Ideal Fuel Pressure Regulator setting - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jacobzking · 02-21-2012, 02:27 PM

I looked at just about all the FPR links and couldn't find an answer. I also read that Tomei has a calculator on their site but I couldn't find it. So anyone wanna take a stab at how to set a Tomei rising rate FPR for:

sr20det
walboro 255
555cc injectors

Thanks!

ultimateirving · 02-21-2012, 03:48 PM

43.5psi at idle. With vacuum connected 36psi without

jacobzking · 02-21-2012, 04:18 PM

Quote:

Originally Posted by ultimateirving

43.5psi at idle. With vacuum connected 36psi without

isn't that the stock setting for the smaller fuel pump?

cotbu · 02-21-2012, 06:14 PM

First of all, are you tuned for those 555cc injectors?
Second there's is no second if you not tuned for those 555's!

Quote:

Originally Posted by ultimateirving

43.5psi at idle. With vacuum connected 36psi without

This is you answer otherwise!

jacobzking · 02-24-2012, 12:10 PM

yes, I'm tuned for the 555s. so my question is... isn't 43.5 the ideal pressure for the stock setup? if i'm running a different pump, and different injectors wouldn't i want to change the fuel pressure. isn't that the point of an adjustable fpr?

GroundPerformance · 02-24-2012, 01:28 PM

Quote:

Originally Posted by ultimateirving

43.5psi at idle. With vacuum connected 36psi without

You sir got it backwards... If you have an adjustable FPR. You will need to take off the vac hose from the fpr and dial it to 43.5 (3bar) and then attach the vac hose back. Depending on the condition of the motor not all will have the same vacumm so dont worry about that.

GroundPerformance · 02-24-2012, 01:34 PM

Quote:

Originally Posted by jacobzking

yes, I'm tuned for the 555s. so my question is... isn't 43.5 the ideal pressure for the stock setup? if i'm running a different pump, and different injectors wouldn't i want to change the fuel pressure. isn't that the point of an adjustable fpr?

To best honest with you. If your running 555cc injectors and you its tuned for it. I really dont see the need for an adjustable FPR. Adjusting pressure will alter your tune and will not do you that much good at all. Only reason I would run one is if your maxing out those injectors and would want to get a little more fuel but this should be done during tuning. If you have a stock turbo running on baby boost you can spend that money elsewhere it actually counts.

LiveLowSilvia · 02-21-2013, 01:24 PM

Quote:

Originally Posted by GroundPerformance

I really dont see the need for an adjustable FPR. Adjusting pressure will alter your tune and will not do you that much good at all. Only reason I would run one is if your maxing out those injectors and would want to get a little more fuel but this should be done during tuning. If you have a stock turbo running on baby boost you can spend that money elsewhere it actually counts.

So would it be necessary to even have a FPR if I'm running a standalone system that's waiting to be tuned?? With 880cc injectors...
If I have total control with the AEM EMS, I shouldnt need an FPR, correct?

CurleyMerkin14 · 02-21-2013, 02:20 PM

Quote:

Originally Posted by LiveLowSilvia

So would it be necessary to even have a FPR if I'm running a standalone system that's waiting to be tuned?? With 880cc injectors...
If I have total control with the AEM EMS, I shouldnt need an FPR, correct?

those are large injectors idk what your running that needs them but...if your running lean on those injectors and they are maxed out electronicaly then an adjustable FPR would be added to produce more pressure in the system to give you the required fuel for your application ... that's kinda the simplest i can explain that

96Turbo · 02-21-2013, 03:06 PM

adjustable FPR is good. set it to stock like these guys suggested.

however, i don't think you need a rising rate FPR. you should use a regular FPR, and handle all the fueling control with your ecu.

coupesallday! · 05-01-2020, 10:48 AM

Bump. I have the same upgrades as the OP, was wondering if a aftermarket FPR is necessary or not

mechanicalmoron · 05-01-2020, 11:16 AM

Thank you for the bump, this thread is fucking priceless.

02-21-2012, 02:27 PM	#1
jacobzking Zilvia Member Join Date: Nov 2011 Location: Frisco, TX Age: 40 Posts: 288 Trader Rating: (3) Feedback Score: 3 reviews	Ideal Fuel Pressure Regulator setting I looked at just about all the FPR links and couldn't find an answer. I also read that Tomei has a calculator on their site but I couldn't find it. So anyone wanna take a stab at how to set a Tomei rising rate FPR for: sr20det walboro 255 555cc injectors Thanks!

02-21-2012, 03:48 PM	#2
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	43.5psi at idle. With vacuum connected 36psi without __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

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02-24-2012, 12:10 PM	#5
jacobzking Zilvia Member Join Date: Nov 2011 Location: Frisco, TX Age: 40 Posts: 288 Trader Rating: (3) Feedback Score: 3 reviews	yes, I'm tuned for the 555s. so my question is... isn't 43.5 the ideal pressure for the stock setup? if i'm running a different pump, and different injectors wouldn't i want to change the fuel pressure. isn't that the point of an adjustable fpr?

02-21-2013, 03:06 PM	#10
96Turbo Zilvia FREAK! Join Date: Nov 2007 Location: AZ Age: 32 Posts: 1,315 Trader Rating: (11) Feedback Score: 11 reviews	adjustable FPR is good. set it to stock like these guys suggested. however, i don't think you need a rising rate FPR. you should use a regular FPR, and handle all the fueling control with your ecu.

05-01-2020, 11:16 AM	#12
mechanicalmoron Zilvia FREAK! Join Date: Jul 2013 Location: tx Posts: 1,073 Trader Rating: (0) Feedback Score: 0 reviews	Thank you for the bump, this thread is fucking priceless.