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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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<blockquote data-quote="PA1195" data-source="post: 272239" data-attributes="member: 2660"><p>Hello, JC's likely correct about the smoothness versus necessity...vacuum taps from all four throttle bodies exit next to the capped ones we use to do an idle/cruise sync, and are connected and fed to the single input on the intake manifold pressure sensor on the top left of the fuel rail...from what I read the ECU uses an averaged vacuum value from that sensor converted to voltage to determine intake pressure, that's then converted to air flow volume (load) by the ECU with the help of the TPS...when used in conjunction with data from engine speed, crank position, intake air temp, and exhaust O2 info, the ECU sets injector output/timing and ignition timing...so making an adjustment to just one TB would likely have a diluted effect to the intake sensor output...but may help with the vibration and harmonics we feel as ops...keeping all outputs around 250mm at idle as recommended probably is important as the Shop book asks for it to be there for some obscure reason, probably to give the ECU a proper starting point as you noted.</p><p></p><p>Gary in Fairbanks</p></blockquote><p></p>
[QUOTE="PA1195, post: 272239, member: 2660"] Hello, JC's likely correct about the smoothness versus necessity...vacuum taps from all four throttle bodies exit next to the capped ones we use to do an idle/cruise sync, and are connected and fed to the single input on the intake manifold pressure sensor on the top left of the fuel rail...from what I read the ECU uses an averaged vacuum value from that sensor converted to voltage to determine intake pressure, that's then converted to air flow volume (load) by the ECU with the help of the TPS...when used in conjunction with data from engine speed, crank position, intake air temp, and exhaust O2 info, the ECU sets injector output/timing and ignition timing...so making an adjustment to just one TB would likely have a diluted effect to the intake sensor output...but may help with the vibration and harmonics we feel as ops...keeping all outputs around 250mm at idle as recommended probably is important as the Shop book asks for it to be there for some obscure reason, probably to give the ECU a proper starting point as you noted. Gary in Fairbanks [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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