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FJR Motorcycle Forums
FJR Specific Discussion
Sport VS Tour Mode - EXACTLY what is going on?
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<blockquote data-quote="mcatrophy" data-source="post: 1449575" data-attributes="member: 3187"><p>If that's about my preceding post, there's no need for any complication as to how the mode is achieved.</p><p></p><p>A few comments:</p><p></p><p>Anything that changes the F/A ratio would probably take emissions outside the very tight legal requirement. And why bother when you have total CPU control over the engine throttle?</p><p></p><p>Steady state: the engine throttle will be the same regardless of mode, that is certainly my seat-of-the-pants impression, it feels like the same amount of twist to maintain a constant speed. Why have anything different? Yamaha do strongly imply power levels are the same at any throttle setting.</p><p></p><p>Injector duration is programmed to give the required fuel for the current airflow into the cylinders, which itself is purely down to throttle opening. Anything else will change the F/A ratio.</p><p></p><p>Timing curve: I know that on Gen 2 YCC-S bikes, some retardation was used to reduce engine power during a bad gear-change to help equalise shaft speeds either side of the clutch to help it engage. But why do something like that on the Gen 3 when you have total CPU control over the engine throttle?</p><p></p><p>I really think you are trying to add complexity when none is necessary. A simple lag does do what they suggest is done.</p><p></p><p>Of course, what we really need is a two-channel video showing throttle tube and engine throttle. Any volunteers?</p></blockquote><p></p>
[QUOTE="mcatrophy, post: 1449575, member: 3187"] If that's about my preceding post, there's no need for any complication as to how the mode is achieved. A few comments: Anything that changes the F/A ratio would probably take emissions outside the very tight legal requirement. And why bother when you have total CPU control over the engine throttle? Steady state: the engine throttle will be the same regardless of mode, that is certainly my seat-of-the-pants impression, it feels like the same amount of twist to maintain a constant speed. Why have anything different? Yamaha do strongly imply power levels are the same at any throttle setting. Injector duration is programmed to give the required fuel for the current airflow into the cylinders, which itself is purely down to throttle opening. Anything else will change the F/A ratio. Timing curve: I know that on Gen 2 YCC-S bikes, some retardation was used to reduce engine power during a bad gear-change to help equalise shaft speeds either side of the clutch to help it engage. But why do something like that on the Gen 3 when you have total CPU control over the engine throttle? I really think you are trying to add complexity when none is necessary. A simple lag does do what they suggest is done. Of course, what we really need is a two-channel video showing throttle tube and engine throttle. Any volunteers? [/QUOTE]
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FJR Motorcycle Forums
FJR Specific Discussion
Sport VS Tour Mode - EXACTLY what is going on?
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