2.5RS Engine swap to EJ203 SOHC non turbo - Page 4 - Subaru Impreza GC8 & RS Forum & Community: RS25.com
 
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2.5RS Engine swap to EJ203 SOHC non turbo
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Old 08-10-2016, 01:56 PM   #31
Oakos Automotive
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PCV valve wont keept it from starting. my bet is on crank and cam gears.
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Old 08-11-2016, 07:18 AM   #32
matt167
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EJ251 uses the 6/7 trigger with a JECS ECU. The EJ203 uses a 36-2-2 trigger with a Denso ECU.

So indeed, you do need to swap the crank gear and drivers cam pulley.. After that it will get crank signals that it knows what to do with... If the importer had done their job and shipped the right engine to you, it would have worked the way it was but 201's are harder to find than 202/203's and otherwise still direct swaps
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Old 08-11-2016, 05:45 PM   #33
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Awesome, thanks Oakos and Matt, I will swap those over this weekend!
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Old 08-22-2016, 02:37 PM   #34
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Hey Kenny,

did switching the gears/pulleys work for ya? Currently debating getting a 203 or a used 251 locally. Leaning more to buying a lower mileage jdm motor.
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Old 02-08-2017, 04:59 AM   #35
kayen
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So I am thinking of doing this swap myself on my 2003 Forester. What I don't quite understand is if you get the EJ201/203 ECU along with the engines? The tuning is different between them, but nobody talks about swapping out the ECU's.

Last edited by kayen; 02-08-2017 at 06:07 AM..
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Old 02-09-2017, 03:16 AM   #36
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Its been stated above on page 4 thst you can simply swap some of the parts that you swap over. Matt167 posted it
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Old 02-09-2017, 11:41 AM   #37
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Does the year of each motor make a difference in the compatibility of the EJ253 to EJ203 swap? Currently I have a 2009 Subaru Impreza which I believe has the 253 motor. All over the place I have been able to readily find the JDM 203 motors with significantly less miles for hundreds less than a EJ253 that was pulled from something more current. Problem (or maybe not?) is that most of the EJ203s ive seen are from 2004-2005ish. Will this still be compatible?

Thanks in advance!!!
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Old 02-15-2017, 10:13 PM   #38
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Quote:
Originally Posted by Ringelholtz18 View Post
Does the year of each motor make a difference in the compatibility of the EJ253 to EJ203 swap? Currently I have a 2009 Subaru Impreza which I believe has the 253 motor. All over the place I have been able to readily find the JDM 203 motors with significantly less miles for hundreds less than a EJ253 that was pulled from something more current. Problem (or maybe not?) is that most of the EJ203s ive seen are from 2004-2005ish. Will this still be compatible?



Thanks in advance!!!


No these won't be compatible. The newer 06+ engines have avls heads which will throw a check engine light if it's not plugged in.


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Old 02-27-2017, 08:33 AM   #39
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Howdy all,

Wanted to chime in on this as I've recently just did the swap this past weekend. MY00 RS with the ej251 in it, swapped it with a JDM EJ203 and it works beautifully. Follow the instructions on the post and you wont have any hiccups. Literally all you have to do is swap over sensors(UD pulley sensor & drivers cam sensor), drivers side cam, under drive pulley gear and under drive pulley and intake manifold.

I plan on doing more testing and will come back with more info and further review of the engine. So far it's great, less power obviously but not too bad. can still get up and go. Lost the low end grunt of the torque but again, least the car wont fail. The power is actually a lot more liner and feels nice/smoother.

Here is the link of it running for proof.

JDM EJ203 in a 2000 Impreza 2.5rs - YouTube
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Old 03-09-2017, 09:24 AM   #40
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Just wanted to give an update on the car. Still running strong and no problems at all! I have roughly driven 500 miles on it. I did happen to run across P0130 from my Bosch front o2 sensor that's not even 2 years old but I think that's due to my middle exhaust flange (donut looking gasket) is practically gone. Will be switching it out and or deleting/welding in a piece of exhaust to get away with needing that stupid gasket.

I'll hopefully be starting a member journal as I've been wanting too for awhile but work on the car is very slow. Hope this helps the future swappers out there.
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