Haltech E6A - Manual (Page 41)

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These wheels have 58 teeth with a two tooth gap (i.e. 60 teeth positions, with 2
missing). The missing teeth perform the task of the synchronisation event, eliminating
the need for a Home Trigger. Consult Appendix B - The Advanced Features [B.4]
for more information.
Number of Teeth : This field is only available for the Multitooth and Motronic trigger
settings. It is the number of ‘effective’ teeth per cam revolution (2 crank revolutions).
‘Effective’ teeth means to include missing teeth. In the case of the Motronic trigger, the
2 missing teeth are counted, giving 120 teeth per cam revolution.
Tooth Offset : This is the number of teeth from the synchronisation event to the trigger angle.
(For a more involved definition, consult Appendix B - The Advanced Features
[B.4]).
Home Edge : Similar to the Trigger Edge field, this field determines the edge for the Home
signal. If a Reluctor Adapter is being used, this field should be set to Falling.
Spark Mode : The E6A can have multiple ignition outputs. This field indicates if more than
one ignition output is required. See Appendix B - The Advanced Features [B.4] for
more information. The available settings are :
Distributor - This is for a single distributor, single coil ignition system. A slight
variation is the twin spark per cylinder engines, which use two coils and either one or
two distributors, but fire the sparks together.
Twin Distributor - Some V8 and V12 engines use two distributors, one on each bank.
Each distributor has its own coil, and they fire alternately.
Direct Fire -Direct Fire systems do not use a spark distributor. Each spark plug is fired
from its own coil, or (more often than not) companion cylinders are fired together
using twin tower coils Consult Appendix B - The Advanced Features for details on
the requirements for Direct Fire.
Coils on 4Cyl Motor : It is possible to Direct Fire a 4 cylinder engine with either two coils
firing waste spark or 4 coils without waste spark.. This field tells the ECU to use either
2 ignition outputs or 4. (Consult Appendix B - The Advanced Features for details)
Engine Type : Two engine types are selectable through this field - Piston and Rotary. This
field should be set according the to engine type you are using. Rotary must be selected
for the E6A to generate trailing spark ignition signals.
The Ignition Map is adjusted in a similar way to the Fuel Map. The keystrokes are the same,
except that one increment is one whole degree advance or retard. The best way to initially set
up the Ignition Map is to use the Library Maps, and then return to the Ignition Map later if the
ignition curve needs modification. Ignition Library Maps are explained in Chapter 5 [5.4],
Starting the Engine.
An example of an ignition range for a turbocharged engine could look like this :