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doublins said:
Yup. That is how piggybacks work- they modify the fuel map by taking MAF/TPS inputs and modifying the maf voltage to the ecu, when the car is in open loop, the result is that you can pretty much run whatever a/f you want if you determine the appropriate false maf sensor voltage to feed the ECU at a given rpm/maf/tps voltage.

Now do it for a bunch of points, and put it in tabular format. If you like, add a supplementary map sensor so you can continue to get readings if your maf sensor is capping out at 5V. Bam! You've just created the greddy emanage, S-afc, etc.
with all these tech contributes.. why don't you have dots? Here.. you deserve some..
 
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