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FJR Motorcycle Forums
Technical & Mechanical Problems
Audiovox Cruise Control-Problem Solved?
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<blockquote data-quote="ionbeam" data-source="post: 432627" data-attributes="member: 277"><p>I’m not sure how Yamaha has worked out the vacuum ports on the FI rail. I know that in a conventional carb intake the TBS ports are taken from the center of the carb’s venturi or at the fuel transfer slots. The FJRs TBS port is actually an air bleed adjustment. With no diode the two TBs are sharing a common vacuum level/air bleed. The fuel pressure regulator (Gen I) and the MAP sensor (Gen I) have ports that are most likely positioned in the throttle bodies so that ganging them together doesn’t matter. Additionally, the volume displacement of the FP regulator and MAP sensor is very tiny, whereas the AVCC vacuum diaphragm is a much larger and very dynamic in volume changes. That said, I did run my AVCC for a short time with several TBS ports ganged together sans diode and it didn’t seem to make any difference. I did put in individual diodes because I felt it was the right thing to do.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 432627, member: 277"] I’m not sure how Yamaha has worked out the vacuum ports on the FI rail. I know that in a conventional carb intake the TBS ports are taken from the center of the carb’s venturi or at the fuel transfer slots. The FJRs TBS port is actually an air bleed adjustment. With no diode the two TBs are sharing a common vacuum level/air bleed. The fuel pressure regulator (Gen I) and the MAP sensor (Gen I) have ports that are most likely positioned in the throttle bodies so that ganging them together doesn’t matter. Additionally, the volume displacement of the FP regulator and MAP sensor is very tiny, whereas the AVCC vacuum diaphragm is a much larger and very dynamic in volume changes. That said, I did run my AVCC for a short time with several TBS ports ganged together sans diode and it didn’t seem to make any difference. I did put in individual diodes because I felt it was the right thing to do. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Audiovox Cruise Control-Problem Solved?
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