voltage vs. A/F ratio

[yo2001]

what is the 1.0v on the A/F ratio gauge equivalent to the A/F ratio? 10 to 1? Is that too much fuel?

[Guest Anonymous]

Unless my understanding of a O2 sensor is incorrect, 1v is max richness. The narrow band 02 sensor works from .1 v (maximum leaness) to 1v (maximum richness), alot of them will have 10 lights, each one equaling .1 volts. So in my opinion from the way I understand it, that would be very rich.

 

Regards,

 

Lone

[yo2001]

How rich is 1 volt though? I can't remember.

[240Z Turbo]

It is not equivalent to any particular AFR, but you can say it is rich. I have found on my car that I can tune to .95V that would seem to be rich, only to dyno the car and find it to be 14.2:1 at full boost. I have learned that the O2 in some applications is useless under boost. EGT is the only reliable tool to use besides a wideband O2. GN gu

[SHANE]

what James said, i was whatching my O2 volts while on the dyno, and in my case .820 volts (not that rich to me) showed up as 11.7-11.9 on the wide band.

[BLKMGK]

Exhaust temp effects narrow band and wide band O2s alike. This is why the tmep on a wide band is regulated. Narrow band O2s just aren't worth it for tuning IMO. As for EGTs - too slow. By the time there's trouble showing on an EGT it's likely too late. I datalog my EGT and other sensors and from what I can see the EGT always lags behind. Still good to have for warning purposes though IMO. I will have several RTD EGT when I finally go single on my 2JZGTE.

 

IMO a W/B is the way to go if you can swing the cost of entry.