Haltech E6X Manual DOS Version User Manual
Page 125
E6X Manual
125
4
1)
Number
(Cylinder
2
cylinders
of
Number
Pulses
of
Number
6)
Cylinders
of
Number
and
3)
or
(2
Number
(Cylinder
or
4)
Cylinders
of
Number
and
2
Number
(Cylinder
if
4
2
cylinders
of
Number
Pulses
of
Number
1
number
Cylinder
of
opposite
is
Number
Cylinder
if
4
1
2
cylinders
of
Number
Pulses
of
Number
1
Number
Cylinder
if
Ч
−
−
=
=
=
=
=
Ч
=
Ч
+
=
=
Cyl. 4 Window
Cyl. 1 Window
Cyl. 6 Window
Nissan 6-Cylinder Trigger 2
Because this trigger point normally falls well before the ideal position for the ECU to trigger,
a second parameter is added which allows the actual trigger position to be offset. This
parameter is labelled “Tooth Offset” and it allows the ECU to process the trigger at a position
given by a set number of home pulses after the trigger rising edge. So that the home will be
processed before the trigger is processed for cylinder number 1, the pulse offset must force
the trigger to occur after the end of the trigger pulse. For this reason, the actual pulse offset is
equal to the number of pulses set from the “Home Window Teeth” parameter added to the
number of pulses specified by the “Tooth Offset” parameter. So if the “Home Window Teeth”
parameter is set to 16, and the “Tooth Offset” parameter is set to 10, then the actual trigger
will occur at 10+16=26 pulses after the rising edge of the trigger. In this way, even if the
“Tooth Offset” parameter is set at 1 (the minimum value allowable), the home will always be
processed before the trigger. A major advantage of being able to specify this Tooth Offset, is
that the actual trigger position can be retarded so that the “Trigger Angle” can be set to a
value of approximately 50 degrees which is ideal for good acceleration ignition response,
especially during start-up.