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Old 04-08-2009, 11:53 PM   #1
williaty
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Default The RS and Injectors/Fuel Rails, Etc.

OK, so I'm outta gas

I know WRX injectors are a direct drop in for my 05 RS. My question is, if I drop in WRX injectors, are WRX fuel rails, FPRs, and parallel conversion setups direct fit as well?
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Old 04-09-2009, 11:50 AM   #2
Whiteghost 2.5
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what are you doing that requires WRX injectors?
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Old 04-09-2009, 12:24 PM   #3
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making WRX-level power. Duh
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Old 04-09-2009, 04:55 PM   #4
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Quote:
Originally Posted by williaty View Post
making WRX-level power. Duh
Yeah that seems obvious, at least to those of us who know you're not an idiot noob. (And I know you're not one of those, whiteghost)

I would not necessarily expect the rails to bolt neatly up, but it probably would be a simple fab to make them do so. On the other hand, I find it unlikely there's a significant difference between stock WRX rails and stock 2.5i/RS of the same year where they share injector shape. Unless you are wondering about aftermarket rails. But if you are, then why? WRX-level power doesn't need them, right?
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Old 04-09-2009, 05:02 PM   #5
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I'm trying to decide if I actually think the serial configuration of the fueling system is a liability. It seems that the very slight difference in fuel delivered to each cylinder becomes a larger and larger issue the farther you push the engine. With wild cams, 11.2:1 pistons, and a 7,000RPM or higher redline, I'm going to be asking quite a bit out of the engine.

Going to WRX injectors and a set of aftermarket parallel-run rails sounds like something I at least need to think about.
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Old 04-09-2009, 05:14 PM   #6
BAN SUVS
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I think the more logical first step would be just re-arranging the rubber lines into a parallel setup. Minimal cost and effort and solves the issue you're concerned about.
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Old 04-09-2009, 05:18 PM   #7
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Judging from pictures others have shown, the hardlines themselves are in a serial configuration.
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Old 04-09-2009, 05:28 PM   #8
BAN SUVS
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Ah, okay. I hadn't ever really looked at them. Still, just a quick chop and clamping a rubber line on here and there would do it.
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Old 04-09-2009, 08:05 PM   #9
recnelis
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Quote:
Originally Posted by BAN SUVS View Post
I think the more logical first step would be just re-arranging the rubber lines into a parallel setup. Minimal cost and effort and solves the issue you're concerned about.
http://northursalia.com/modification.../fuelrail.html

A little more involved, but probably not that much more difficult building the rest of the engine.
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Old 04-10-2009, 02:43 AM   #10
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yes if you convert to parallel, you have to replace the hardlines...

Still it's going to be much cheaper than getting aftermarket fuel rails. And even on WRX's, aftermarket fuel rails aren't really necessary until you're up into the 350+whp range...
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Old 04-10-2009, 09:15 AM   #11
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Quote:
Originally Posted by rougeben83 View Post
yes if you convert to parallel, you have to replace the hardlines...
Not quite true.
I converted to a parallel setup, and didn't modify a single hardline
http://ludicrous-speed.com/wiki/inde..._fuel_rail_mod
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