3 bar fuel pressure regulator
#12
TECH Addict
Thread Starter
iTrader: (10)
Join Date: Nov 2005
Location: Way out there
Posts: 2,199
Likes: 0
Received 0 Likes
on
0 Posts
I don't know much about the spray pattern, if you can maintain a 3 bar differential between fuel rail pressure and manifold pressure that will at least make tuning easier (If the pressure drops you will have to compensate in the tune). If I am trying to maintain a 4 bar differential my fuel pressure is going to be close to 75psi, I would imagine the fuel pump wouldn't last as long that way. The main reason I would want to do this is so I can get by without using a huge, expensive aftermarket inline that may not be as reliable.
#15
14 Second Truck Club
iTrader: (3)
Join Date: Aug 2007
Location: Kansas
Posts: 295
Likes: 0
Received 0 Likes
on
0 Posts
On a side note, if a FPR is "going bad" and my running fuel pressure is 50psi versus the spec of 55psi minimum what will be the side effects....a lean code possibly? or some powere loss and no code? I'm not trying to jack the thread but I was under the impression that the injectors need to see a steady 55psi+ while running.
#16
2nd fastest 5.3 ECSB
iTrader: (14)
Yes, because your IFR is tuned that way. The PCM doesn't know how much fuel or at what pressure it's being injected, it has to be set in the program so if your pressure is dropping and the settings are the same then you are supplying less fuel to your injectors than required.
#18
TECH Fanatic
iTrader: (1)
You're on the right track. There was some recent discussion on this topic that might be helpful: https://www.performancetrucks.net/fo...d.php?t=427224
#20
High on diesel fumes
iTrader: (70)
Dropped the fuel pressure to somewhere around 43-44 psi. The pitch of the pump increased quite a bit. My 96# injectors were rated 96 lb/hr at 3 bar, so I had them in the tune as about 110 lb/hr to match the 4 bar fuel pressure. I just turned the pressure down, changed the IFR table back to 96 lb/hr, and everything worked fine without having to tweak any of the airflow tables at all. Very simple At 5600 RPM and 10psi I'm still only seeing 51% IDC max, lol.