How much can stock injectors handle? 7 psi? 8 psi? Also, can RC 310cc injectors (the ones that came with the Si kit) handle 10 psi?

 

bump

 

I ran mine at 7 psi with stock injectors, stock fuel pressure, stock timing, and a Walbro 255 pump. No pinging or anything and it ran great. I would think with the blue box and 310cc injectors you would be able to run 10 psi, maybe have to delay the timing a touch. I just ditched the blue box yesterday and I'm running the afc hack now at 10 psi and lovin it.

 

Thank you! Finally an answer from someone who's actually run that setup. That's exactly how I've been planning to run mine, stock injectors w/ a 255lph pump at stock timing. Should I get my fuel injectors cleaned and tested, or do you think they'll be okay as is? Also, I have a B&M commandflo FPR, and it's set at 41psi at idle, what should it be set at when the greddy kit goes on?

 

I know that the blue box will support up to 7psi with 310 injectors and a good deal of retarded timing but after that you run out of fuel. 310's and 10psi is not a good idea. The pulse width of the injector becomes too high. Hell, at 15psi my 440's are at 77%... yikes.

 

I ran the greddy kit on my d16y8 for awile. I ran it @ 8psi for alittle while on stock injectors, timing, and a 255lph intank pump. The motor held strong and when i swapped i gave it up. The other guy said the motor ran strong for him.