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Old 05-22-2004, 01:46 PM   #1
Unsung Boxer
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Default Svx Fpr

So, I have a WRX fuel pump and EJ22t injectors, 10-12lbs boost, been using stock FPR...

u guys think this is a problem? Should i get an SVX FPR? If so, how much are they?

-Jake
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Old 05-22-2004, 02:02 PM   #2
benjaminetanyahoo
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I'm looking for one too. subaruparts.com has them for 98 bucks for the same part number I got from the dealership, but it might not be exactly for a SVX. Good luck if you find one hook a brother up I need to get rid of this vortech
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Old 05-22-2004, 03:57 PM   #3
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www.car-parts.com -- got mine for $35 off a junk car, and as far as I know, it's still working great for the person that bought it from me.
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Old 05-22-2004, 07:56 PM   #4
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but really how necessary is it? Am i losing fuel pressure, or am i starving my injectors using my current setup:

WRX pump
EJ22t injectors
EJ22 na (stock) FPR
10lbs boost
(emanage)
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Old 05-22-2004, 08:00 PM   #5
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From what I hear if you use a high flow fuel pump like a walbro or what not, the best fuel pressure regulator to get is the svx because the stock one will run rich. That's from Wedge's mouth...
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Old 05-22-2004, 08:06 PM   #6
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so what ur saying is that my FPR cannot hold back my WRX pump?

-Jake
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Old 05-22-2004, 08:46 PM   #7
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That's what I got out of it
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Old 05-22-2004, 09:22 PM   #8
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Just the opposite - your stock FPR is too restrictive. At higher flow rates, the FPR won't let enough fuel through and your line pressure will rise. This is really only a problem at idle/low load, since the injectors are using such a small amount of fuel. All the rest of it needs to pass through the FPR to get back to the fuel tank, and it can't.

FWIW, a friend of mine installed a Walbro pump and his fuel pressure went way up at idle. I happened to have an old FPR off of a 1.8l engine. After some experimentation, we discovered that the old 1.8L FPR worked the same way the SVX one did. My theory is that _all_ the old FPRs worked like the SVX one, and later, Subaru put a stiffer spring in the FPR (or something like that) and this is what caused the problems at high fuel flow rates.

Also, FWIW, I'm running a WRX pump and a stock FPR. No problems, but I've never measured my fuel pressure to see if it's high at idle.

As usual, this went way longer than I intended. Hope you can make sense of it.

_Jeff
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Old 05-23-2004, 01:06 AM   #9
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Not sure about the WRX pump without the regulator, but I think pretty much any WRX FPR should work too. Not sure which direction the vacuum line is leaving it's housing, but it shouldn't be too hard to fit a line to it properly to get it to work.

Also, Porter is correct about the description. I've seen a Walbro idle at 45psi, then when partial throttle is hit, it will actually drop pressure as the injectors are using a decent amount of fuel, then will go back up to around 43-45psi at WOT.
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Old 05-23-2004, 01:45 AM   #10
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I'm using a WRX pump and 280cc injectors on my EJ18T with the stock FPR. At 6 psi and maxing the injectors, my car still seems to run a little too lean. Would a less restrictive FPR be ideal for something like this?

Brent
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Old 05-23-2004, 08:01 AM   #11
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8

It's Portly, not Porter.

scoobyimprza:

A less-restrictive FPR will lower fuel pressure (and lean out a mixture), not raise it. Remember, the FPR creates it's restriction after the fuel has passed the injectors, so the more it restricts, the more pressure the injectors see. In your case, a RRFPR (like the Vortech unit so many turbo kits seem to come with) might be the ticket, as it will raise fuel pressure in proportion to boost, resulting in some extra fuel getting to the injectors. The Cartech FMU/FPR ( http://www.cartech.net/fmu2020.htm ) might work well for you, as it appears to be quite adjustable. However, I have no experience with this unit, so I can't vouch for it's ease of use or reliablity.

And remember, I'm just a Scooby Newbie, so I may not know what I'm talking about.

_Jeff
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Old 05-23-2004, 09:22 AM   #12
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Quote:
Originally posted by Portly
8

It's Portly, not Porter.
Doh! And I was wondering how much Porter knew technically when I was typing that, too.

Agreed with Portly's method stated above. Get a good baseline pressure, then use an RRFPR to raise from there. The restrictive FPR's aren't very consistent with their pressures, so tuning them would be a pain in the arse.
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Old 05-23-2004, 12:26 PM   #13
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Ok from personal experience... I had a "modified" FPR for a while, then I bought a used SVX FPR.. my car ran SSOOOOOOO much better.. just get one they are cheap, and can't hurt anything.
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Old 05-23-2004, 01:53 PM   #14
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im wondering if this would contribute to my extremely rich idle when car is cold

-Jake
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Old 05-23-2004, 02:03 PM   #15
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I'm getting one to see if this will fix my rich idle period... I imagine it would, find a used one for less than 75 or so and have at it, can't hurt ya know
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Old 05-23-2004, 06:18 PM   #16
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do we have confirmation that the old EJ18 one is the same?

-Jake
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Old 05-23-2004, 06:50 PM   #17
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Jake

I don't know of anyone other than my friend who's tried this. It's still working great for him, but the "body of knowledge" is a bit thin on this one. If you can find one for a song, I'd say go for it. Not sure how old you'll have to go, though. I think the one I gave him was off of a '93.

_Jeff
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