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Old 03-25-2004, 01:46 AM   #1
Trizzle
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Default 1st run after removing turbo kit... running poorly

2000 2.5RS

Ok, so i blew up my engine and decided to remove the turbo kit and go back to stock, for those of you who didn't know that, which is probably most of you.

I just got everything finished and the car is not running very well. I think it's rich, really rich, like burbly, sputtery, won't pull hard rich. Other than the way it's running, the thing that makes me think this is that i'm still running the high pressure walbro fuel pump and SVX fuel pressure regulator that were used for the turbo kit. Is there a way to make the car run decent without swapping those items out? I don't have the parts (gaskets) right now to swap the fuel pump, and I don't have a normal 2.5RS fuel pres. regulator to swap back in.

Is there anything else i may not be thinking of in the turbo-to-n/a conversion?


Oh, and the reason i posted here and not in NA is because it's turbo-related even though i no longer am running the turbo.


UPDATE: Ok, so i hooked up my fuel pressure guage to the fuel deliver hose and only got about 20 psi. That's not what i was expecting at all. Isn't the system supposed to run around 40 psi stock? That pretty much throws out my theory of high fuel pressure causing a rich condition.
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Last edited by Trizzle; 03-25-2004 at 04:17 AM.
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Old 03-25-2004, 09:19 AM   #2
8Complex

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You're supposed to see about 32-34psi at idle and with the vacuum line disconnected you should see 42-44psi.

Was gonna say, I was pretty sure that even with the Walbro installed, as long as you had the SVX regulator installed you should've been fine.

Are you throwing any codes? I kinda did somewhat of the same, but I'm throwing like 8 CEL's.
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Old 03-25-2004, 10:58 AM   #3
HOK
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Was it the EJ22T that blew? care to share what happened? I've noticed a few now...
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Old 03-25-2004, 12:29 PM   #4
squirrelmasta
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What were you running for fuel management? Link i'm assuming? if so, your ECU might not be thinkin right. again you should throw some codes then. all i can really think of is some how you are getting to much fuel and i would guess you should some how get stock back in there.
-Eli
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Old 03-25-2004, 12:34 PM   #5
Trizzle
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8Complex, I think i am still running the SVX regulator, though to be honest, i'm not sure. I don't know what it looks like/where it is. Which vacuum hose are you talking about removing?

Am i tapping the correct hose to check pressure? I'm using the top one of the 3 metal fuel lines that come from the drivers side of the intake manifold.

Hok, search this forum for "another one bites the dust"

I was running an S-AFC and a RRFPR for management, it was Eric's old car.
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Old 03-25-2004, 12:59 PM   #6
Aphex
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have you tried resetting the ECU?
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Old 03-25-2004, 01:09 PM   #7
Trizzle
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yes
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Old 03-25-2004, 01:31 PM   #8
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sigh...
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Old 03-25-2004, 02:08 PM   #9
Safir
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Quote:
Originally posted by Trizzle
8Complex, I think i am still running the SVX regulator, though to be honest, i'm not sure. I don't know what it looks like/where it is. Which vacuum hose are you talking about removing?

Am i tapping the correct hose to check pressure? I'm using the top one of the 3 metal fuel lines that come from the drivers side of the intake manifold.

Hok, search this forum for "another one bites the dust"

I was running an S-AFC and a RRFPR for management, it was Eric's old car.
tap the line coming from the fuel filter to measure fuel pressure.
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Old 03-25-2004, 02:09 PM   #10
8Complex

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Quote:
Originally posted by Trizzle
8Complex, I think i am still running the SVX regulator, though to be honest, i'm not sure. I don't know what it looks like/where it is. Which vacuum hose are you talking about removing?

Am i tapping the correct hose to check pressure? I'm using the top one of the 3 metal fuel lines that come from the drivers side of the intake manifold.
The FPR should be at the rear passenger side of the motor on the fuel rail. You can't really tell the difference unless you know the orientation difference between it and the standard RS one (the vacuum line is 45 off from a standard RS one, so it's tough even if you do know). The vacuum line that I was talking about was the one attached to this regulator.

Of those three hoses 1 should be smaller, that isn't it, and the other two will be 30+psi and 5-10psi. The 30+ should be the feed line and the other should be the return.
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Old 03-25-2004, 02:20 PM   #11
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Troy, if you need I have stock rs fuel pumps and fprs.
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Old 03-25-2004, 02:51 PM   #12
Trizzle
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Ok, i just got back from some testing. Turns out it was in fact running lean, which makes sense. I used my S-AFC to richen it up and it runs quite nicely now.

I don't understand why my fuel pressure is so low, but it shouldn't be difficult to fix, simply placing a restrictor in the return line should do the trick. That seems like the band aid fix though, addressing the symptom rather than the problem. I'd prefer to find out why the pressure is so low to start with and correct that directly.

