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Fitting A Fuel Pressure Regulator

Mr GTS4

By Mr GTS4,
in Engines & Forced Induction

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Oblivion Grand Master

Oblivion

Posted
Posted

i remember on my r32 i cleaned it out once, but it was not part of the rail...on the r33 i am not sure. installing one though, just remove the old one and put in the new, if it is electronic then i wouldnt try it, i would be replacing all the efi full line while i did it too, to make sure that nothing happens. as for placement, dont make it too far away, prob on the firewall. to tune it you will need a dyno prob, or trial and error. The original fuel reg is located inbetween the plenum and the tapper cover i think.

Trust33 Grand Master

Trust33

Posted
Posted

you need to know what pressure to run the adj fpr.

that means find out what pressure d stocko runs.From there u might want to run the adj item at the same if it hasnt been causeing probs.then run it down to your tuner.it will help to have a fuel pressure gauge to read pressure.

does any 1 know how much of an adverse affect bumping up the rail pressure will have to afr's?

predator Grand Master

predator

Posted
Posted

Er.. what brand?

With the Nismo, undo two bolts, undo the hose.. fit the new one in it's place, tighten. Done!

The base rate needs to be set however, and mine was 10psi off. I took it easy for a week though.

I doubt the lines will burst if you up the fuel pressure, as long as they're not really really old.

lwboosted Rising Star

lwboosted

Posted
Posted (edited)

if you dont get a reg that bolts into the end of the rail like a malpassi, sard, etc. u will need to make up an adaptor to replace the old reg: like in this pic of mine post-24129-1147594191.jpg

then if u have a malpassi (like mine) u run the the fuel line fom the adaptor into the side of the reg. then the line goes from the bottom of the reg back to the fuel tank. post-24129-1147594379.jpg

the fuel line that does not have the fuel filter on it is the return line to the tank.

standard fuel pressure is 38psi on idle..

hope thats what u were after.

for some reasons the picks aint workin"???

Edited by lwboosted
muniom Apprentice

muniom

Posted
Posted

hey guys, installed a sard FPR myself on the weekend but havnt been able to find anywhere with a cheapy fuel pressure gauge that i can tap into the fuel line with, adjust the FPR to 38psi, and be happy :\.

Anyone know where i can get a gauge??? I dont want a wanky in-car gauge or anthing, just something that can sit in the engine bay somewhere.

lwboosted Rising Star

lwboosted

Posted
Posted

nah u dont leave the stock one there.

look in the first pick i put up.. i got a dodgy second hand reg from a wreckers for like $20 and cut the top of it off then welded a small pipe on the top of the plate to connect the fuel line too...

if you keep the stadard fuel reg on it will hold the same pressure and all the aftermaket reg will do is raise the pressure in the fuel line back to the standard reg... so it makes it pointless....

my malpassi didnt come with a guage either so i just bought a $25 one from auto barn which screws straight into the side of the reg.

CATKICKER Mentor

CATKICKER

Posted
Posted (edited)

do you need one on stock injectors?

I am about to install R32 GTR injectors on my R32 and I have the GTR fuel rail and regulator (not sure if it is different than the stock RB20 regulator but I guess so)...

Edited by CATKICKER
rob82 Mentor

rob82

Posted
Posted
nah u dont leave the stock one there.

look in the first pick i put up.. i got a dodgy second hand reg from a wreckers for like $20 and cut the top of it off then welded a small pipe on the top of the plate to connect the fuel line too...

if you keep the stadard fuel reg on it will hold the same pressure and all the aftermaket reg will do is raise the pressure in the fuel line back to the standard reg... so it makes it pointless....

my malpassi didnt come with a guage either so i just bought a $25 one from auto barn which screws straight into the side of the reg.

Ahh no it doesn't. If the second reg has more base pressure than the first reg it will force the diaphram up a little so that the total rail pressure is equal to the higher pressure regulator. So if you leave you standard FPR on which has a base pressure of about 38 psi with no vacumm and you put you shitty malpassi on after the standard FPR and raise the pressure to 50psi the total rail pressure is 50 psi. The trick is to leave the standard reg on as it has a metal diaphram and does a good job of controlling pressure unlike the malpassi. THe standard reg will also maintain rail pressure after the car has stopped whereas the malpassi will bleed off.

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