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FJR Motorcycle Forums
Technical & Mechanical Problems
Fast Idle Circuit and FI Enrichment
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<blockquote data-quote="ionbeam" data-source="post: 1043170" data-attributes="member: 277"><p>Ahh, posting in haste, I missed the IAT. With no Mass Air Flow sensor the ECU has to do a little extra work, thank goodness it is usually good at math. I was going to PM you but I'm still in a time crunch, so I'm posting the following...</p><p></p><p>At 10k rpm the injectors are firing ~42 times per second. I assume the injectors are poppet type solenoids and not modulated by voltage/current. Your opinion? Monitoring battery voltage is a way to determine if there is sufficient 'pull-in' voltage, or over voltage which could damage the injector. During cranking with a Shorai battery <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> when voltage drops below (?) 8.x volts the ECU stops firing the injectors because cranking RPM would be too slow to start (?) and the injectors would be approaching minimum pull-in voltage (?). My, guessing is such fun! Without actual facts we get to make up the story so it should have a happy ending. <span style="color: #d3d3d3">But, we can get closer to the truth by bundling what facts we do know.</span></p></blockquote><p></p>
[QUOTE="ionbeam, post: 1043170, member: 277"] Ahh, posting in haste, I missed the IAT. With no Mass Air Flow sensor the ECU has to do a little extra work, thank goodness it is usually good at math. I was going to PM you but I'm still in a time crunch, so I'm posting the following... At 10k rpm the injectors are firing ~42 times per second. I assume the injectors are poppet type solenoids and not modulated by voltage/current. Your opinion? Monitoring battery voltage is a way to determine if there is sufficient 'pull-in' voltage, or over voltage which could damage the injector. During cranking with a Shorai battery ;) when voltage drops below (?) 8.x volts the ECU stops firing the injectors because cranking RPM would be too slow to start (?) and the injectors would be approaching minimum pull-in voltage (?). My, guessing is such fun! Without actual facts we get to make up the story so it should have a happy ending. [COLOR=#d3d3d3]But, we can get closer to the truth by bundling what facts we do know.[/COLOR] [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fast Idle Circuit and FI Enrichment
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