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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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<blockquote data-quote="3dogs" data-source="post: 272566" data-attributes="member: 424"><p>Performing the unauthorized TB sync does not add any power. However the amount that each butterfly is open is significant in that the fuel injector for that throttle body will inject an exact amount of fuel based on all the sensor inputs to the ECU. When the fuel map was programmed the same amount of air flow (within a tolerance/range) through each throttle body was assumed by the programmer. If the sync between cylinders is off by more that whatever that tolerance is, some cylinders may run rich or lean depending on more or less air flow.</p><p></p><p>The TB sync that I wrote will however cause most of the 4000/4200 rpm (gen I) vibrations to be eliminated. I have had a dozen FJR riders who attended the Total Control class that I teach ride my bike and they all commented that mine had less vibration than theirs at that engine speed.</p></blockquote><p></p>
[QUOTE="3dogs, post: 272566, member: 424"] Performing the unauthorized TB sync does not add any power. However the amount that each butterfly is open is significant in that the fuel injector for that throttle body will inject an exact amount of fuel based on all the sensor inputs to the ECU. When the fuel map was programmed the same amount of air flow (within a tolerance/range) through each throttle body was assumed by the programmer. If the sync between cylinders is off by more that whatever that tolerance is, some cylinders may run rich or lean depending on more or less air flow. The TB sync that I wrote will however cause most of the 4000/4200 rpm (gen I) vibrations to be eliminated. I have had a dozen FJR riders who attended the Total Control class that I teach ride my bike and they all commented that mine had less vibration than theirs at that engine speed. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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