text: Who has replaced their stock FPR and with what? - NASIOC
  Who has replaced their stock FPR and with what?
  09-28-2001, 12:53 PM #1
  I know some people have replaced the stock fuel pressure regulator with SVX ones with good success, but has anyone replaced it with an aftermarket one with no problems?
  If anyone has experience swapping out the stock FPR for a different one please post here and let me know what you are using and if it allowed you to drop the idle fuel pressure back down to normal.
  I need to get my idle fuel pressure back down to normal levels.
  09-28-2001, 03:05 PM #2
  I thought you were running the Vortech Super FMU? Isn't that adjustable so that you can set the idle fuel pressure? That was the whole reason why I bought it. I am curious now to what problems you are having with it?
  09-28-2001, 04:00 PM #3
  the vortech FMU is "transparent" under vacuum. if there is no boost, it wont add any fuel pressure. The stock FPR on the RS only works under vacuum (more fuel pressure as vacuum decreases).
  You put the together and it's "all good".
  The FMU should be on the return line, after the stock FPR.
  Do a search, I posted on this already Being a moderator you should know better
  EDIT: And because i hate people that say that, I did it for you
  http://www.i-club.com/forums/showthr...&highlight=FPR
  If you check out that first link to summit racing, all of them have an extra inlet, but you can just order a AN plug and plug it up and it will work of you.
  09-28-2001, 04:59 PM #5
  I already have a Vortech SFMU that is ramping up the fuel pressure 5:1 under boost.
  I suppose that I could only use the Vortech SFMU and bypass the stock FPR. Has anyone gotten rid of the stock unit and relied only on an aftermarket RRFPR (or FMU as vortech calles em )?
  I saw that post but it never really says what you ended up doing. What did you do and did it work? Are you only running one FPR or do you have a RRFPR and FPR? That post needs more info to be helpful
  09-28-2001, 05:46 PM #6
  I am going to try the Vortech Super FMU this weekend with NO stock FPR. It should work fine from what the instructions say. I'll let you know how it comes out.
  As for the vacuum issue, well I guess I will figure something out.
  09-28-2001, 05:54 PM #7
  How did I fix my problem?...I never did so I ended up buying a Tec-2....BUT! email this guy:
  http://www.i-club.com/forums/member....fo&userid=7190
  I talked with him about my problem and he told me what to do He knows ALOT on fuel setup stuff. I just didn't have any money to spend on fixing this, other wise I would have.
  EDIT: Oh yea one more thing I learned, never say FPR on this board, alway say Fuel Pressure Regulator, too many people think you talking about a fuel pressure riser
  09-28-2001, 06:10 PM #8
  In checking out the stock fuel pressure regulator I noticed that the side that feeds the fuel rails would need to be amputated in order to bypass it as it screws into a little flange it appears. the other side would work no problem if you just got some longer fuel line.
  It should definately by "do-able" with the vortech SFMU, but you would need to be willing to hack off the end of metal line that has the flange, so you could fit a fuel line over it.
  I will check it out a bit more in a little while...
  Lets keep eachother posted so both of us don't find out it doesn't work and are left screwed
  09-28-2001, 10:03 PM #9
  /me whispers "Get the used SVX one... it's cheaper and works great!"
  09-28-2001, 10:27 PM #10
  I have already done a Fuel Line Conversion and cut one piece of metal so don't go cutting anything yet and I will let you know how it works sometime this weekend with out the Stock Fuel Pressure Regulator
  09-28-2001, 10:53 PM #11
  Its actually not that easy to get one 8, I tried...hit up a bunch of the on-line places that had wrecked SVX's, even with the picture I sent them, they still couldn't even find it
  09-29-2001, 01:43 AM #12
  Does anybody have instructions for installing the Vortech SFMU (the 6:1 non-adjustable one)? Also, do I need any fittings? what size? I didn't look at the links, if it's on there just say which ones.
  09-29-2001, 02:25 AM #13
  http://www.scoobymods.com/mods/impreza/sfmu.php
  09-29-2001, 02:59 AM #14
  Legacy GTR ,
  The mod doesn't say this but you will need to get an adaptor for the fuel lines, so that you can attach the fuel lines ot the SFMU. The flared bolts that come with it are way to big and a converter to a barbed fitting of 5/16ths will do just perfect.
  In any case I am trying it tomorrow without the stock Fuel Pressure Regulator.
  09-29-2001, 03:55 AM #15
  I'm surprised Skywalker didn't mention it, but I've been running a Weapon-R FPR only, for months. But I also had already done the fuel line mod prior. Skywalker liked it enough that we did it to his
  Anyways, my current settings are: 28psi @ Idle, 40psi off boost, 50psi @ 10lbs. I recently discovered it acts as a 1:1. Keep in mind that I'm running 370cc injectors, which were tested to 398cc @ 43psi.
  I could be off by a couple psi, but that's what I remember as of now
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