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Lambda CIS
Hello,
"So my question is, … is there anybody running an AFR gauge/display with a proper idle CO setup of 0.5% who can confirm such low AFR results with a very rich resuting mixture at high rpm’s or at least tell me what AFR value is resulting at WOT or passing the 30% throttle position?"
In response to your above question – I have a 1982 US SC with a fully functioning Lambda control system and an additional bung in my cat bypass running a AEM wideband A/F ratio gauge in my dash.
I do not have a CO meter to set idle mixture so I disconnect the O2 sensor ( as per factory direction) and set idle A/F mixture utilizing AEM gauge. I have the idle mix set at about 12.8 which when Past 1/3 throttle( with O2 sensor reconnected) results in an A/F ratio of right at 12.5. I realize that the – O2 sensor disconnected - idle mixture is a bit rich but this does not concern me due to the fact that with the O2 sensor connected the Lambda system corrects this to dithering mixture between about 14.3 to 14.9 with the same at cruse below 1/3 throttle, the only time not around Stoich is with a cold engine and past 1/3 throttle when it goes to 12.5. The car runs extremely well at all speeds.
Anyway, I hope this is some help.
Dave
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