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I have an injector fueltech 240 lb/hrs how to know which master fuel is best for it?
If you already have the engine tuned on other injectors and all you are changing is the injectors, then you can adjust the master fuel value based on the change in injector flow rate. For example if you swapped from 120 lb/hr to 240 lb/hr injectors which flow twice as much, the reference pulsewidth becomes half as long, so you can cut the master fuel number in half.
If you're asking about coming up with a master fuel number for the first time on an engine you've not tuned, there are many factors.
HPA has a webinar with a little info here:
https://www.hpacademy.com/previous-webinars/011-master-injector-pulsewidth-fuel-table-resolution/
But the Link G4 Plus course has more detail:
https://www.hpacademy.com/dashboard/courses/link-g4-plus-software-tutorial/fuel-setup-master-fuel/
