I'm looking for input.
Apparently, my AEM wideband O2 sensor is actually a lambda sensor not an Air/Fuel sensor. The output voltage is 0 to 5 volts and it is actually a Lambda value, not an air/fuel value. To calculate the equivalent air fuel ratio, you multiply the lambda by a different constant for each type of fuel. As it turns out, the sweet spot for gasoline air/fuel mixture is about 12 to 1. I've heard that the sweet spot for alcohol air/fuel is somewhere around 7 to 1. These both turn out to be the same (or very close) lambda reading on the Wideband O2 so, with the mix of alcohol and gasoline, I'm still tuning for 2.9 volts. This is equivalent to 12 to 1 A/F for gasoline and also equivalent to 7.3 to 1 A/F for Ethanol. I hope this is a valid theory.
So theoretically, no matter what the proportion of gasoline to alcohol, tuning for a wideband lambda of .82 which is equal to 12 to 1 A/F for gasoline and 7.3 to 1 A/F for Ethanol should yield good results??? If you have any input, please feel free to comment. I'd really like more info on this.
Below is the table from AEM.
Wideband Volts
.........Lambda,
.................Gasoline AFR
..........................Methanol AFR
..................................Ethanol AFR
.........................................Propane
0.000 0.570 8.351 3.688 5.13 8.95
0.156 0.580 8.497 3.753 5.22 9.11
0.312 0.590 8.644 3.817 5.31 9.26
0.468 0.600 8.790 3.882 5.40 9.42
0.624 0.610 8.937 3.947 5.49 9.58
0.780 0.620 9.083 4.011 5.58 9.73
0.936 0.630 9.230 4.076 5.67 9.89
1.092 0.640 9.376 4.141 5.76 10.05
1.248 0.660 9.669 4.270 5.94 10.36
1.404 0.670 9.816 4.335 6.03 10.52
1.560 0.680 9.962 4.400 6.12 10.68
1.716 0.690 10.109 4.464 6.21 10.83
1.872 0.700 10.255 4.529 6.30 10.99
2.028 0.710 10.402 4.594 6.39 11.15
2.184 0.730 10.695 4.723 6.57 11.46
2.340 0.750 10.988 4.853 6.75 11.78
2.496 0.760 11.134 4.917 6.84 11.93
2.652 0.780 11.427 5.047 7.02 12.25
2.908 0.800 11.720 5.176 7.20 12.56
2.964 0.820 12.013 5.305 7.38 12.87
3.120 0.840 12.306 5.435 7.56 13.19
3.276 0.860 12.599 5.564 7.74 13.50
3.432 0.880 12.892 5.694 7.92 13.82
3.588 0.910 13.332 5.888 8.19 14.29
3.744 0.930 13.625 6.017 8.37 14.60
3.900 0.960 14.064 6.211 8.64 15.07
4.056 1.000 14.650 6.470 9.00 15.70
4.212 1.040 15.236 6.729 9.36 16.33
4.368 1.080 15.822 6.988 9.72 16.96
4.524 1.130 16.555 7.311 10.17 17.74
4.680 1.180 17.287 7.635 10.62 18.53
4.836 1.240 18.166 8.023 11.16 19.47
4.992 1.330 19.485 8.605 11.97 20.88
Apparently, my AEM wideband O2 sensor is actually a lambda sensor not an Air/Fuel sensor. The output voltage is 0 to 5 volts and it is actually a Lambda value, not an air/fuel value. To calculate the equivalent air fuel ratio, you multiply the lambda by a different constant for each type of fuel. As it turns out, the sweet spot for gasoline air/fuel mixture is about 12 to 1. I've heard that the sweet spot for alcohol air/fuel is somewhere around 7 to 1. These both turn out to be the same (or very close) lambda reading on the Wideband O2 so, with the mix of alcohol and gasoline, I'm still tuning for 2.9 volts. This is equivalent to 12 to 1 A/F for gasoline and also equivalent to 7.3 to 1 A/F for Ethanol. I hope this is a valid theory.
So theoretically, no matter what the proportion of gasoline to alcohol, tuning for a wideband lambda of .82 which is equal to 12 to 1 A/F for gasoline and 7.3 to 1 A/F for Ethanol should yield good results??? If you have any input, please feel free to comment. I'd really like more info on this.
Below is the table from AEM.
Wideband Volts
.........Lambda,
.................Gasoline AFR
..........................Methanol AFR
..................................Ethanol AFR
.........................................Propane
0.000 0.570 8.351 3.688 5.13 8.95
0.156 0.580 8.497 3.753 5.22 9.11
0.312 0.590 8.644 3.817 5.31 9.26
0.468 0.600 8.790 3.882 5.40 9.42
0.624 0.610 8.937 3.947 5.49 9.58
0.780 0.620 9.083 4.011 5.58 9.73
0.936 0.630 9.230 4.076 5.67 9.89
1.092 0.640 9.376 4.141 5.76 10.05
1.248 0.660 9.669 4.270 5.94 10.36
1.404 0.670 9.816 4.335 6.03 10.52
1.560 0.680 9.962 4.400 6.12 10.68
1.716 0.690 10.109 4.464 6.21 10.83
1.872 0.700 10.255 4.529 6.30 10.99
2.028 0.710 10.402 4.594 6.39 11.15
2.184 0.730 10.695 4.723 6.57 11.46
2.340 0.750 10.988 4.853 6.75 11.78
2.496 0.760 11.134 4.917 6.84 11.93
2.652 0.780 11.427 5.047 7.02 12.25
2.908 0.800 11.720 5.176 7.20 12.56
2.964 0.820 12.013 5.305 7.38 12.87
3.120 0.840 12.306 5.435 7.56 13.19
3.276 0.860 12.599 5.564 7.74 13.50
3.432 0.880 12.892 5.694 7.92 13.82
3.588 0.910 13.332 5.888 8.19 14.29
3.744 0.930 13.625 6.017 8.37 14.60
3.900 0.960 14.064 6.211 8.64 15.07
4.056 1.000 14.650 6.470 9.00 15.70
4.212 1.040 15.236 6.729 9.36 16.33
4.368 1.080 15.822 6.988 9.72 16.96
4.524 1.130 16.555 7.311 10.17 17.74
4.680 1.180 17.287 7.635 10.62 18.53
4.836 1.240 18.166 8.023 11.16 19.47
4.992 1.330 19.485 8.605 11.97 20.88