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FJR Motorcycle Forums
Technical & Mechanical Problems
PC III and O2 Sensor Question
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<blockquote data-quote="Gitbox" data-source="post: 1248937" data-attributes="member: 86950"><p>More great info! Thanks guys. <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/specool.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>BigJohn: I got the PC III for the surging and lurching issues at low RPM. I didn't need any more power. <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/thumbsupsmileyanim.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Fred: Agree with the EPA comment.</p><p></p><p>At the risk of beating this subject to death, here's a couple more thoughts: if the surging is caused by the ECU going into closed loop mode, then disconnecting the O2 sensor should have a positive effect, right? If it has no effect, then it means that the engine is just running too lean at those RPMs? (based on all the maps that show a pretty large increase in injector time at 3.5 k RPM and under)</p><p></p><p>Yes, I know what DynoJet recommends, but I think they are more into squeezing out more power than they are into smoothness.</p><p></p><p>And yes, I am still fiddling with this mostly as a learning experience. This FJR is my first EFI bike! (carbs suck... uh oh, shouldn't have wrote that. <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />)</p></blockquote><p></p>
[QUOTE="Gitbox, post: 1248937, member: 86950"] More great info! Thanks guys. [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/specool.gif[/IMG] BigJohn: I got the PC III for the surging and lurching issues at low RPM. I didn't need any more power. [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/thumbsupsmileyanim.gif[/IMG] Fred: Agree with the EPA comment. At the risk of beating this subject to death, here's a couple more thoughts: if the surging is caused by the ECU going into closed loop mode, then disconnecting the O2 sensor should have a positive effect, right? If it has no effect, then it means that the engine is just running too lean at those RPMs? (based on all the maps that show a pretty large increase in injector time at 3.5 k RPM and under) Yes, I know what DynoJet recommends, but I think they are more into squeezing out more power than they are into smoothness. And yes, I am still fiddling with this mostly as a learning experience. This FJR is my first EFI bike! (carbs suck... uh oh, shouldn't have wrote that. [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/grin.gif[/IMG]) [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
PC III and O2 Sensor Question
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