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FJR Motorcycle Forums
Technical & Mechanical Problems
Power Commander V w/Autotune Discussion
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<blockquote data-quote="ajpagosa" data-source="post: 1316633" data-attributes="member: 30139"><p>Well if you go back to post #18, look at map 001, and compare to the AFR table I posted above (also from map 001), you'll see some interesting stuff.</p><p></p><p>Namely that Yamaha ECU was running far leaner in the lower throttle, lower rpm/throttle % range (judging by how much fuel the 001 map adds) and much richer in the higher throttle areas (judging by how much fuel the 001 map takes out) to hit the AFR's in the table. Indicating that the Yamaha ECU went way richer under accel and way leaner at cruise, or at least does so in open loop mode with the O2 sensor disconnected.</p><p></p><p>Anyway theory is one thing, reality another, and implementation trumps both. In our case (gen 2 FJR) it looks like the main thing plaguing us might be the dithering the ECU does in its (formerly) closed loop operation area, combined with the DJ/AT quirks leading to poor drivability. The actual tenths of a point of AFR in the target table either way I suspect has little to do with anything substantive yet. IOW I bet you could slap say 13.5 into every cell in the AFR table and not notice much change seat of the pants or smoothness, except maybe fuel economy.</p><p></p><p>However, like I did recently, starting from base map of all zeros, that was a huge improvement in seat of the pants, smoothness, and drivability because it for whatever reason got around the implementation issues of the (possibly) too aggressive DJ maps + Yamaha ECU's closed-loop-area dithering + AT cross-talk with all of it. Is it optimal for power/economy? Who knows, I doubt it. But neither is much of a concern if it is unridable.</p></blockquote><p></p>
[QUOTE="ajpagosa, post: 1316633, member: 30139"] Well if you go back to post #18, look at map 001, and compare to the AFR table I posted above (also from map 001), you'll see some interesting stuff. Namely that Yamaha ECU was running far leaner in the lower throttle, lower rpm/throttle % range (judging by how much fuel the 001 map adds) and much richer in the higher throttle areas (judging by how much fuel the 001 map takes out) to hit the AFR's in the table. Indicating that the Yamaha ECU went way richer under accel and way leaner at cruise, or at least does so in open loop mode with the O2 sensor disconnected. Anyway theory is one thing, reality another, and implementation trumps both. In our case (gen 2 FJR) it looks like the main thing plaguing us might be the dithering the ECU does in its (formerly) closed loop operation area, combined with the DJ/AT quirks leading to poor drivability. The actual tenths of a point of AFR in the target table either way I suspect has little to do with anything substantive yet. IOW I bet you could slap say 13.5 into every cell in the AFR table and not notice much change seat of the pants or smoothness, except maybe fuel economy. However, like I did recently, starting from base map of all zeros, that was a huge improvement in seat of the pants, smoothness, and drivability because it for whatever reason got around the implementation issues of the (possibly) too aggressive DJ maps + Yamaha ECU's closed-loop-area dithering + AT cross-talk with all of it. Is it optimal for power/economy? Who knows, I doubt it. But neither is much of a concern if it is unridable. [/QUOTE]
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Power Commander V w/Autotune Discussion
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