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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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<blockquote data-quote="jestal" data-source="post: 92106" data-attributes="member: 477"><p>I don't think the O2 sensor input is going to affect much regarding the sync when injectors are disconnected and/or the engine RPM is elevated off idle. The vacuum levels read in the ports via the mercury tubes are caused by the pumping of the engine and the throttle restriction. Little or nothing to do with the air/fuel ratio as determined by the O2 sensor and the closed loop fuel correction routine. You can watch the vacuum levels before and after disconnecting the injector and it changes very very little even between the cylinder running and dead so a slight change in the air/fuel ratio isn't likely to affect the sync.</p><p></p><p>I wasn't trying to fix anything, per se. Just curious as to how close the throttle linkage was syncronized vs. just the idle sync. For idle quality and just off idle the idle sync is obviously pretty important. For running down the road the throttle linkage determines the majority of the sync as the air flow is way beyond what the idle bypass circuits (idle air screws) will provide.</p></blockquote><p></p>
[QUOTE="jestal, post: 92106, member: 477"] I don't think the O2 sensor input is going to affect much regarding the sync when injectors are disconnected and/or the engine RPM is elevated off idle. The vacuum levels read in the ports via the mercury tubes are caused by the pumping of the engine and the throttle restriction. Little or nothing to do with the air/fuel ratio as determined by the O2 sensor and the closed loop fuel correction routine. You can watch the vacuum levels before and after disconnecting the injector and it changes very very little even between the cylinder running and dead so a slight change in the air/fuel ratio isn't likely to affect the sync. I wasn't trying to fix anything, per se. Just curious as to how close the throttle linkage was syncronized vs. just the idle sync. For idle quality and just off idle the idle sync is obviously pretty important. For running down the road the throttle linkage determines the majority of the sync as the air flow is way beyond what the idle bypass circuits (idle air screws) will provide. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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