The RS and Injectors/Fuel Rails, Etc.

williaty · 04-08-2009, 11:53 PM

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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Whiteghost 2.5 · 04-09-2009, 11:50 AM

what are you doing that requires WRX injectors?

williaty · 04-09-2009, 12:24 PM

making WRX-level power. Duh

BAN SUVS · 04-09-2009, 04:55 PM

Quote:

Originally Posted by williaty

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?

williaty · 04-09-2009, 05:02 PM

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.

BAN SUVS · 04-09-2009, 05:14 PM

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.

williaty · 04-09-2009, 05:18 PM

Judging from pictures others have shown, the hardlines themselves are in a serial configuration.

BAN SUVS · 04-09-2009, 05:28 PM

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.

recnelis · 04-09-2009, 08:05 PM

Quote:

Originally Posted by BAN SUVS

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.

rougeben83 · 04-10-2009, 02:43 AM

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...

Skidd · 04-10-2009, 09:15 AM

Quote:

Originally Posted by rougeben83

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

04-08-2009, 11:53 PM	#1
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	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? * Registered users of the site do not see these ads.

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04-09-2009, 11:50 AM	#2
Whiteghost 2.5 Scooby Specialist Member#: 72994 Join Date: Oct 2004 Chapter/Region: South East Location: Spring Hill FL Vehicle: 2001 Racekor Emerald Green	what are you doing that requires WRX injectors?

04-09-2009, 12:24 PM	#3
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	making WRX-level power. Duh

04-09-2009, 05:02 PM	#5
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	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.

04-09-2009, 05:14 PM	#6
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	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.

04-09-2009, 05:18 PM	#7
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	Judging from pictures others have shown, the hardlines themselves are in a serial configuration.

04-09-2009, 05:28 PM	#8
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	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.

04-10-2009, 02:43 AM	#10
rougeben83 Scooby Guru Member#: 115154 Join Date: May 2006 Chapter/Region: MWSOC Location: NYC Vehicle: 2003 Legacy L Turbo silver	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...