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Old 05-02-2010, 03:52 AM   #1
shane falco
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Member#: 240005
Join Date: Mar 2010
Default Replacing 99 SOHC RS engine with 03 RS--please help

So it sounds like I should be posting here for my engine swap question. I recently bought a 99 RS and it turned out that the engine had a spun bearing. I bought an 03 RS engine and am hoping to get some definitive answers. Here's what I'd posted on the newbie forum a bit earlier. Thanks a lot.

Hello, I have begun the process of replacing my 99 SOHC RS engine [COLOR=#F82C70 ! important][COLOR=#F82C70 ! important][/color][/color]with an 03 RS engine[COLOR=#F82C70 ! important][COLOR=#F82C70 ! important][/color][/color]. I have read through countless threads about what is necessary to complete the installation and have found a lot of conflicting information. I would be extremely grateful if somebody could tell me what's necessary to make this as simple as possible (i.e., do I need to swap [COLOR=#F82C70 ! important][COLOR=#F82C70 ! important][COLOR=#F82C70 ! important][/color][/color][/color]intake manifolds? cam gears? deal with MAF/MAP issues?). Or should it be easier than this? If there's a previous thread you're aware of that deals with this issue, please point me to it.

Thanks so much for any info you can give me.
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Old 05-02-2010, 10:28 AM   #2
scarless ronin
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Join Date: May 2009
Chapter/Region: Tri-State
Location: Wilkes Barre, PA
Vehicle:
2000 Imreza RS
Dark Red

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my bad!! *shuts mouth*

Last edited by scarless ronin; 05-03-2010 at 09:33 AM.
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Old 05-02-2010, 02:04 PM   #3
2.5guy
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Join Date: Oct 2009
Chapter/Region: NESIC
Location: Wallingford CT
Vehicle:
00 2.5RS Coupe
Aspen White

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ok simplest way to swap a motor I recently put in an 06 in my 00 swap your cam and crank gears and your intake manifold. NOT your crank pulley they are the same! By crank gear I mean the gear that the timing belt goes on. Check to make sure your knock sensors are the same. That should be it.
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Old 05-02-2010, 07:48 PM   #4
Patrick Olsen
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Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

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I would suggest posting this in the Normally Aspirated Powertrain forum, as this isn't really a "built motor" kind of question.

With that said, scarless ronin's comments are not correct. There's no reason at all to worry about wiring harnesses and ECUs. The '99 and '03 engines are mechanically identical, or close enough that there's nothing to worry about with the '99 ECU running an '03 engine. You will retain all of the sensors from the '99 (most important the MAF, which the '03 doesn't have) and the '99 ECU and everything will be just fine.

IMO the easiest way to do the swap is to pull the bad '99 engine, remove the intake manifold (which has all the wiring, injectors, sensors, etc attached to it), install all of that on the '03 long block and you're good to do. I don't think that you'll even need to worry about swapping the cam and crank sprockets, but others in the N/A Powertrain forum could confirm that. (2.5guy had a different situation, as the '06+ 2.5i motors are a different variant of the SOHC EJ25 with variable lift cams. Honestly, I'm surprised he was able to use the '00 cam sprockets on the '06 cams!)

Pat Olsen
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Old 05-02-2010, 08:15 PM   #5
2.5guy
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00 2.5RS Coupe
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Yup bolted right up! VVT didn't work till I hooked up a manual switch, The reason I told him to switch the gears is just encase they where different. You would have to take them off to check to make sure they have the notch's in the same position's and have the same amount
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Old 05-04-2010, 10:31 PM   #6
shane falco
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Thanks a lot for the responses, everyone. Patrick, that's what we ended up doing (swapping intake manifolds only) and everything worked out perfectly.
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Old 05-04-2010, 10:54 PM   #7
Patrick Olsen
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QuickSilver Metallic

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Good to hear!
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