Haltech E6X Manual Win Version - Manual (Page 163)

E6X Manual
163
Mitsubishi Triggers
The Mitsubishi trigger comes in a few different forms, but the output waveforms are very
similar. It is a cam sensor and consequently spins at half the engine speed, and is therefore
able to measure the full engine cycle position, so can be used as a trigger for direct fire and
sequential injection applications. The sensor consists of two signals, which will from now on
be referred to as home and trigger. The Trigger signal consists of four evenly spaced pulses
for each cylinder and the Home signal consists of two unique pulses, 360 deg apart (1 rev).
Shown below id the EVO VIII cam sensor output, but it is very similar to all EVO and VR4
types.
Time
Voltage
GND
+5V
GND
+5V
Crank
Angle
Sensor
Output
Cam
Angle
Sensor
Output
No.1 TDC
75 deg BTDC
Through observation of the trigger above, it can be seen that the rising edge of the Crank
signal (Trigger on Haltech), occurs at 75 deg BTDC for each cylinder, which is perfect for the
Haltech ECU. This would give a Trigger Angle BTDC of 75 deg in the Trigger Setup page.
The Cam signal has two pulses, one at the pulse for cylinder number 1 and one at the pulse for
the third cylinder to fire. For the ECU to synchronise correctly, it must receive the Home
(Cam signal), after the pulse for the forth cylinder to fire and before the pulse for the first
cylinder to fire. The rising edge of the larger of these two Home pulses occurs within this time
and we would therefore set the Home edge to rising in the Trigger Setup page.
To use the above trigger with the E6X ECU, you will be limited to Batch Injection and Waste
spark Ignition, due to the fact there are two Home pulses. If Sequential injection or four coil
Direct fire ignition are to be used, the second pulse must be eliminated. The Trigger Type for
this trigger must be set to Standard trigger in the Trigger Setup page.