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Classic Goldwing Technical Forums
GL1200
1985 GL1200 Limited ECU Replacement/Upgrade - Part 2
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<blockquote data-quote="Rednaxs60" data-source="post: 229829" data-attributes="member: 4617"><p>Sequential Fuel Injection (SFI) - secondary rotational input required. This is generally the cam shaft rotation keeping the crank rotation as primary. Have mentioned that the second rotational input is for sequential fuel injection, coil on plug (COP) application, and for better engine cycle resolution. Without this second rotational input, the ECU determines the firing of the engine for one crankshaft rotation the starts again. Having the second rotation sensor allows the ECU to determine engine firing over a complete cycle of 720 degrees.</p><p></p><p>Regarding SFI, the benefit is mostly at idle and low powers for emissions and fuel economy. SFI attempts to inject fuel into the cylinder when the intake valve just opens and possibly until the intake valve closes, engine tuning dictates this. </p><p></p><p>In a sequential system, the injectors are fired individually and timed with the cylinders. The ECU controls the pulse with of each injector so that the fuel injector is only flowing fuel to coincide with the opening/closing of the cylinder intake valve.</p><p></p><p>The version of Tuner Studio that I have has a table for up to four cylinders under Sequential Fuel Trim – Injector Cyl 1-4 Trim.</p><p></p><p>Semi-sequential and batch firing are the same, and follow the engine cylinder timing. </p><p></p><p>Reader's Digest version. More to learn, understand and apply.</p></blockquote><p></p>
[QUOTE="Rednaxs60, post: 229829, member: 4617"] Sequential Fuel Injection (SFI) - secondary rotational input required. This is generally the cam shaft rotation keeping the crank rotation as primary. Have mentioned that the second rotational input is for sequential fuel injection, coil on plug (COP) application, and for better engine cycle resolution. Without this second rotational input, the ECU determines the firing of the engine for one crankshaft rotation the starts again. Having the second rotation sensor allows the ECU to determine engine firing over a complete cycle of 720 degrees. Regarding SFI, the benefit is mostly at idle and low powers for emissions and fuel economy. SFI attempts to inject fuel into the cylinder when the intake valve just opens and possibly until the intake valve closes, engine tuning dictates this. In a sequential system, the injectors are fired individually and timed with the cylinders. The ECU controls the pulse with of each injector so that the fuel injector is only flowing fuel to coincide with the opening/closing of the cylinder intake valve. The version of Tuner Studio that I have has a table for up to four cylinders under Sequential Fuel Trim – Injector Cyl 1-4 Trim. Semi-sequential and batch firing are the same, and follow the engine cylinder timing. Reader's Digest version. More to learn, understand and apply. [/QUOTE]
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Classic Goldwing Technical Forums
GL1200
1985 GL1200 Limited ECU Replacement/Upgrade - Part 2
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