Haltech E6X Manual Win Version - Manual (Page 120)

E6X Manual
120
B.3 Semi Sequential Injection
The ECU can only provide up to 4 separate fuel outputs. For engines with more than 4
cylinders configured for sequential injection, the ECU will operate in a semi-sequential mode.
There are 2 options for semi-sequential injection:
The first requires the user to pair the cylinders adjacent in the firing order. A 6-cylinder
engine with firing order 1-5-3-6-2-4 would have the following injector pairs:
INJ1 cyl 1 and cyl 5
INJ2 cyl 3 and cyl 6
INJ3 cyl 2 and cyl 4
1 5 3 6 2 4
INJ 1 INJ 2 INJ 3
Figure B8. Semi Sequential Injector layout # 1 for 6 cylinder with firing order 1, 5, 3, 6, 2, 4.
This fuel scheme requires a home signal that is driven by the cam so that the ECU knows
what the engine position is in its 720° cycle. The second requires the user to pair the
cylinders opposite in the firing order. A 6-cylinder engine with firing order 1-5-3-6-2-4
would have the following injector pairs:
INJ1 cyl 1 and cyl 6
INJ2 cyl 5 and cyl 2
INJ3 cyl 3 and cyl 4
1 5 3 6 2 4
INJ 1
INJ 2
INJ 3
Figure B9. Semi Sequential Injector layout # 2 for 6 cylinder with firing order 1, 5, 3, 6, 2, 4.
This fuel scheme requires a home signal that is driven by the crank or cam since the ECU
needs to know what the engine position is in its 360° cycle.