Fuel pressure formula ??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

89s132b · 12-19-2004, 09:56 AM

The SAFC cannot adjust fuel when your ECU is in closed loop (i.e. while idling)
Your O2 sensor feedback will maintain your a/f ratios regardless of your fuel pressure and SAFC setings. But still you don't want to pump it up too much

Rule of thumb is don't run more than 60 psi. It takes 4 times the fuel pressure to double fuel flow so it doesn't help as much as you would think anyways. Raising the pressure to extreme levels is very hard on the pump and can lead to leaks or failures in the plumbing and injectors themselves. Plus it changes your injector latency so they won't be firing at quite the right (optimum) time.

It is much better to buy the right sized injectors.

hope this helps

12-19-2004, 09:56 AM	#12
89s132b Zilvia Member Join Date: Apr 2003 Location: Oklahoma Posts: 220 Trader Rating: (0) Feedback Score: 0 reviews	The SAFC cannot adjust fuel when your ECU is in closed loop (i.e. while idling) Your O2 sensor feedback will maintain your a/f ratios regardless of your fuel pressure and SAFC setings. But still you don't want to pump it up too much Rule of thumb is don't run more than 60 psi. It takes 4 times the fuel pressure to double fuel flow so it doesn't help as much as you would think anyways. Raising the pressure to extreme levels is very hard on the pump and can lead to leaks or failures in the plumbing and injectors themselves. Plus it changes your injector latency so they won't be firing at quite the right (optimum) time. It is much better to buy the right sized injectors. hope this helps