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Understanding Injector Data Sheet

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I have upgraded injectors in my truck that I'd like to understand how to tune for. I also have the associated data sheet and am little confused by some of the numbers that I'm seeing. There are parts of the map that show that the fueling is basically identical for my new injectors compared to the stock tune file and other places require less duration for the same amount of fuel as I would expect, but specifically the EM test shows that it would require a longer duration for the same fuel quantity which I don't understand. I will try to post files that will show what I'm talking about.