8complex, thanks for the description of the FPR, i'll see if i can get a pic of it.

Supapooh, i've got the stock pump, but i don't have the FPR. What is the difference in function between the SVX and the RS regulators? I'm assuming the SVX one allows for higher pressure since it is often used on RS-Ts.
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Old 03-27-2004, 02:00 AM   #13
Eric SS
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swap and N20. gone. : (

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So you know, it is the SVX FPR and the Walbro 255 Fuel pump that was in the car when I sold it to you.
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Old 03-27-2004, 10:36 AM   #14
Trizzle
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Does the FPR go at the end of the metal tube coming off the rear of the passenger side fuel rail about 6"? Cuz what's there right now is some aftermarket adapter that is simply a coupler between the metal fuel tube and the rubber one. It has about a 3/16 hole in it, not a restrictor/regulator at all. I didn't see any feul pres regulator.

I've got some pics but it's hard to see, it's the blue anodized piece in there.



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Old 03-27-2004, 02:06 PM   #15
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Yeah, thats where it would be. Trace that hose and see where it leads to.
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Old 03-28-2004, 11:30 PM   #16
Trizzle
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Default

I'm pretty sure that just runs straight back to the fuel tank. It doesn't appear that i have any fuel pressure regulator at all right now, which explains the very low pressure.

supapooh, i'll probably take yours, i sent you a PM.

Eric, am i missing something here? I don't see the regulator, although I don't know exactly what i'm looking for, so i may be staring at it and not realize, but i don't think so. I think the RRFPR was the only thing taking care of fuel pressure before.
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Old 03-28-2004, 11:57 PM   #17
8Complex

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If you look at this picture, you'll see a stock 2.5RS fuel pressure regulator screwed to the manifold in the same location where you took your pictures. The SVX one is very similar, but the vaccum tube coming out of the diaphragm side (you can see it sticking up towards the throttle body) is rotated 45 from there (I forget if it was more up or more down, though).
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Old 03-30-2004, 03:01 AM   #18
Eric SS
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swap and N20. gone. : (

Default

Not sure what that is. When I sold it to you It didn't have any blue anodized pieces on it. The SVX regulator looks EXACTLY like the stock FPR and I had it where the stock one goes. It looked bone stock with the FPR there. The only thing I can think of is that when the car burned the company you brought it to put that on there... I have never seen that piece before in my life.

EDIT: If you look at 8complex's picture, that is exactly where the SVX FPR was that i had on it. It bolts onto the fuel rail on the passenger side after the fuel injectors using 2 screws and the other side of it (The FPR) is a rubber hose that uses a hose clamp. Coming out of the FPR is a vaccum hose that goes to manifold vacuum. I used a one way valve between the FPR and the maniflod so it would read vaccum but would not read pressure. That way, the FPR would take care of the fuel pressure when the engine was at vaccum but the RRFPR would take care of fuel pressure under boost.

EDIT 2: Again, I reiterate, the vehicle DID NOT have that anodized blue piece there when I sold it to you. It looked just like 8complex's picture and had the stock looking SVX Fuel Pressure Regulator there. Someone added or replaced something there after I sold it to you.

Last edited by Eric SS; 03-30-2004 at 03:15 AM.
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Old 03-30-2004, 03:44 AM   #19
Trizzle
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Ok, i gotcha Eric You seem a little defensive sometimes, i hope you realize that i'm not upset with you about any of this stuff. I don't blame you or anything. You gotta expect this kinda stuff when you buy a car that modified and i knew that.


The blue anodized adapter must have been something Rallitek put in there when they repaired the fire damage and put the OBX brand RRFPR in replacement of the bell type.

Man, i've sure learned a lot in this whole process. Had the engine out, completely disassembled, back together and it runs again. I'm amazed just at that. I even adjusted the valves myself while it was apart, which had always thought was one of the tasks requiring the most technical proficiency. It was a little bit tedious, but pretty easy really. I guess there's nothing really too magic in there. (except for the electrical)
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Old 03-30-2004, 09:43 PM   #20
Eric SS
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swap and N20. gone. : (

Default

Quote:
Originally posted by Trizzle
Ok, i gotcha Eric You seem a little defensive sometimes, i hope you realize that i'm not upset with you about any of this stuff. I don't blame you or anything. You gotta expect this kinda stuff when you buy a car that modified and i knew that.
Oops... I didn't mean to sound defensive. I did not take offense or think you were attacking me. I was just 100% positive that I didn't put that there and wanted to make that clear so you know that someone else did that in case a shop you brought it to was trying to screw you or something.
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Old 03-30-2004, 11:17 PM   #21
Trizzle
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Ah, ok. I have a hard enough time interpreting subtleties and picking up on things in real life conversation... on the internet, i'm totally socially inept
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