AFR to 02 volts reading on Scanmaster

[RatFink]

Is there a chart that shows what your Air Fuel Ratio is in relation to what the scanmaster shows on the 02's?

 

[Razor]

No. Its all about guessing. The lower the number, the leaner it is.750 is leaner than 800.

HTH

If you want AFR..get a wide band

 

[1BADDAM]

It's more of a switch than an analog device.

 

[Quiky One]

Haha that graph is way off. I typically run .760's-780's and I know I am not running 14.0:1...I would blow if it was that lean.

Jason

 

[SNOWBIRD]

I Tend To Believe The More You Modify Heads And Turbo ,, Cam Shaft The Less Accurate Your ...nb...(oxygen Sensor) Becomes And Thus A Wide Band Is Needed To Properly Tune Your 109....this Is What I Believe....anybody,, Educate Me

 

[Razor]

The narrow band is also sensitive to temperature. Example if you run lower timing it will raise your EGT and lower your O2 sensor voltage.

Not saying you cannot tune with a narrowband, I have personally seen a 109 motor tuned into the mid 9's on a scanmaster and (afs20)narrow band sensor.

The wideband when accurrate saves times and parts breakage.