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The two lookup tables serve as reference points for the ECU based on the user selected octane slider. As an example, if air mass at 3000 rpm is 600 mg/stroke and the low table shows 5.250 and the high table shows 13.875 the ECU will then look at the octane slider value and interpolate timing. Keeping the stock settings of 87 low and 100 high there are 14 different timing values that could be used. The delta between low and high for our example is 13.875-5.25=8.625. 8.625/14=0.62. For every increase in 1 above 87 on the octane slider the ECU will attempt to run approximately 0.62 degrees timing above the value in the low table. If you set the slider to 99 (13/14 available positions) then the timing will be 13*0.62=8.06 added to 5.25=13.31 (Maestro only allows values as multiples of 0.375 so in actuality the timing would be 13.125...close enough).
→Timing
As with any table within Maestro, the X and Y values can be modified to suit the users needs, however the Air Mass and RPM values as set on the base files should satisfy 99.99% of users and are not recommended to be modified.
'''Setting a Timing Curve'''
