Haltech E6A - Manual (Page 102)

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The E6A can only provide 4 fuel outputs, therefore it cannot control each cylinder’s injection
on an engine with more than 4 cylinders. For 6 or 8 cylinder engines, the E6A can operate in a
semi-sequential mode. With the Ign / By set to 2, each injection will occur once per engine
cycle. The injectors need to be paired to cylinders adjacent in the firing order. For example, on
a six cylinder engine with firing order 1-5-3-6-2-4, the injector would be paired to fuel
channels as follows :
Channel 1 INJ1/INJ2 cyl 1 and cyl 5
Channel 2 INJ3/INJ4 cyl 3 and cyl 6
Channel 5 Aux Out 2 cyl 2 and cyl 4
Channel 4 is not used for fuel and is therefore left available as an Auxiliary Output.
The Sequential Injection Mode on a 12 cylinder engine is not really sequential at all, but a form
of extended Batch Fire. The E6A will fire the injectors as three groups of four injectors (uses
three outputs.) With the Ign / By set to 2, the injectors will each fire once per revolution. This
injection mode has proved useful in reducing fuel pressure fluctuations in the fuel rails on V12
engines. The Individual Injector Trim is still applied to each channel, so group the injectors by
flow rate and set an appropriate correction.
Sequential injection on 5 and 10 cylinder motors is not possible with the E6A.
Important Notes
1. The E6A as yet has no means of programming the firing order of the engine in
software. It uses the channels sequenced in the order mentioned previously. Therefore, it is
necessary to wire the injectors according to the firing order.
2. The Sequential Injection Mode can not be used in conjunction with Direct Fire Ignition
Mode except on 1 or 2 cylinder engines. If both modes are selected with more the 2 cylinders,
the E6A will choose the ignition function in preference to the fuel function.
3. The Table in section B.7 should be consulted to determine if a particular configuration
is possible.
B.3.3 Synchronising
To be able to synchronise the injectors with the motor, the E6A needs a Synchronisation
Event, usually in the form of a ‘Home’ Trigger to operate in sequential mode. The Home
trigger is separate from the main trigger and it tells the ECU that the next injection is to be for
channel 1. Each injection is calculated from a main trigger. The first trigger after a Home
trigger calculates injection for channel 1. Each main trigger after that will sequence through the
channels in the order mentioned earlier. i.e. the order will be channels 1, 2, 5 and lastly 4 (if all
four are used). If the Home trigger does not occur, however, injections will continue, but
injector synchronisation cannot be assured until the home pulse is received again.
B.4 Multitooth Triggers