Jump to content
SAU Community

Recommended Posts

Hey forum need your help again I have a fuel pressure regulator on the way and I wanted to know what pressure to set it at to get the most out of the stock injectors. I have a stock turbo as well running 10 psi, what pressure do I set the fuel at to get the most out of the injectors and if I was to turn up the boost to 13 do I then turn down the fuel pressure to compensate for turnin up the boost? Thanks in advance.

Link to comment
https://www.sau.com.au/forums/topic/179547-fuel-pressure-regulator/
Share on other sites

Just set it to "factory" fuel pressure, then leave it alone.
So that would be around 44psi and even if I up the boost just leave it at that? There is no need to up the fuel pressure? So what is the advantage of having a fuel pressure regulator I thought you would use it to up the fuel pressure a bit in order to gain horsepower and maximize injector usage.

The FPR takes a signal from the manifold so that it maintains a fixed pressure above the manifold. So if you up the boost, the FPR will add sufficient extra fuel, based on the manifold pressure (= boost).

Adjusting the pressure is a useful alternative to fitting bigger injectors. BUT, you need to re-tune the ECU, because upping the pressure will enrich the mixture, and these engines run rich enough as it is without adding extra fuel.

The FPR takes a signal from the manifold so that it maintains a fixed pressure above the manifold. So if you up the boost, the FPR will add sufficient extra fuel, based on the manifold pressure (= boost).

Adjusting the pressure is a useful alternative to fitting bigger injectors. BUT, you need to re-tune the ECU, because upping the pressure will enrich the mixture, and these engines run rich enough as it is without adding extra fuel.

So if I am keeping the stock injectors just setting the fpr to stock fuel pressure will give a slight increase in horsepower and the stock injectors will be used to their potential?

So if I am keeping the stock injectors just setting the fpr to stock fuel pressure will give a slight increase in horsepower and the stock injectors will be used to their potential?

AN aftermarket FPR wont be of any benefit unless you raise the pressure, but its not necessary unless you plan on making more than 220rwkw. Even then you need management. The only exception in a rising rate reg, but even then you will need management first

AN aftermarket FPR wont be of any benefit unless you raise the pressure, but its not necessary unless you plan on making more than 220rwkw. Even then you need management. The only exception in a rising rate reg, but even then you will need management first

Ok here is the story. I really don't plan on making more than 220rwkw in my car, from what I read in the forum thats the safest route to go with my current mods and I dont plan on changing injectors Its virtually stock except fmic, cold air filter with pod, 3.5" turbo back, 255 lph fuel pump, stock turbo boosted up to 10 psi and afc neo. I just want to maximize the stock injectors to get the most flow out of them. So I wanted to now if an aftermarket fpr would benefit any or help me in any way to get the most out of my stock injectors.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I've got a 2011 J50 that I imported six years ago. The unmodified factory AV system date and time has always been correct ( Japanese timezone of course ) up until last month. About two weeks ago, at engine start, the system wished me a happy new year ( in Japanese of course ). I can't think of anything that would make the system think that the date had changed, unless the GPS component has failed/reset somehow ? I checked the GPS reception in the system settings, and it can still see the satellites. Has any other J50 owner had this happen ?  It's no biggie, just annoying that it tells me the wrong date anytime I start the engine. 😅
    • Love following your adventures on IG, hopefully if you're still around in Japan when we visit again wouldn't mind going for a few beers with you (that's if you're keen on hearing how I hate Nissans).
    • ok so if i wanted to go 18's i would go for 8's  in front 30+ or 32+ off set at front and the back 9 would be ok? what offset should i aim for.. then can i do some  hunting for wheel rim choices..    If i get this - will this fit all around: Size: 18 x 8.5 +37 - n what tyres size tyre should i get for front n back?  
    • Absolute f*cking nightmare. I had to take breaks constantly, and I was always pissed off when I got home. The line split in Italy on day 2 (we drove from the Netherlands), lol. Driving any narrow European town was... well, sh*t.   Appreciate it man. Here, I'll just drop a favourite from the load I took on Saturday.   I'll update here when things happen with the car, the thing is, with stock power and almost everything chassis-wise taken care of, there really are no problems. 268,000kms now and counting.  
    • Ah! I actually managed to snag a lightly used set.... that aren't so suitable for me right now. They don't work on a GTT without some cutting or creative heat moulding. I thought about reselling them myself cause I didn't want to murder them, but it looks like I'm probably going to attempt to murder them/melt them because I may as well. @GTSBoy @PranK can somebody close this thread?
×
×
  • Create New...