Stock fuel Pressure Setting

[whiplash willy]

What is the stock pressure setting for the fuel pressure regulator in PSI? This is on a completely stock SR running stock boost. I need to set my adj FPR to compensate for my walbro fuel pump.

[Silverbullet]

it should be around reading 60psi with the Walbro on OEM FPR. It needs to be around 45psi. This is during idle of course. Most people dont even bother with turning it down.

[whiplash willy]

I have been doing alot of searching and seen people say it should be anywhere from 30-45psi. This seems like a pretty large range to me. I have a completely stock 98 s13 blacktop with a walbro 255. I am kind of stressing out because I am driving it daily and am worried about running too rich and damaging my engine.

Also, I have heard of 3 different ways to adjust it, what is the best?

1. Adjust it during idle2. Jumper the fuel pump relay, and turn on the ignition so the fuel pump stays on. Adjust fuel pressure.3. Pull the vac hose from the fuel pressure regulator and adjust during idle.

Thanks

[S13FASTBACKSR]

start the engine pull the vac hose and adjust it to 43.5psi then put the vac hose back on and it will sit about 40

[Blown240sx]

unless your running stupid rich you wont hurt the motor.

[homeslicej2]

So running a Walbro on the stock FPR will be okay?

[DrifterProdigy85]

You can run the Walbro on stock FPR but your fuel pressure will be really high and can cause some studdering when going larger injectors. Just so everyones straight. Fuel Pressure without vacuum should be 43.5psi and once the vacuum is connected itll drop to 37psi.

[whiplash willy]

With my stock FPR I am running 36psi at idle and 46psi when I disconnect the vaccume line from the FPR.

[DrifterProdigy85]

Spend the money on a Nismo. For $125 it really releaves alot of problems and doubt. Get a Wideband or Dyno and see what your AFR is. If its in the 11's then your fine with the stock FPR. But youll still have to upgrade it at some point.

[whiplash willy]

With my stock FPR I am running 36psi at idle and 46psi when I disconnect the vaccume line from the FPR.

[kamikazestorm420]

stock fpr and stock fuel pump.

43psi with vacuum off and 37psi with

[homeslicej2]

I will only be running stock boost, so will I have issues with my AFR running too lean/rich with the Walbro and stock FRP? I don't plan on upgrades bc this will be a daily for at least another year.

[S13FASTBACKSR]

you should be fine IMO

[whiplash willy]

Shouldn't there be a 10psi difference between idle and when the vaccume hose is removed? I wish there was a definitive answer on what the PSI should be for idle and w/o vaccume. I have talked to 10 different people and received 10 different answers. I can't find this anywhere in the FSM.

[S13FASTBACKSR]

well if you ask me its going to differ between stock fpr's because of things such as there quality and the engine even though they are all sr20's because of their condition and the slight differences there could be in there vaccuums

[roamaver]

Sorry to bring up a dead topic guys but I'm doing research on fuel pressure and dont know how to adjust fuel pressure on a stock s13 sr20 fpr?? can anyone set me straight?

[S13FASTBACKSR]

a stock fpr is non-adjustable..you must buy an aftermarket adjustable fpr and make sure you buy a gauge with it so you know what you have adjusted your fuel pressure to

[tx240s14]

i have a sr20det with rom tune walbro pump, 264 cams, what pressure should i have the fuel pressure regulater at?

[PyR0NiAk]

At least you searched... 43.5psi without vacuum hooked up to the FPR at idle. Of course, once it's set... Hook the vacuum back up..

[OM3GA]

^^100%