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When they about the duty cycle, if they say the duty cycle is at 100%, that means your injector is maxed out and will not flow any more fuel other than what it is at. At this point , you can do two things to correct this 1-raise the fuel pressure to compensate 2- put a bigger set of injectors in. But just remember, if you do one or the other you better make sure the fuel delivery system can keep up. I work alot with the after market EFI systems like F.A.S.T. and Big stuff 3 . when I do a tuneup on a motor I dont try to let the duty cycle get past 90% , because now the tuning window is limited and also if the injector is maxed and its runs into a lean condition it has no extra fuel for correction.
Hopefully this helps
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