Haltech E6K - Manual (Page 123)

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B.7 Rotary Engines
The E6K is capable of providing fuel and spark to twin-rotor Wankel engines, both in direct
fire form or with a distributor. The leading and trailing sparks are generated separately, with a
programmable split between them. The split is programmed through the Rotary Trailing Map.
There are two ranges to the Rotary Trailing Map, below 2000 rpm and above 2000 rpm. This
map is a measure of split, or delay, from the leading spark, which is computed from the base
ignition map normally with all corrections. The map indexes split against the engine load.
When displayed on the Engine Data Page, or in datalogs, the trailing spark timing is shown as
an absolute advance in degrees BTDC.
If using a distributor, there are two ignition outputs, one for the leading and one for the
trailing coils. If using direct fire, the two leading sparks are fired together, as in a waste-spark
set-up. Two individual coils must be used for the trailing sparks, as these are fired separately.
Each coil igniter will have its own trigger. If using direct fire, a Home signal is needed for
trailing ignition to be generated.
Distributor Direct Fire
Output Function Function
INJ1/INJ2 Fuel (Primary) Fuel (Primary)
INJ3/INJ4 Fuel (Secondary) Fuel (Secondary
IGN OUT Leading Spark Leading Spark (both)
DIGITAL OUT 1 Trailing Spark Trailing Spark front rotor
DIGITAL OUT 2 Digital Output Trailing Spark rear rotor
B.8 Nissan Triggers
The Nissan optical trigger sensor is used by almost every ECU controlled Nissan engine. It is
a sensor that spins at half the engine speed, and is therefore able to measure the 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 home signal consists of 360 evenly spaced pulses, where each falling edge represents 2
degrees of engine movement.
The trigger signal consists of the same number of pulses as the engine has cylinders, so on a 4
cylinder there are 4 pulses, and on a 6 cylinder there are 6 pulses. The beginning of the pulses
(rising edge) are evenly spaced, but the end of the pulses (falling edges) are not evenly spaced
since the trigger pulses are of different sizes as described below. The differing pulse widths
enables the ECU to determine which pulse occurs immediately before cylinder number 1, the
ECU does this by counting the number of home pulses that occur during the trigger pulse.
There are a number of different trigger window patterns, two common patterns are described
below: