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Old 09-26-2004, 12:13 PM   #1
GregBolby
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Default So is a MY98 rs fpr the same as an SVX fpr?

the reason i ask is that i canot find an svx fpr so i have read a few post stating that the parts are the same

Thanks

Greg
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Old 09-26-2004, 06:09 PM   #2
IowaRS
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Let me qualify this answer with the assumption that you want to use this FPR in a situation where you've upgraded your fuel pump and the current FPR is causing too high of fuel pressure at idle.

In this case, in my experience, and based on my assumption, it would appear that many of the 1998 and earlier FPR's work like the SVX one does.

I am currently using one from a 1.8L subaru motor. I think it's 1997??
Regardless, we (Portly and I) believe that any 1998 or earlier should work better than 2000+ for added fuel capacity caused by a high flow fuel pump.
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Old 09-26-2004, 10:48 PM   #3
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Yes it is the same. You can verify it with part numbers on subaruparts.com or call your local dealer. It was a while ago but I cross referrenced part numbers and most of the 98 and older motors used the same part number.

Greg, I got your pm as well. I have to dig through my spare parts and see if i still have it. I'll pm you back and let you know.
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Old 09-26-2004, 11:58 PM   #4
Unsung Boxer
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is the L also the same? 98 L?

-Jake
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Old 09-27-2004, 09:39 PM   #5
GregBolby
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thanks Mancini
let me know


Greg
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Old 09-27-2004, 10:35 PM   #6
darioc
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what is the advantage of using the older fpr's? what do they do that the newer ones do not?
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Old 09-27-2004, 11:36 PM   #7
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Quote:
Originally Posted by darioc
what is the advantage of using the older fpr's? what do they do that the newer ones do not?
I think the svx has a higher fuel pressure. I think stock we run like 36 while the svx runs 52?
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Old 09-28-2004, 03:30 PM   #8
darioc
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why is that better though? why would you want to run crazy rich all the time? or would you be running rich at all?
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Old 09-28-2004, 06:48 PM   #9
GregBolby
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yes you would be running rich, very, like me my cruise and idle fuel pressure is around 52psi, my gas mileage sucks and also my idle is a bit rough, on cold mornings my car is hard to start and i know for a fact this is because of the high fuel pressure...

Greg
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Old 09-28-2004, 09:18 PM   #10
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Quote:
Originally Posted by darioc
why is that better though? why would you want to run crazy rich all the time? or would you be running rich at all?
Yea, I am not sure with subies but anything over 600cc/min injectors on a nissan need a higher FPR. And injectors ratings change for how much pressure is on them, not sure if that is true for all injectors but it make sense.
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Old 09-29-2004, 02:09 PM   #11
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all subaru fpr's will throw the same amount of fuel psi as boost psi into the engine. that is how they all work. do you need 4 psi of fuel for every 1 psi of boost?
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Old 09-29-2004, 03:48 PM   #12
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Quote:
Originally Posted by subiekid
I think the svx has a higher fuel pressure. I think stock we run like 36 while the svx runs 52?
No, the difference is that they have more capacity to bypass fuel. When you install a high-flow fuel pump, the stock FPR can't bypass enough fuel, so the pressure at idle skyrockets. The SVX (and also apparently early-model Impreza) FPRs have more fuel-bypass capacity, so they continue to work normally with high-flow fuel pumps.

Quote:
Originally Posted by IowaRS
I am currently using one from a 1.8L subaru motor. I think it's 1997??
Actually, I believe the motor was a '93. Dunno if that matters, though. My '97 2.2, combined with a stock FPR, seemed to run high pressures with a WRX fuel pump, but I never installed a Fuel Pressure gauge to verify that - I just hacked a second stock FPR into the line to give me more bypass capacity.

