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Old 07-14-2008, 10:34 PM   #26
STIBungy
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If you follow the fuel flow in the diagram posted by bad noodle, you'll see that fuel enters and exits 1 rail before entering the other rail. By going with a parallel fuel configuration, both rails would get fuel at the same time.

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Just have to ask...but what would be the point/advantage of doing this?
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Old 07-15-2008, 01:34 PM   #27
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Quote:
Originally Posted by cellgeek101 View Post
Just have to ask...but what would be the point/advantage of doing this?

If you re-read the second paragraph in the orrigional post,...I explain there the 2 reasons one might want to do this.

There is no concrete evidence that either is necessary,...but various people believe or have done tests to find that there are problems with the stock system after 350 or so wheel hp.

Too many feet of small ID tubing for the fuel to flow through,..pressure starts dropping near the end (cylinder 3). etc.

So being that I was shooting for 350 - 400 wheel hp (on a Mustang dyno), and being that it was only $35, and I would have the intake off anyway,....I went ahead and did it.
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Old 07-15-2008, 01:44 PM   #28
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nice write-up...wish i would have saw this before i reconnected everything for my reverse intake manifold setup. not taking it apart again haha. i was wondering though if i could just replace it simply with hoses, but didnt feel like messing with it. the hard lines are so annoying when your trying to do a reverse i/m.

just to throw it out there, im at 380/388 on a 30r and dont have upgraded fuel rails. i plan on going back with meth and my tuner told me it was necessary to upgrade em.
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Old 07-15-2008, 03:20 PM   #29
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Interesting setup, reminds me of TBI.
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Old 09-16-2008, 07:08 AM   #30
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What is everyone doing with that 3rd line.Can it vent to atmospere ? Also can the switch at the front of the intake manifold that this runs to be eliminated ?
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Old 09-21-2008, 04:41 PM   #31
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gj ....
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Old 09-21-2008, 04:58 PM   #32
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Quote:
Originally Posted by JTPerryR1 View Post
What is everyone doing with that 3rd line.Can it vent to atmospere ? Also can the switch at the front of the intake manifold that this runs to be eliminated ?


no, do not vent it to atmosphere. follow the way it is routed, and route it the same way. if you follow that line, it runs into the line with the blue connector in it.
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Old 09-21-2008, 10:54 PM   #33
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Quote:
Originally Posted by xxscaxx View Post
no, do not vent it to atmosphere. follow the way it is routed, and route it the same way. if you follow that line, it runs into the line with the blue connector in it.
+1 on that

and ive done this mod my self as well its not that hard

mind you only had my hands no help and it only took me 12 hours
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Old 09-22-2008, 01:17 AM   #34
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^lol ouch!


luckily i've taken my manifold/harness/fuel lines off about 50 billion times, so im pretty quick at pulling things off. also since i reversed my I/M my fuel lines/harness isnt connected to the manifold anymore. all i had to do was unbolt my i/m and i can change out everything without even taking off the tgvs or fuel lines

im going to do this mod tomorrow.
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Old 12-27-2008, 01:30 PM   #35
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thanks for the wright up, I'm doing this along with a few other small projects. any other pics would be great, but not really needed
I'll post up mine as soon as I'm all done, thanks again for the pics and how-to

