AFR200 Series, Product User Guide
This document is subject to change without notice.
Caution: None of GAC products are flight certified controls including this item
Copyright © 2010, Governors America Corp., All Rights Reserved
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PUG4144 D
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Adjust the pickup such that there is a nominal .015”-.030” gap clearance between the teeth and
sensor.
4. Secure the speed sensor using the supplied locknut.
5. An AC voltage meter can be used to verify proper magnetic pickup installation. During cranking, sensor
output should be greater than 0.5 VAC.
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If the multi-meter is capable of measuring frequency, the pickup sensor output frequency should
measure at (RPM*flywheel tooth count)/60 = X Hz.
7.2 Manifold Absolute Pressure Sensor (MAP)
The Manifold Absolute Pressure sensor from GAC is available in three different pressure ranges (1, 2, or 3 Bar;
14.5, 29, or 43.5 PSI) supporting up to 30 psig of boost as detailed in the parts list section. Typically, naturally
aspirated engines use the 1 bar model. All three variations have the same mounting footprint and instructions. A
representation of the Manifold Absolute Pressure sensor (MAP) is shown in the following figure.
Manifold Absolute Pressure Sensor Identification
7.2.1 Application Considerations
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The MAP sensor is not required in the event that the multiple-PID functionality is not needed. This
implies that the Governor PID, Fuel PI, Valve Position, and O2 Sensor sensors will be solely based on
engine speed rather than calculated load. If the MAP sensor is not used, it is good practice to tie the input
signal at the AFR to sensor ground to avoid unwanted interaction.
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The MAP sensor has a 6.4mm [0.25 in.] plastic hose barb fitting which can be plumbed directly into the
intake manifold using a port or by using a vacuum hose in between the fitting and the sensor.
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If you are installing the sensor directly to the intake manifold the sensor nozzle must not be angled
greater than 60 degrees from vertical to avoid water intake into the nozzle.
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If you are remotely installing the Manifold Absolute Pressure sensor away from the intake manifold
ensure the selected location is higher than the vacuum connection point.
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Ensure the port is the correct size to ensure a good o-ring seal.
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The recommendation is to mount the sensor with the barb pointing downward to avoid moisture buildup in
the sensor orifice which may lead to incorrect readings.
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The MAP sensor has a two bolt mounting pattern and dimensions as shown in the following figure. Use
this template when determining the appropriate mounting location / pattern and bolt selection.
