Haltech E6A - Manual (Page 103)

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The E6A is capable of triggering from multitooth pickup, as used on a number of production
vehicles. The E6A employs software signal conditioning to convert the multi-tooth trigger to
standard form. This is done by counting teeth from a “synchronisation event” (be it a Home
signal for normal multi-tooth triggers, or by missing teeth on the Motronic systems), until a
certain tooth is encountered which corresponds to the engine location specified as the Trigger
Angle. The E6A then conducts ignition (and possibly injection) timing as normal.
After recognising the synchronisation event, the E6A will locate the first “standard” engine
trigger by the tooth indicated as Tooth Offset in the Ignition Setup. To find the remaining
“standard” engine triggers, the E6A counts a number teeth equal to the total teeth in one CAM
revolution, divided by the number of cylinders, e.g. on a four cylinder Motronic engine, the
following parameters might be set:
Trigger Edge: Rising / Falling (using RA4)
Trigger Angle: 65 (60 to 100° as required)
Trigger Type: Standard / MultiTooth / Motronic / Twin
Total Teeth: 120
Tooth Offset: 5 (0 to [Total Teeth/ # cylinders] as required)
After finding the missing teeth, the E6A will count 5 teeth then produce an internal trigger at
65° BTDC to perform ignition for cylinder 1 (or 4). It will then count 30 teeth and generate a
second internal trigger at 65° BTDC for cylinder 2 (or 3).
Due to the high frequency of multitooth signals, there is a maximum Rpm to which the E6A
ECU will operate. For the Motronic signal, this limit is 9000 rpm. For other multitooth signals,
the limit is 10,500 rpm.
NB: a) A Home signal is required with the Motronic trigger for sequential injection or
Direct Fire 4 cylinder with 4 coils. It is not needed if using wasted spark direct fire, as the
missing teeth act as the Synchronisation Event.
b) When non-sequential injection is chosen with a Motronic type trigger, fuel injection
occurs on detection of the missing teeth. This is done to ensure injection once per revolution
on engines with an odd number of cylinders. Always set Ign/By on Motronic set-ups to 1.
B.5 Twin Triggers and Twin Distributors
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 E6A 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, thus again obviating
the need for a Home.
B.6 Rotary Engines
The E6A 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.