Thread: RC 750cc injectors duty cycle to high ?

with 4.53v you would be anywhere from 350-365whp. That's pretty good, but with 750cc injectors I don't think you should be at that high of a duty cycle.

Are you sure the injectors are 750cc's? I know RC makes different sizes. Is there a way to confirm they're 750cc?

Yes i buy this injectors straight from rc company and its marked like pl4-750d !
Tryed play today with latency but not getting better .
If i set it like rc says 13v 0.32ms 14v 0.24ms i need to adjust maf load to 4700 to idle fine and then its not good because i hit max maf load and on max load its like 75% duty . Today i setted it to 13 v 0.70ms and 14 0,65ms. maf load 3200 its still hitting so high 85% duty.
Need to go bigger injectors if tuning not helps ?!

the latency is so the ecu knows when to inject the fuel. It wont have an affect on your duty cycle

I think i have solved my duty cycle problem ! Tody i have rewired my Walbro 255 fp because i have measured the voltage with stock wiring and its show me 10.9v at wot. Now it wired direct from battery with relay and pump have 13,9v on . Car works better and duty cycle at WOT is very good 70% and i have a 11 stabile afr at WOT , the fuel pressure also is strong and no droping. So i think that the re-wiring fuel pump helps me alot.