Installing a Walbro - Do I Need an FPR?

[4felix20]

i've been searching around and it's just getting me more confused.

i'm aiming for 350 hp and i'm running a super 60 T3. I do need a better FPR to handle the walbro pump, right?

[nissanfanatic]

nope. Not unless the stocker is malfunctioning.

[4felix20]

great.i don't need an FMU...do i?

[Nismo_Freak]

No, I would suggest a better FPR though. You will have high idle fuel pressure with the greater flow pump.

[Red-KAT]

I would upgrade also. mine was holding me back at only 8psi.

[turbo98_240sx]

what are the choices besides the nismo FPR?

[240DRFT]

i think boost designs carrys a fpr too

[89porkchop]

i use to run an aeromotive rising rate fpr-

[Red-KAT]

i use to run an aeromotive rising rate fpr-

I run an Aeromotive 1:1 rate... Good for like 800hp of flow.

[WDRacing]

Any adjustable inline FPR will work and can be used inconjunction with the stock unit to increase fuel pressure.

If your running to rich then you'll have to settle for a direct rail bolt on.

[Nismo_Freak]

Any adjustable inline FPR will work and can be used inconjunction with the stock unit to increase fuel pressure.

If your running to rich then you'll have to settle for a direct rail bolt on.

An inline FPR will do nothing for the fuel pressure if you are talking about the feed line. On the return line you can only raise the fuel pressure as the stock FPR will open at ~34 psi at idle.

It would be a waste of time and money to set up the FPR in this manner. It's best to just remove the stock unit and replace it with either an AN (better suited for Aeromotive FPRs) or a barb fitting.

[WDRacing]

An inline FPR will do nothing for the fuel pressure if you are talking about the feed line. On the return line you can only raise the fuel pressure as the stock FPR will open at ~34 psi at idle.

It would be a waste of time and money to set up the FPR in this manner. It's best to just remove the stock unit and replace it with either an AN (better suited for Aeromotive FPRs) or a barb fitting.

Dude...reread what I posted. You simply reworded it ...I said you have to use a direct rail bolt on to decrease your fuel pressure and I said you can use it inline, meaning between the rail and the tank on the return side since everyone knows the reg goes on the return side. And it's only good for increasing the fuel pressure.

So it's not a waste of time...Increasing your fuel pressure is a great way to get more WHP out of whatever injectors your currently running.

[Nismo_Freak]

Dude...reread what I posted. You simply reworded it ...I said you have to use a direct rail bolt on to decrease your fuel pressure and I said you can use it inline, meaning between the rail and the tank on the return side since everyone knows the reg goes on the return side. And it's only good for increasing the fuel pressure.

So it's not a waste of time...Increasing your fuel pressure is a great way to get more WHP out of whatever injectors your currently running.

Ah well I get what you were saying now.

I was understanding inline as in installing it on the feed line, which I think we both agree would be a retarded thing to do.

FPR's have the side benefit of lowering your idle pressure cause the crappy stock one can't flow anything. Plus they look trick and idiots always tend to ask "what is that"

[240SicknessX]

No, I would suggest a better FPR though. You will have high idle fuel pressure with the greater flow pump.

now if you have an ecu tune for 370cc injectors w\ base pressure of 43.5 (vac line dissconnected). Then you install a higher flowing fuel pump (walbro 255 or z32). would the fuel pressure increase throw the whole tune rich all the time or only when the ecu is in closed loop? based off the o2 in open loop, the ecu would be able to adjust how much fuel the injectors put in even though the fuel pressure is higher.

ive seen 16 psi increase of base fuel pressure with a stock fpr and a walbro255 pump.

[Nismo_Freak]

now if you have an ecu tune for 370cc injectors w\ base pressure of 43.5 (vac line dissconnected). Then you install a higher flowing fuel pump (walbro 255 or z32). would the fuel pressure increase throw the whole tune rich all the time or only when the ecu is in closed loop? based off the o2 in open loop, the ecu would be able to adjust how much fuel the injectors put in even though the fuel pressure is higher.

ive seen 16 psi increase of base fuel pressure with a stock fpr and a walbro255 pump.

Just avoid the whole situation and get a proper FPR.

[1WheelWonder]

How hard is to install a fpr inline and does anyone have a good recomendation for a fpr?

[89porkchop]

How hard is to install a fpr inline and does anyone have a good recomendation for a fpr?

aeromotive 1:1

[240SicknessX]

Just avoid the whole situation and get a proper FPR.

i was going to do that anyways, i was just wanting to know.