personally, im not a fan of messing with the maft curve unless you know that is for sure the issue (no maf data etc). i am in favor of using the low inj slope to get fueling in range if this was the only change. Fuel pressure is inferred too. I usually start with fuel pressure first before anything, then any tweaks to inj low slope and usually by then things are within 1-3% pretty much across the board (assuming the rest of the model is ok). SD will and can be used to adjust fueling but ive never tried using fuel trims to do so with a maf setup. the impact on pedal feel sucks when you push the SD to far one way or the other from where it should be.
Injector data is not always cookie cutter. Roush has 3 or 4 variations of the same injectors across the years for example. log PWM and fuel trims on both banks (st and lt). add them up and divide by 2. plot that against the pwm and chart it 1,2,3,4,5 ms etc.. youll usually see the low fuel slope under 2 or 3 ms. this slope is used in a very large portion of normal driving, even at high rpms/airflow. id start with the stock maf curve before making other changes. learned baro will need to settle when using fuel trims to adjust from too.
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