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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: 1316680" data-attributes="member: 30139"><p>Hey Mr C.,</p><p></p><p>Now I remember. You are correct, Roger found that the BMW Motronic ECU still uses the O2 sensor input even in open loop mode. So even with a scaled, tweaked wideband input it is still working and if you scale it the right way you can spoof it to richen or lean out the AFR, you just can't target an AFR in that area in closed loop. I actually would be surprised to find the Yamaha ECU did not behave this way with a properly set up LC2. This fact (using the OEM O2 sensor input in open loop) was one of the downsides to the PC3WB on the GS, as it does not use the factory O2 wiring into the ECU, it goes directly into the PC3. So the WB sensor cannot affect open loop area off the shaded gray in the above map. But you can program all the map cells as with any PC3. That is IIRC, being so old and retired <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/smile.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>However I get back to PCV + AT. It covers the entire rpm/throttle grid closed loop so in principle it should be able to work better than any open loop or partially closed loop system, once we get over this dithering and associated issues. It sure would be nice to have a painless way to collect data off the FJR.</p><p></p><p>AJ</p></blockquote><p></p>
[QUOTE="ajpagosa, post: 1316680, member: 30139"] Hey Mr C., Now I remember. You are correct, Roger found that the BMW Motronic ECU still uses the O2 sensor input even in open loop mode. So even with a scaled, tweaked wideband input it is still working and if you scale it the right way you can spoof it to richen or lean out the AFR, you just can't target an AFR in that area in closed loop. I actually would be surprised to find the Yamaha ECU did not behave this way with a properly set up LC2. This fact (using the OEM O2 sensor input in open loop) was one of the downsides to the PC3WB on the GS, as it does not use the factory O2 wiring into the ECU, it goes directly into the PC3. So the WB sensor cannot affect open loop area off the shaded gray in the above map. But you can program all the map cells as with any PC3. That is IIRC, being so old and retired [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/smile.png[/IMG] However I get back to PCV + AT. It covers the entire rpm/throttle grid closed loop so in principle it should be able to work better than any open loop or partially closed loop system, once we get over this dithering and associated issues. It sure would be nice to have a painless way to collect data off the FJR. AJ [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Power Commander V w/Autotune Discussion
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