chief455

iTrader: (21)

Siemens high impedence 60#
seem to be running out of fuel during 10lb boost at 43psi base fuel pressure.
how high can I raise fuel pressure before I'm just plain out of injector?

No tuning software here - just wanting to try more fuel pressue - asking what might happen.

Next question will be - is 72# at 43.5psi base the next right injector to try?

thanks

Atomic

iTrader: (37)

I ran these at the factory 58psi rail pressure without a problem.

Is your FP regulator boost referenced?

chief455

iTrader: (21)

yes, boost reference regulator. I'm seeing ~50psi on my fuel gauge and the car goes flat - pressure holds, car won't rev higher.

Can I safely raise my base to say 48psi just to see if my fp during boost raises and/or the car get's more umph up top? just as a test..

Atomic

iTrader: (37)

I wouldnt suggest it. It will idle terrible and all your trims will be off. Do you have any logging software (hptuners, efilive, etc.). You need to log injector duty cycle to see if that really is your story. I pushed those same injectors well past 500rwhp on a heavy *** truck...

deatschwerks

iTrader: (2)

If you have the ability to adjust the fuel curves, you can certainly run a higher base pressure.

Most injectors can handle 80+psi total system pressure, so bumping your base up to 50psi and seeing 60psi in boost should be well within what the injector can handle.

Also, keep in mind the other part of your fuel system, the fuel pump. Injectors and pumps have an inverse relationship when dealing with pressure. Injectors flow more at higher pressures and fuel pumps flow less. ...and vise-versa.

If you don't have the ability to adjust your fuel trims/curves, raising the fuel pressure will have an adverse affect on your idle and drivability outside of full boost and WOT.

chief455

iTrader: (21)

very clear, thank you! I am working with a tuner to evaluate now.