Fuel pressure for LTFT (fast intentions stage 1)

FrostZ34 · 10-08-2019, 06:30 PM

So, I’ve been having issues with my car running lean for a while now, and I’ve checked everything I could think of until I got to fuel pressure. My install procedure for the FAST 500 fuel return system tells me to set the regulator to 44 psi while the engine is running. I know stock is around 54, so I bumped it up just to test it out and my LTFT went from +32 to +10. Should I try and bump it up again to adjust fuel trim? After I bumped it up the first time, the car ran smoother than it has in a long time.

soill370z · 10-09-2019, 10:51 AM

I would set the fuel pressure to 52 psi with engine running no vacuum line to the regulator, once you plug in the vacuum hose to the regulator it should drop to around 45 ish good luck!

10-08-2019, 06:30 PM	#1 (permalink)
FrostZ34 Base Member Join Date: Oct 2015 Location: Summerville, SC Posts: 14 Drives: 2014 370z silver 6mt Rep Power: 10	Fuel pressure for LTFT (fast intentions stage 1) So, I’ve been having issues with my car running lean for a while now, and I’ve checked everything I could think of until I got to fuel pressure. My install procedure for the FAST 500 fuel return system tells me to set the regulator to 44 psi while the engine is running. I know stock is around 54, so I bumped it up just to test it out and my LTFT went from +32 to +10. Should I try and bump it up again to adjust fuel trim? After I bumped it up the first time, the car ran smoother than it has in a long time.

10-09-2019, 10:51 AM	#2 (permalink)
soill370z Base Member Join Date: Mar 2015 Location: illinois Posts: 134 Drives: 13 nismo 370z Rep Power: 10	I would set the fuel pressure to 52 psi with engine running no vacuum line to the regulator, once you plug in the vacuum hose to the regulator it should drop to around 45 ish good luck! wideglideleon likes this.

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