Which fuel pressure regulator should I get??

[ecr33noob]

I have a r33 gts25t with the RB25DET and I was looking to get one that could handle a aftermarket fuel system and can someone tell me why some need to have adapters to install the FPR because I thought it just replaces the OEM part...thanks

P.S. I was planning to get the HKS one but it needs an adapter and I was told that the NISMO one could not be used on an aftermarket system...I am getting the Greddy manifold with HKS fuel rail and 550cc injectors

[Okinawa_BNR34]

most cars with quality tuning in Japan use SARD fuel regulators. I'm running twin walbro 255L/hr HP fuel pumps, SARD fuel regulator, HKS fuel rail, and Sard 700cc fuel injectors.

[Joe]

with only 550's the Nismo one should work fine. anything bigger and i would go SARD or equivalent.

[ecr33noob]

thanks...don't they have diff. types of the SARD regulator...type RJ and standard??where is the best place to get one??

[Carl H]

whats wrong with the nismo regulator?i run one on my rb20 with 720cc injectors and havent had a problem yet...

[Darius]

The only thing I can think is that it will not be able to flow enough fuel back to the fuel tank should the fuel system be upgraded to support six 720 cc injectors. I have a SARD racing FPR and the thing comes with -6AN inlet and outlet fittings. What size return line does the Nismo come with, out of curiousity?

[Carl H]

5/16" hose but technicaly 8mm.i dunno man i havent had a problem with mine and iirc the mines skyline uses a nismo fpr.

[minivan_don]

if your upgrading the injectors (550-660's) and pump (walbro 255), is the stock fpr not sufficient??

[Coolwhip]

if your upgrading the injectors (550-660's) and pump (walbro 255), is the stock fpr not sufficient??

the problem with the stock one is that its not adjustable (to adjust the fuel pressure of course).

Anyways, I have noticed a few high fueled / power nissans using a Nismo FPR.

IDK, but i'm upgrading the rail so no Nismo for me.

[Chaos the Xile]

Yeah I have 720cc on a Nismo Regulator no issues yet...

[ecr33noob]

thanks...don't they have diff. types of the SARD regulator...type RJ and standard??where is the best place to get one??

[Sil240]

Ummm. I dont really think it matters if you upgrade to 550's or 750's.You FPR doesn't care.It's job is to hold pressure up until (X pressure) then after that bleed it off.The only thing would be if you have a Crazy big fuel pump that putting out a lot of pressure and it either can't hold the pressure or it can't bleed the fuel off fast enough.

Check Ebay, I believe I saw a SARD regulator up on there.If you want a US one Aeromotive is good, I have the A1001 or something like that.It's adjustable and Boost sensitive i think on a 1:1 ratio.

[Darius]

Ummm. I dont really think it matters if you upgrade to 550's or 750's.You FPR doesn't care.It's job is to hold pressure up until (X pressure) then after that bleed it off.The only thing would be if you have a Crazy big fuel pump that putting out a lot of pressure and it either can't hold the pressure or it can't bleed the fuel off fast enough.

That is exactly what I was trying to explain.

[gawdzilla]

I have a r33 gts25t with the RB25DET and I was looking to get one that could handle a aftermarket fuel system and can someone tell me why some need to have adapters to install the FPR because I thought it just replaces the OEM part...thanks

P.S. I was planning to get the HKS one but it needs an adapter and I was told that the NISMO one could not be used on an aftermarket system...I am getting the Greddy manifold with HKS fuel rail and 550cc injectors

stick with the stock rail and stock fpr, especially for 550s..

[Sil240]

I didn't read that whole thing but I disagree.The FPR should be changed if you are modifying your motor. 1- When you upgrade the fuel pump, people are complaining about running rich at idle.

2- Keep the correct pressure in the rail for the injectors, with bigger injectorsFor 550's i doubt you'll have to worry about it.

3- You can raise the pressure to get better atomization of the fuel to mix with the air

[StricNyne]

i personally am a massive fan of Sard i think it cost 200ish with a gauge, and u could cheap out and get a fluidfilled gauge from jegs for cheap

[BoostFab]

nismo < sard = aem ....pretty much all of them will work just fine. aeromotive best of all if you plan on running braded feed line

[Coolwhip]

what i read on some descriptions for the SARD FPR's are:

the standard type is for those who want to be able to adjust fuel pressure or are lightly modded.

and the RJ is for those who are producing alot of HP and running large fuel system to support. Due to a larger diaphragm.

The bleeding portion of the FPR's job is correct, and i believe the one major thing that most are looking at is the size of the diaphragm. For when I was looking at the others that was the major thing that changed between models