Haltech E6S - Manual (Page 42)

42
A Multitooth trigger has multiple triggers for each ignition event. The number of teeth
must be a multiple of the number of cylinders. For instance, on a V8 for each engine
cycle (2 revolutions) you would expect there to be 8, 16, 24, 32 etc. The ECU needs to
know if this is the type of trigger being used or else too many sparks and fuel pulses
will be delivered. A multitooth trigger also requires a Synchronisation Event (usually a
Home Trigger) to give the ECU a reference to its position. For more information on
Synchronisation Events consult Appendix E [E.3]. For multitooth triggers, consult
Appendix B - The Advanced Features.
A variation on the multitooth trigger is the Motronic trigger. This setting is designed
to be compatible with the trigger wheel used for Bosch Motronic controlled engines.
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 E6S 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 4 Cyl 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)