Hey guys I need a little bit of help for a starting point at where to adjust the fuel pressure down to. The car was running the V2 kit with a 3.125 pulley, walbro 255gph pump, sard fpr, vortech fmu (8:1 disk i believe) and 370cc injectors. That fuel pressure was ~40 at idle. I have had to remove the supercharger for a short time because I am doing work on another motor, and need to get this fuel pressure down lower for a relativley stock maxima aside from exhaust and intake mods. It's running way too rich, and I am not sure how low to go anymore considering everything has been upgraded. Last night I set it to 30psi but its still quite rich- I dont have a wideband either. So what would be a good fuel pressure to set it to?

 

Stock A32 fuel pressure is ~2.4 bar (34 psi), but the stock injectors are 260cc@3bar. Honestly I have no idea how you would tackle those fuel pressure calculations with 370's...


EDIT: I suck at life in general, but according to some random (most likely incorrect) injector flow/calculation site:

'Old fuel pressure: 40
New fuel pressure: 20

At your new pressure, your 370 injectors will flow 261'

Try setting the fuel pressure down to 20psi? That would set them to flow about the same as stock 4th gen injectors.

Like I said, I have no idea what I'm talking about, so wait for someone else to post on here first, that's just what I found in a quick google.

 

I was trying to find some sort of conversion/calculator for that but wasnt able to find one. 20ish psi sounds about right considering the flow difference. Its running pretty rough at 30, just didnt want to go too lean.

 

Stock fuel pressure is 3 bar (43psi) at 0 vacuum. It is ~34psi at idle vacuum.

 

22psi ended up working but I feel thats pretty low pressure for injectors and that they dont have a good spray pattern. So I either am going to put the stock injectors back in or put the blower back on...tough choice!