Haltech E6K - Manual (Page 118)

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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.
The Home trigger is wired to the same input as the Road Speed. This means that the Road
Speed input, and consequently the Torque Converter Output, cannot be used with Direct Fire.
B.2.3 Coil Set-up
To give an example of how to match up the coils to the ignition outputs, we will use an
example of a V8 with an arbitrary firing order of : 1, 2, 7, 8, 4, 5, 6, 3. The companion
cylinders are the corresponding cylinders in each half. Therefore the companion pairs and
their coil numbers would be : Coil One, cylinders 1 and 4; Coil Two, cylinders 2 and 5; Coil
Three, 7 and 6; Coil Four, 8 and 3. The coil numbers then match up with the ignition Channel
numbers. The diagram below shows how the coils would connect up.
Figure B1. Coil layout for V8 with firing order 1, 2, 7, 8, 4, 5, 6, 3.
It is not necessary for coil one to connect to cylinder one. If, for instance, the original Home
trigger occurs before cylinder 6 (not common, but possible) then coil one would need to
connect to cylinder 6. The coil order would still be the same.