MoTeC M84 - Manual (Page 17)

MoTeC Installation 15
Installation
Throttle Position or MAP Load Sensing
The load point for the fuel and ignition calibration tables may be based on any
defined load measuring sensor.
The most commonly used are the Throttle Position sensor or the MAP
(Manifold Pressure) sensor.
Turbo Charged Engines
Normally use Manifold Pressure load sensing (connect the MAP sensor to the
inlet manifold).
A Throttle Position sensor is optional and will be used for acceleration
enrichment if fitted.
Normally Aspirated Engines
Normally use Throttle Position load sensing.
The MAP sensor may be used to compensate for barometric pressure
changes by venting it to atmospheric pressure.
If Idle Speed Control is used then the MAP sensor should be connected to the
plenum or Manifold Pressure load sensing should be used. This is required so
that the fuel is varied as the idle speed control valve opens and closes.
Sensors
Throttle Position Sensor
The Throttle Position sensor must be a potentiometer type, older switch types
are not suitable. The sensor will produce a voltage proportional to the angle of
the throttle plate.
Throttle sensors generally have a dead band at either end and must be pre-
loaded to avoid the dead band.
The Setup Parameters TPHI and TPLO must be set to indicate the fully
closed and fully open positions. These parameters must be set any time the