OMEM710 Hardware Manual 2v11
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The fuel injectors may be assigned as primary or secondary injectors. This feature allows two banks
of injectors to be fitted to each inlet.
19.1 Twin Injectors
If using two injectors per cylinder to allow greater fuel flow, typically on high boost turbo engines, the
ECU can automatically assign pulsewidth greater than the user defined Pri Inj Duty Max to the
second set of injectors.
when using double injectors, this is the maximum duty cycle the primary
injectors will reach before extra pulsewidth is sent to secondary injectors
hysteresis for the automatic staged injectors as injectors will not react to
very small pulse widths. This is the minimum pulse width that will be
sent to the secondary injectors.
If using two different sized injectors, this option must be used to allow for
this. Primary Size % = (Primary flowrate / Secondary flowrate) x 100.
19.2 Staged Injectors
If using two sets of injectors arranged upper and lower banks where the upper bank is used for
increased power at high rpm, the Fuel Difference table allows you to assign different percentage of
the fuel pulsewidth to each bank.
The Fuel Difference table describes the percentage of the mapped pulse width at any given load
and speed to be sent to the secondary injectors. The remaining pulsewidth will be sent to the
primary injectors. eg if the map reads 20, then 20% of the pulsewidth will go to the secondary
injectors, and 80% to the primary.
This table is only used when the Fuel Diff Input is satisfied. This can be always satisfied by setting
an input of Switch Always ON.
The values set in the twin injector options still apply when using the Fuel Diff table.
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