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Fuel system upgrade?BLOWN25TH 01-29-2003, 03:53 PM I have a 12psi 355 TPI w/200cc pro1 heads, blower cam and free flowing exhaust. Currenlty i have ATI's fuel pump along with 24lb injectors. Can i get away with these injectors with a custom chip or do i need larger ones. ? I know dyntuning will tell me but i am trying to find out before i put it together and start burning chips and money. Suggestions would be helpful. Thanks IDOXLR8 01-30-2003, 09:21 AM Are you still running an FMU? WHat is your injector duty cycle?? From your setup it seems like you should be running 42 lb injectors. :) I would eliminate the ATI inline pump and install an Walbro 340 intank. BLOWN25TH 01-30-2003, 09:43 AM I dont really know the duty cycle of my injectors are. I dont know the formula. Yes i do have a FMU. Ben383 01-30-2003, 01:59 PM As what was stated earlier by IDOXLR8 , I would say 42lb injectors would be right for you . Ben IDOXLR8 01-30-2003, 03:05 PM Originally posted by BLOWN25TH I dont really know the duty cycle of my injectors are. I dont know the formula. Yes i do have a FMU. What do you use to scan your car?? Ideally you want to be around 80% duty cycle. If you are over that many people tend to raise the fuel pressure to lower the injector duty cycle. BLOWN25TH 01-30-2003, 03:13 PM The dyno will be my scan tool. Would i still have to use the FMU if i went with 42lb injectors? 94SLUG 01-30-2003, 03:27 PM Do you have stock pump? I have a 255 with 42s i(no FMU) have only spun to 4k due to a new motor, but i think i will be ok. Tell you in a 1000miles:rolleyes: | ||