Air Fuel ratios not so straight forward
Yes, grimreaper and northerngn nailed it. You have to know the scale of the wide band sensor meter you are using. They all use oxygen content to calculate the air fuel ratio. XFI will allow switching from Gasoline's FEC constant, to other fuel's stoichiometric reading to show that fuel's relationship to lamda. Most others will not. Therefore you need a translation table to help understand the relationships
I have put a little table together that may be of use in using A/F meters calibrated to gasoline, when you are using E-70, E-85 and E-100 fuels.
To use the table, look at the A/F ratio you want in the column for the fuel using, then look at the A/F ratio for the calibration of the meter used in the same row. Hope it is of use.
Here is a sample:
Lamda . A/F Gas . A/F E‐70 . A/F E‐85 . A/F E‐100
1.027. . 15.1 . . . .10.89 . . . 10.03 . . . .9.25
1.014. . 14.9 . . . .10.74 . . . .9.90 . . . .9.13
1.000. . 14.700 . . 10.600 . . .9.765 . . .9.0078 Stoichiometric
0.986. . 14.5 . . . .10.46 . . . .9.63 . . . .8.89
0.973. . 14.3 . . . .10.31 . . . .9.50 . . . .8.76
0.959. . 14.1 . . . .10.17 . . . .9.37 . . . .8.64
0.946. . 13.9 . . . .10.02 . . . .9.23 . . . .8.52
0.932. . 13.7 . . . . 9.88 . . . . 9.10 . . . .8.40
0.918. . 13.5 . . . . 9.73 . . . . 8.97 . . . .8.27
0.905. . 13.3 . . . . 9.59 . . . . 8.84 . . . .8.15
Had to zip the file due to file size restrictions. Should be expanded