_Jeff
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Old 09-29-2004, 04:49 PM   #13
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so i should get an older fpr off an impreza or svx if i get a high flow fuel pump on my 02 rs? i dont have any management.
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Old 09-29-2004, 06:44 PM   #14
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Quote:
Originally Posted by darioc
so i should get an older fpr off an impreza or svx if i get a high flow fuel pump on my 02 rs? i dont have any management.
Management really isn't the issue. If you get a high-flow pump you'll _probably_ see high fuel pressures at idle. If you have a FP gauge, that will tell you whether you have a problem. So, if you have a gauge, I'd hold tight until you got the pump in to see if it causes you problems.

Off topic, but curious - why would you want a high-flow pump on an unmanaged car? W/o some timing and fuel management, there's no remotely safe way to be running any boost and w/o boost, what do you need a high-flow pump for? Building for the future?

_Jeff
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Old 09-29-2004, 08:09 PM   #15
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thats not true. my friend has a turbo legacy with a tdo4 turned down to about 5 psi, run mechanically, and he has had no problems. the setup was acutually on an older L before that too! the guy who put the thing together is a master subaru tech who has worked with them for 26 years. the guy is crazy. i could listen to him talk all day! regardless, it has been done and im doing it as we speak. im putting the td04 on with an hks downpipe, fitted to my car with the turbo higher up in the engine bay than normal, and a custome uppipe. along with a voltage clamp for the map sensor, a valve check for the charcoal canister, and my coolant and oil lines. i am going to see how it runs and then go from there. i also have twe stage 2 heads and cams so it should be pretty fun.
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Old 09-29-2004, 08:53 PM   #16
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Quote:
Originally Posted by darioc
thats not true. my friend has a turbo legacy with a tdo4 turned down to about 5 psi, run mechanically, and he has had no problems. >snip<
Best of luck to you. My friend (IowaRS, who posted earlier in this thread) is running 4.5 psi of boost on an '00 RS, with a J&S Safeguard and a Cartech RRFPR, and a properly-sized turbo, instead of the undersized td04. Even with the timing retard and extra fuel, the J&S still detects light knock occasionally. If you're running a stock-internal '02 2.5, with no timing retard and no extra fuel, you may not be able to hear the knock, but it'll definitely be there. Enjoy the extra power, and start looking around for deals on used engines.

_Jeff (starting the countdown to yet another "Blew My Engine!" thread)
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Old 09-30-2004, 12:56 AM   #17
subiekid
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Quote:
Originally Posted by darioc
thats not true. my friend has a turbo legacy with a tdo4 turned down to about 5 psi, run mechanically, and he has had no problems. the setup was acutually on an older L before that too! the guy who put the thing together is a master subaru tech who has worked with them for 26 years. the guy is crazy. i could listen to him talk all day! regardless, it has been done and im doing it as we speak. im putting the td04 on with an hks downpipe, fitted to my car with the turbo higher up in the engine bay than normal, and a custome uppipe. along with a voltage clamp for the map sensor, a valve check for the charcoal canister, and my coolant and oil lines. i am going to see how it runs and then go from there. i also have twe stage 2 heads and cams so it should be pretty fun.

que?

you took an ej22T which could take way more boost and turned it down? So you put a new WG spring on the TD 04? I dont understand
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Old 09-30-2004, 08:12 AM   #18
Portly
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Quote:
Originally Posted by subiekid
que?

you took an ej22T which could take way more boost and turned it down? So you put a new WG spring on the TD 04? I dont understand
He says "turbo legacy", which may just mean a normal legacy, with a turbo added. If it's the "EJ22T", then there's no question as to why it "worked with no engine management". Even a "normal" engine on an older legacy would be running considerably lower compression than the poster's '02 RS engine, and I believe the older engines were also built a bit heavier/tougher. So it's still conceivable that 5 psi could be made to work on a n/a engine w/o management. But on one of the new engines, the experience of others indicates that this route is a quick way to a broken engine.

_Jeff
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Old 09-30-2004, 08:50 PM   #19
darioc
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it was a newer 2.5 dohc engine. we'll see!! haha!!
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