Justin/vtboost
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Old 04-05-2009, 08:15 AM   #36
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Damn 07 STi has the WRX rails where the FPR is welded to the rail (I am sure the 08+ does as well). And I even got good goodyear fuel line. Oh well, excuse to buy aftermarket rails.
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Old 04-05-2009, 08:39 AM   #37
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I have the APS rails on my car and what that showed me...is how good the factory routing is. I wouldn't change this unless there was a real need. In my case, I was installing the APS inlet tube and had to move FPR anyway.
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Old 04-05-2009, 09:57 AM   #38
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WRX/STi/LGT Rails have been shown to provide at least 500whp. The first restriction would be the lines. Only get aftermarket rails if you have to relocate something, switching injector style, or are going really, really big.
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Old 04-06-2009, 09:00 AM   #39
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I have '05 sti and was fallowing these pics/instructions. I think the driver side rail gets fed from the back and the passenger side rail gets fed from the front. If this way is correct then it matches the pic of the modded supply and return lines with the tees in them. Can anyone verify?
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Old 04-06-2009, 12:23 PM   #40
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Quote:
Originally Posted by DuckStu View Post
And there's no reason the intake and TGV's have to go on together. In stock form they do because the fuel crossover lines bolt to the bottom of the intake and because the lines poke out through the drivers side of the intake,...and it takes some doing to get them in our out. But once you eliminate those metal lines,..the manifold can go on seperately. This is SUPER nice for doing a metal 3" turbo inlet. You can get everything sorted,..then just drop the intake on top.
Thanks for pointing that out... I'm planning to put on a 3" inlet this summer and I'm going to do this while I'm at it.
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Old 04-06-2009, 02:05 PM   #41
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Update: Was trying to make a track date, but ran into major issues installing the APS inlet with my gs x-over and nvidia up-pipe (the turbo was turned towards the left (looking at the front of the car) compared to my wife's (tess) 06 STi with stock manifold/up. I had to take the turbo off, etc for it to fit and put the hose onto the turbo and inlet before mounting the turbo. Broke an up-pipe stud and I still have tons of work to do. Since I bought the Ts and the goodyear FI hose already, I ended up purchasing two of these (alternatively you could just get an 04-06 STi FPR) to relocate the stock FPR off of the rail.

Will update with pics of install that would be applicable to 06+WRX and 07+ turbo subies (since they are all topfeed now).

http://cgi.ebay.com/ebaymotors/SUBAR...spagenameZWDVW



Gabe
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Old 04-07-2009, 08:47 AM   #42
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Looks like you only need one.



The FPR will relocate with hoses. The adapter will fit into the rail.
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Old 04-07-2009, 10:11 AM   #43
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Couple things:

Guys with APS fuel lines, take a look at the FAQ, there was a problem with the APS rubber lines (not the S/S ones), make sure you don't thave the make/model number described there.

I have delta dash. It logs Fuel learning #1 and Fuel learning #3. I believe at this time that it means cylinders 1 and 3.
The first clue is that there are separate features on the fuel side for these. The second clue is that the values differ, even at my modest power level.
So, yes, fuel equalization is most likely needed and not at the "500 whp level".

I don't like setups with many hoses though. Did you see how many of the factory small hoses leak after a while with the cold fuel leak TSB?
And those are really high quality, expensive fuel injection hoses that you'll have a hard time finding at the parts store. I've relaced mines the second time already and researched the make/model number of those hoses.

So then what to do? Somehow reroute using the stock metal lines, I think that would be the ticket. I would also use the fuel vapor metal line for fuelling and reroute the fuel vapors in a rubber hose.
Well, I'm only thinking about it, you guys made it happen, so I can't say that I have an alternative.
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Old 04-07-2009, 10:46 AM   #44
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AFL3 is from the rear O2. That is why you do not want to completely remove it.

Autozone carries goodyear FI hose. I'll be re-using as much of the stock hard lines as possible and possibly buy some more hard lines if I feel the area would get "pinched".
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Old 04-07-2009, 11:21 AM   #45
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Vlad, what FAQ? I've tried to contact APS and got no response.
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Old 04-07-2009, 11:33 AM   #46
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MK, you already know about this, I've posted in that tread about the inlet.
I've posted this in the Inlet FAQ, that's what I am talking about

http://forums.nasioc.com/forums/show....php?t=1681753

About APS, here's what happened to me. I needed info about the TGV Delete couplings, how to install them. APS doesn't have it anymore on their site and the dealers although they want to help, it's ultimately APS that has to help.
So, I picked up the phone (I only have a cell phone) and called APS in Australia.
Then I received an e-mail later with instructions.
If you want to invest in a call, that may help..
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Old 04-12-2009, 12:16 AM   #47
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Ok here are some pics. Still waiting on the fuel rail adapter. I will mark them up, however this is suprisinglingly easy on the new age setup. Less hose is needed and you can prolly do it with the manifold on.

Gabe










Last edited by gabedude; 04-12-2009 at 01:17 AM.
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Old 04-12-2009, 12:32 AM   #48
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holy shuge pictures. shrink those down gabe
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Old 04-12-2009, 12:32 AM   #49
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sweet jesus those are big pictures.
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Old 04-12-2009, 01:26 AM   #50
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Fixed.
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