Still not answered the question:
What provides the voltage to that individual made AFR gauge?
Is it the original narrowband signal (where here I think it's not) or a voltage signal from a wideband controller? If yes, then in the gauge at what voltage is AFR 14.7:1 (Lambda 1) present ??
I ask cause ... maybe the gauge expects a different voltage which equals Lambda 1 / AFR 14.7:1.
So ... 2.35, 2.45, 2.5 or even higher volts.
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Originally Posted by Funracer
I can super richen it by turning the mixture screw to force the system to 14.4 at idle, but then it will be so rich it surges badly and won’t start (too rich).
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No you can't, you did not understand what the lambda control of the ECU does --> no matter if you turn the CO screw for enrichment, at the end with closed loop control the ECU forces the Mixture to result in Lambda 1. So if you enrichen the mixture with the CO screw the ECU simply will decrease the duty cycle to make it result in Lambda 1 again.
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I do have SSI exhaust but surely it would not make that much difference at idle.
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Surely? :-)
It does make a difference. Cause the sensor in an SSI system at idle will result significantly colder than with its position in the original exhaust system, means much nearer to the exhaust port of the head and especially in front of the CAT which will make the sensor resulting much hotter at idle and therefore running more precise. And I guess you deactivated the ignition retard function at idle by disconnecting the second hose at the back side of the dizzy can? If yes, then your sensor will result even colder, cause the original retarded ignition timing with 5° ATDC at idle will let the exhaust flow result hotter at idle compared to the regular ignition timing using 5° BTDC.
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At cruise throttle AFR waivers around 14.3 goes to about 13.5 at WOT.
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Yes thats common, ... the original ECU only rises the duty cycle to static 65% at WOT, which does not result in the needed AFR 12.5:1 (lambda 0.85) for optimal combustion power, but in 13.5:1. Thats due to keep over all emissions within the limits in these years.