whats the stock fuel pressure for a :

b16
b18
b20
h22

 

bump

 

bump, i need to know this also

 

bum

 

also interested as well

 

I am interested also, I will update when/if I find it.

 

heres what i know......if a b16 FP is 30psi and u have a catback system that adds 10% more air flow, you new FP should be 40psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLUE EH3 &raquo;</TD></TR><TR><TD CLASS="quote">heres what i know......if a b16 FP is 30psi and u have a catback system that adds 10% more air flow, you new FP should be 40psi</TD></TR></TABLE>

Umm I don't think so. So if I turbo my car and add 400 times more air then fuel pressure should be at 430 psi?

ANYWAY...I'm pretty sure the stock b16 pressure is 42.

Just set it to around 40-45 and reset the ECU. If I'm not mistaken it doesn't matter really, the ECU will figure it out when you reset it. It only makes a difference if you adjust the fuel pressure and don't reset the ECU

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLUE EH3 &raquo;</TD></TR><TR><TD CLASS="quote">heres what i know......if a b16 FP is 30psi and u have a catback system that adds 10% more air flow, you new FP should be 40psi</TD></TR></TABLE>

You need to try harder than that. How do you know it flows 10% more air? Is that in the intake or exhaust? You know fuel flow does not increase linearly with pressure, right?

Oh, and:

» Search Results

Your search for stock fuel pressure returned 136 results.

Your answers are out there, I've posted them before.

 

This is from All-data. All stock fuel pressures.

99-00 Civic Si
--vaccum line hooked--31-38 psi
--vaccum unhooked -- 40-47 psi

Del Sol Vtec
--hooked--31-38
--unhooked--40-47

95 Civic Ex
--hooked--31-38psi
--unhooked--40-47psi

94-95 GSR
--hooked--39-46psi
--unhooked--48-55psi

96-00 GSR
--hooked--38-46psi
--unhooked--47-55psi

90-92 Integra LS
--hooked--36 psi
--unhooked--41-48psi

Integra Type R 00
--hooked--38-46psi
--unhooked--47-55 psi

92-93 GSR
--hooked--39-46psi
--unhooked--48-50 psi

This is at a idle, this is for a idea. I don't know how accurate this is, because they don't even have a 99 Civic Si in the book, its wierd. And I looked up ecu codes, the 95 Del Sol VTEC had a p30a, when the 94 Delsol vtec had a P28. I think there are some spec errors..

Hopefully this is helpful.

Jarrod.

 

Good info.

BTW THe Del Sol VTEC had a P30 .

The P28 is for the Del Sol Si with the D16z6

I should know, I have a del sol vtec swap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by _gurusan_ &raquo;</TD></TR><TR><TD CLASS="quote">Good info.

BTW THe Del Sol VTEC had a P30 .

The P28 is for the Del Sol Si with the D16z6

I should know, I have a del sol vtec swap. </TD></TR></TABLE> Thank you. I know, but in the alldata, it says it has a p28 in the 94s in the DOHC Vtec models. O well.

I'll try to submit my part.

 

un/hooked ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLUE EH3 &raquo;</TD></TR><TR><TD CLASS="quote">un/hooked ?</TD></TR></TABLE>

As in...not hooked up to where it was hooked up. There is a vacuum line that goes from the intake manifold to the FPR - if you unhook it, it will cause fuel pressure to increase. When you unhook it, you must also plug this line so as to not cause an increase in idle speed.

Now, when I say 'plug', you can simply pinch the line.

Hopefully you also realize you will pull the vacuum hose off of the FPR and not the intake manifold and plug the open end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">

As in...not hooked up to where it was hooked up. There is a vacuum line that goes from the intake manifold to the FPR - if you unhook it, it will cause fuel pressure to increase. When you unhook it, you must also plug this line so as to not cause an increase in idle speed.

Now, when I say 'plug', you can simply pinch the line.

Hopefully you also realize you will pull the vacuum hose off of the FPR and not the intake manifold and plug the open end.</TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote"> Thank you.

As in...not hooked up to where it was hooked up. There is a vacuum line that goes from the intake manifold to the FPR - if you unhook it, it will cause fuel pressure to increase. When you unhook it, you must also plug this line so as to not cause an increase in idle speed.

Now, when I say 'plug', you can simply pinch the line.

Hopefully you also realize you will pull the vacuum hose off of the FPR and not the intake manifold and plug the open end.</TD></TR></TABLE>

 

WHat idle speed is this at?


My car idles around 700-800

 

why would u unhook it?

 

When the fuel injector sprays, it does so into a manifold that may be under a vacuum or it may be under the pressure of the atomsphere (or turbo/super). And so to maintain a constant fuel pressure across the injector, a vacuum referenced FPR is used.

Sooo....when you nail the gas, atomspheric pressure is present in the manifold and thus present at the tip of the injector pushing back against the fuel which is trying to come out - so we need to increase the fuel pressure to account for this. Think of the case for a turbo - you use a 1:1 FPR - you boost 12psi and fuel pressure goes up 12psi but the pressure differential across the injector has stayed the same.

When you unhook that vacuum line, you are allowing the FPR nipple to see atomspheric pressure and increase fuel pressure accordingly. So you unhook it to check for this 'loaded' condition.

 

Well said Chris.