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

dRift_g0ddess · 10-14-2009, 07:55 PM

hey so im running a ka24de with intake.. catback exhaust, and im preping for my turbo set up so i put in the stock sr 370cc injectors and a walbro255.. and i just put in a adjustable fuel pressure regulator.. i know stock psi would be 43.5.. but i have to run it at about 32 for it to run correctly.. any reason why this would be? is it normal? do i need to put something else for it to run correctly untill i get the whole turbo thing done?

any input is greatly appriciated

thanks!!

japslapsilvia · 10-14-2009, 08:02 PM

what are u using to tune for difference in injector size?

RunninMeBrokeS13 · 10-15-2009, 12:55 PM

34psi is the correct fuel pressure under vacuum and 43psi is without vacuum your fine. thats what it should be at.

dRift_g0ddess · 10-18-2009, 09:32 PM

im not running anything to tune it yet.. lol jwt is on its way for when i get the turbo on. what u mean under vacuum? o_O

ericb382 · 10-18-2009, 11:37 PM

You are running larger injectors without tuning for them.... YOU WILL RUN RICH. If you lower your fuel pressure this will "help" compensate. Put your stock injectors back on and go back to stock fuel pressure. Put on your injectors at the same time as your ecu compensating for your injectors...

10-14-2009, 07:55 PM	#1
dRift_g0ddess Join Date: Feb 2009 Location: SoCa Age: 21 Posts: 39 Trader Rating: (1)	Fuel pressure.. hey so im running a ka24de with intake.. catback exhaust, and im preping for my turbo set up so i put in the stock sr 370cc injectors and a walbro255.. and i just put in a adjustable fuel pressure regulator.. i know stock psi would be 43.5.. but i have to run it at about 32 for it to run correctly.. any reason why this would be? is it normal? do i need to put something else for it to run correctly untill i get the whole turbo thing done? any input is greatly appriciated thanks!! __________________ ~GirLs drift too ~

10-18-2009, 09:32 PM	#4
dRift_g0ddess Join Date: Feb 2009 Location: SoCa Age: 21 Posts: 39 Trader Rating: (1)	im not running anything to tune it yet.. lol jwt is on its way for when i get the turbo on. what u mean under vacuum? o_O __________________ ~GirLs drift too ~

10-18-2009, 11:37 PM	#5
ericb382 Zilvia Member Join Date: Oct 2005 Location: Flagstaff, Az Posts: 212 Trader Rating: (4)	You are running larger injectors without tuning for them.... YOU WILL RUN RICH. If you lower your fuel pressure this will "help" compensate. Put your stock injectors back on and go back to stock fuel pressure. Put on your injectors at the same time as your ecu compensating for your injectors... Last edited by ericb382; 10-19-2009 at 08:16 AM.

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10-15-2009, 12:55 PM	#3
RunninMeBrokeS13 Join Date: Aug 2009 Location: Central New Jersey Posts: 11 Trader Rating: (0)	34psi is the correct fuel pressure under vacuum and 43psi is without vacuum your fine. thats what it should be at.