MoTeC M8 - Manual (Page 16)

14 Installation
Installation
Throttle Position or MAP Load Sensing
The load point for the fuel and ignition calibration tables may be based on the
Throttle Position sensor or the MAP (Manifold Pressure) sensor.
Turbo Charged Engines
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.
Partial barometric pressure compensation will be achieved using the MAP
sensor only. For improved compensation an additional pressure sensor must
be connected to the Aux V input on M4 & M48 (EMAP on M8) and the load
calculation method should be selected as MAP / Aux V for M4 & M48 (MAP /
EMAP for M8). This additional sensor should be vented to atmospheric
pressure.
Normally Aspirated Engines
3D Fuel and Ignition Tables
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.
2D Fuel and Ignition Tables
Use Manifold Pressure load sensing, see Turbo Charged Engines above. Not
suitable for multi-runner engines, engines with erratic pressure readings, or
very low vacuum.