Haltech E6M - Manual (Page 120)

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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 E6H/E6M 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 or 2 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
E6H/E6M 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.