A/f Guage And O2 Sensor Relationship

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02-20-2003, 10:44 AM

#11

j9fd3s

Senior Member

Join Date: May 2002

Location: California

Posts: 22,465

i've tested this. the stock ecu looks at the 02 sensor under 3200rpms. at idle the airpump throws off the reading so they cannot run it closed loop, over about 1500rpms and under 1 psi boost it should be going back and forth (closed loop). over 3200rpms or 1psi it goes open loop, and it will just read full rich

mike

02-20-2003, 10:04 PM

#12

Tom93R1

Senior Member

Join Date: Nov 2002

Location: PHX

Posts: 265

Quote:

Originally Posted by R1TT' date='Feb 19 2003, 09:04 PM

I think you gotta remember that the stock o2 is a narrow band o2, its use on the stock ecu is to keep it stoic in closed loop which is usually light part throttle and idle, mine seem to stay on the rich side as well during idle but it's not to say that the o2 is still not cycling, its probably cycling on the rich side, narrow o2 supposd to be 0.01-0.9v-lean to rich, a proper working o2 should cycle

anyone else think that those pos air/fuel gauge's are kinda useless (for tuning), I think the only good use it has is that you can tell if your running lean, not so good for tuning

I think for more accurate tuning and real a/f's you gotta go wide band, but I guess that's just in my opinion

Exactly :bigok:

I have logged O2 sensor data with my PFC and datalogit and have determined anything information you try and get off the O2 sensor is completely worthless. The O2 is somewhat accurate at what, 14.7? I dont think an rx7 will idle very well at that afr, it needs to be more rich than that which is why the air/fuel flashy lights dont bounce back and forth at idle. After several data logging sessions I have decided that logging anything is completely useless until I get a wide-band.