I'll add too - when I swapped to Bosch D III injectors , just 32 lbs, I found that I had to just zero out the pulsewidth adder (not batt. voltage offset), because the Bosch injectors are the other way. I was told they flow more fuel at low PW, and with LT1 you can't take away only add, which is the wrong way. So it depends on which injectors you use as to what all you change in the tune. FIC was absolutely no help on this, even though I bought the injectors through them. They had the data somewhat tailored for the LS1 crowd.
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