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

 

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.

 

I dont really know the duty cycle of my injectors are. I dont know the formula. Yes i do have a FMU.

 

As what was stated earlier by IDOXLR8 , I would say 42lb injectors would be right for you .

Ben

 

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.

 

The dyno will be my scan tool. Would i still have to use the FMU if i went with 42lb injectors?

 

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