100% duty cycle means that the injector is spraying continuously, it never shuts off, even for an instant. I can't imagine that that should happen for longer than a fraction of an instant. It would flood the engine.
Be thankful you guys have Mopars- probably better fuel mgmt. On some Gov't Motors cars, opening up the intake and exhaust will lead to 100% duty cycle 'cause they're fuel mgmt. is already on the hairy edge.
Time on/( time on+ time off) * 100 Its a simple time count that doesent take any revulotions into countat all. lets say that you run at 2000 rpm´s and have a duty cycle of 50% and then yourun the engine at 4000 rpm´s with the same amount air passing at each revolution you will end up at 100%, so the faster you spin the bigger injector will needed. In the 2 mopars ive tried e-85 in ive seen that for a unmodified engine there was enough capacity to tolerate the 30% increase in fuel flow...didnt even lit the lamp.
Apparently duty cycle is a percentage of 1 complete power cycle (2 crank rotations). I know what my cam duration is and I don't want to create a CIS system. Matching injectors and fuel pump to get duty cycle I can live with.
Yeah, duty-cycle is the on-time (spray) compared to the off-time of the injector. Some scan tools measure the injector on-time in milliseconds (ms). General on-time at idle is 2-3 ms and as the rpm or load goes up, the injector on-time increases also.
Domestic Chryslers use the speed/density EFI type system.