Edelbrock Pro-Tuner, Руководство пользователя

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A stoichiometric ratio is 14.7:1. If you have your preferences set to display in
equivalence ratio, 1.0 is a stoichiometric ratio. Generally, high performance engines will
run best at that ratio or less (richer). At idle and light load, the AFR can usually be at or
near 14.0-14.8. As the load goes up, the ratio must be richen-ed (lowered) for best
power and possibly to avoid detonation limits. At Wide Open Throttle (WOT) ratios as rich
as 12-12.8:1 are not uncommon. If you are working in equivalence ratio, you would
increase the number to richen and decrease the number to lean.
As with the spark map, start conservatively (slightly rich), and start out at light load &
low speed - optimizing the map as you go up in speed and load. Use as much
instrumentation as available to help you generate an optimized map that does not
jeopardize reliability. Try to keep the map fairly "flat" around the idle cells to help with a
smooth idle. Use the MotoBall to track where you are running. You can see from the main
display the current target AFR. This may not agree exactly with your map value because
you may actually be running between cells, where the ECM interpolates or calculates a
target value between the mapped values. Keep this in mind as you tune all of the maps.
Below is a chart comparing mixture values for gasoline. Note that Lambda is similar to
equivalence ratio, but works opposite:
Equiv Ratio Lambda Gasoline
AFR
1.458 0.686 10.08
1.437 0.696 10.23
1.416 0.706 10.38
1.397 0.716 10.53
1.376 0.727 10.69
1.353 0.739 10.86
1.333 0.75 11.03
1.312 0.762 11.2
1.292 0.774 11.38
1.271 0.787 11.57
1.250 0.8 11.76
1.229 0.814 11.96
1.208 0.828 12.17
1.188 0.842 12.38
1.167 0.857 12.6
1.145 0.873 12.83
1.125 0.889 13.07
1.105 0.905 13.31
1.083 0.923 13.57
1.063 0.941 13.84
1.042 0.96 14.11
1.020 0.98 14.4
1.000 1 14.7
0.964 1.037 15.25
0.928 1.078 15.84
0.892 1.121 16.48
0.855 1.169 17.18
0.820 1.22 17.93
0.784 1.276 18.76
0.748 1.337 19.66