Haltech E6S - Manual (Page 99)

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into the compression stroke, one into the exhaust stroke (the waste spark). Both methods mean
that the distributor can be discarded.
With either method, the importance of the setup to the E6S is the number of coils. Each coil
needs its own igniter and ignition output. On a four cylinder using waste spark, two coils are
used, and, therefore, two ignition outputs are needed. In this case, channel 4 is used as the
second ignition channel, making it unavailable for auxiliary outputs. The six cylinder with
waste spark is similar. It requires 3 coils and 3 ignition channels. For this setup, channels 4
and 5 become ignition channels 2 and 3 respectively, and neither is available for Auxiliary
Outputs.
A V8 becomes a little difficult. It requires 4 coils and 4 ignition outputs, but we have no more
available outputs. Therefore, we take one of the fuel drivers and use it as an ignition channel.
The E6S uses channel 1 (marked on the loom as) for this purpose. This channel becomes
ignition channel 4. There is some trade offs with this though. Multipoint is the only available
injection mode. The batch fire and staged modes are not available. For this application the
E6S8 model is required to provide enough power for 8 high impedance injectors. If 8 low
impedance injectors are used in combination with 4 ignition coils then a Haltech External
Driver Box is needed.
There are some other cylinder configurations to consider. 1, 2 and 3 cylinder engines need 1, 2
and 3 ignition outputs respectively. Alternatively, a two cylinder can use one ignition output
and use a direct fire coil with a waste spark. The Direct Fire Option should not be chosen.
This can only be done if the engine is not odd fire. Five cylinder engines can not run Direct
Fire as they can not use waste spark and therefore need 5 ignition outputs. Also, there are not
enough outputs to run Direct Fire on 10 and 12 cylinder engines.
B.2.2 Synchronising
On a distributed engine the E6S does not need to know the engine position. It is told to
generate a spark which the distributor sends to the correct spark plug. With Direct Fire, the
E6S needs to know engine position so that it knows what coil to trigger next. To do this, the
ECU needs to receive a Synchronisation Event (Sync. Event). One form of Sync Event is
missing teeth on a multitooth wheel. The most common Sync Event though, is a Home
trigger. This trigger needs to occur before the main trigger for cylinder (or coil) one, indicating
that the next main trigger is for cylinder one. This trigger should not occur at the same time as
the main trigger.
When the engine is started, the ECU will not generate a spark until it receives a Sync Event.
After that, the ECU fires each ignition output sequentially until it gets to the last output. It
then expects to receive another Sync Event. If it does not receive a Sync, it will not fire
another spark until it does. If the Sync is received, ECU ignition is set back to coil one and the
sequence continues.
The Home trigger must occur before the main trigger each time coil one is to be fired. For
example, on a four cylinder with waste spark, coil one needs be fired once every revolution.
With 4 coils, though, coil one fires once every two revolutions. A cam trigger would be
required for the Home.