Been thinking of my intermittent leaness problem...
09-19-2003 | 12:19 AM
#1
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From: Lastweek Lane - Watertown, NY
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Been thinking of my intermittent leaness problem...
http://www.ravensblade-impreza.com/m.../fuelrail.html
Haven't actually read it yet, but it sounds exciting.
Haven't actually read it yet, but it sounds exciting.
09-19-2003 | 04:28 PM
#2
Big Baller
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I have part of a ludespeed kit. You just need to bore out the hole a little bit to fit the fpr and get one fitting and you'll be set.
It's easier than pulling off your manifold and cheaper.
It's easier than pulling off your manifold and cheaper.
09-19-2003 | 09:54 PM
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Pr0n King
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http://forums.nasioc.com/forums/show...hreadid=422495
Cliff's Notes: No need, Cuz!
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Cliff's Notes: No need, Cuz!
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09-19-2003 | 10:17 PM
#4
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Richard, the fuel line mod they talk about in the thread you posted is what Pat is talking about doing.
He doesn't want to get bigger aftermarket rails, just make them parallel feed.
He doesn't want to get bigger aftermarket rails, just make them parallel feed.
09-19-2003 | 10:42 PM
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Right. But the point of the mod is that there is "uneven fuel distribution" correct? Well it's provent that the stock rail without mods is good for some serious horsepower.
I'm not debating one mod vs. the other (aftermarket rails vs. stock rail mod) but rather the necessity of any fuel rail mod.
Going parallel shouldn't hurt, but doing a lot of stuff that shouldn't hurt for dubious benefit is work wasted in my book.
I'm more wary of the cooling design than I am the fueling. I'm dropping in a bottle of Water Wetter next chance I get that's for sure!
I still want somebody to flow all the ports on a GDA EJ20 manifold to see if there's equitable flow.
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I'm not debating one mod vs. the other (aftermarket rails vs. stock rail mod) but rather the necessity of any fuel rail mod.
Going parallel shouldn't hurt, but doing a lot of stuff that shouldn't hurt for dubious benefit is work wasted in my book.
I'm more wary of the cooling design than I am the fueling. I'm dropping in a bottle of Water Wetter next chance I get that's for sure!
I still want somebody to flow all the ports on a GDA EJ20 manifold to see if there's equitable flow.
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09-19-2003 | 10:47 PM
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Relevant info:
I think converting the fuel rail feed to parallel is a good idea. But is it worth the hassle? Well, not for me at least... For someone looking to add another project to their "to do list" it's probably a worthwhile endeavor. 
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Even on 400+ whp setups I never change them. Usually they make things worse and uneven mixture is not caused by the fuel rails anyway but rather from the intake manifold and head design. Save your money.
there is absolutely no need to larger than stock fuel rails. period. The leaning out problem is not due to insufficient flow of the factory rails. The diameter of the factory rail is about the same as the fuel line on a V8 carb that would feed an entire 8 cyl engine making over 800 HP. And you think your wrx making 400hp needs more fuel than that for 2 cyls??? Get off the crack.
Larger fuel rails cause more tuning headaches than they fix. They are so much larger than what you actually need that they now create even MORE uneven flow to each injector.
The factory rails flow more than enough fuel, dont waste your money
Larger fuel rails cause more tuning headaches than they fix. They are so much larger than what you actually need that they now create even MORE uneven flow to each injector.
The factory rails flow more than enough fuel, dont waste your money
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09-19-2003 | 11:18 PM
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I asked Cobb about fuel rails,
and they told me even their Conebasher car used stock rails. Still looks like a cheap mod to me.
San
San
09-20-2003 | 12:32 PM
#8
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To me, it's an issue of troubleshooting. There are so many potentials that I seriously need to be careful in which direction to go in fixing it. It might just be an issue of the current tune being deficient.
To be honest, where I have been leaning is in tackling the long term fuel trim. I haven't even researched how to do it, but I've found some very good resources to read.
To be honest, where I have been leaning is in tackling the long term fuel trim. I haven't even researched how to do it, but I've found some very good resources to read.
09-20-2003 | 02:18 PM
#9
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Looking at the Easy Street car in PA over the weekend they are using factory fuel rails with a modified fuel lines delivering fuel to them
Aftermarket fuel rails=NOT NEEDED (we agree)
Parallel fuel lines to the rails= needed.
The modified lines they are talking about on the easystreet wrx IS/ARE the Parallel modification because it's important to get equal fuel pressure and flow to all the injectors.
09-20-2003 | 11:25 PM
#10
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You're right. We ARE talking about different things. 
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