sensor works in absolute pressure that means when the sensor is used to
measure manifold pressure, the pressure reading in the manifold does not need compensation
due to changes in barometric pressure. Since the MAP sensor is an absolute pressure sensor it
can be used in some situations to measure changes in barometric pressure that in some
applications will have a great affect on air-fuel mixtures (Refer Barometric Correction, p74).
There are three types of MAP sensors that can be used with the ECU. The sensor required
depends on the engine set-up.
1 Bar Sensor (Part No.: 039 4070 or 16137039)
( -100kPa to 0 kPa) Normally Aspirated Engines
2 Bar Sensor (Part No.: 886 3189 or 16254539)
(-100kPa to 100kPa) Turbo or Supercharged
Engines up to 100kPa boost
(15 psi , 1 atmosphere)
3 Bar Sensor (Part No.: 749 3169 or 16040749)
(-100kPa to 200kPa) Turbo or Supercharged
Engines up to 200kPa boost
(30 Psi, 2 atmospheres)
Note: Make sure you have the correct MAP sensor for your engine. The first
three digits of the part number are stamped on the sensor housing.
Engines that use Manifold Pressure as a load reference require an appropriate
MAP sensor to be connected to the MAP Input plug on the wiring loom.
Engines that use Throttle position load sensing do not need a MAP sensor to
measure Manifold pressure but require barometric correction. A MAP sensor
can be used for barometric compensation in the place of the barometric
pressure sensor inside the ECU. This MAP sensor must be a 1 Bar MAP
sensor (left open to atmosphere) and is connected to the Spare Input plug near
the Main Connector. For more information about barometric compensation
(Refer Barometric Correction, p74)
Mounting