Haltech E6K - Manual (Page 122)

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B.5 Motronic Style Triggers
Motronic Style Triggers are a type of multi-tooth trigger but are distinct in that they use a
missing tooth instead of a separate home signal to synchronise the ECU with engine position.
The motronic wheels supported by the E6K ECU to date are those driven by the crank only
and are limited to wheels with 60 teeth with 2 missing and 36 teeth with 1 missing. The
motronic wheel operates identically to any other multi-tooth wheel with the following
exceptions:
- Care must be taken when selecting a Tooth Offset. If the tooth offset is selected
such that it will cause the missing tooth to be required to perform a trigger, incorrect
trigger timing and poor engine operation will result. In figure B5.1 the solid lines show
where a 4 cylinder cannot select a tooth offset and the dashed line shows where a 6
cylinder cannot select a tooth offset. These teeth will cause a trigger at the missing
tooth. This rule applys for all motronic style wheels.
-
Synchronisation required for sequential fuel injection or full direct fire cannot be
accomplished without a Home signal driven by the Cam.
-
Due to the high frequency of the motronic signal and complexity of detecting the
missing tooth, the maximum rpm to which the ECU will operate is 9000 rpm.
Figure B5.1 – Ford 36-1 motronic style wheel
B.6 Twin Triggers
The Twin Trigger is designed for two purposes. It can be used to provide direct fire ignition
on 2 cylinder engines (most motorbike twins) without the use of a Home sensor. The E6K
Main Trigger input fires coil 1, and the Home input is used to fire coil 2. The Twin Trigger
can also be used to differentiate between coils on an 8 or 12 cylinder using twin distributors.
Two four (or six) cylinder distributors, complete with trigger wheels can be used. No home is
required in this configuration.