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Old 07-08-2020, 08:02 PM   #1
inxces
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Default 2004 XT Engine Replacement

The 2004 and 2005 Forester XT engines seem to be specific to those years. What do people recommend as a replacement engine? Only an 04-05 XT engine? Is there any easy swap upgrade engine? Are there any JDM engines that are the same? I certainly don't want a 2.0 liter JDM engine as so many are trying to sell!
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Old 08-03-2020, 03:15 AM   #2
typeZero
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I'm kinda in the same boat, I more than likely same boat I was thinking of doing the forester sti 2.5 motor swap. I'm thinking of the ej20x because I need get this thing running solid
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Old 08-03-2020, 08:32 AM   #3
danger1138
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Quote:
Originally Posted by inxces View Post
The 2004 and 2005 Forester XT engines seem to be specific to those years. What do people recommend as a replacement engine? Only an 04-05 XT engine? Is there any easy swap upgrade engine? Are there any JDM engines that are the same? I certainly don't want a 2.0 liter JDM engine as so many are trying to sell!
Just curious as to why not to the jdm 2.0 engine? I think forester xt's come with 2.0 engine out there in japan.
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Old 08-03-2020, 11:38 AM   #4
subaru_gc8
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you can buy a ra short block and put your heads on there, it all depends on what you are looking for
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Old 08-03-2020, 07:52 PM   #5
kharmicresonance
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04/05 USDM XT is kind of unique, in that it has the 4.44 final gear ratio. This means that swapping in a USDM or JDM ej20 is not the loss you may think it to be, especially if it is a nicely built ej22 or ej207. Their rev limit is higher and there is a lot more potential high rpm power to be had from them.

That being said, the ej25 that came in it originally is the exact same ej25 that came in the 04/05 STi. The b25 heads are unique to those years, they are slightly different from the following years (d25), as are the pistons. They had a slightly lower static compression ratio, which allowed you to throw more boost at them ( which is what helped cement the American image of the Sti ). The b25 heads are getting harder to find ( in good condition ) and there were just a lot more d25 heads made.

Any swap other than an 04/05 XT/STi engine is going to require ECU work.

Bottom line ( If doing the work yourself ):

easiest swap (but hardest to find ) = original 04/05 USDM XT/STi engine
not so easy swap ( but much easier to find ) = any working ej25
hardest swap ( but arguably most rewarding ) = ej22 or ej207

Of course, if you have the budget, the easiest thing to do would be to drop it off to your closest trustworthy tuner and have them drop in a built engine from IAG/OutFront/RallyTek/etc.
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Old 08-08-2020, 03:27 AM   #6
SlammedSix
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Well if your looking for a full motor with intake and injectors harness and ready to drop in then your are stuck to 04-05 XT/STi

But if you are just using a long block (Heads/Block) you can use any EJ25 with Single AVCS
Forester 2004-2012 (Before they switched to FA), STi 2004-2007, WRX 2006-2014, Legacy 2005-2012, Outback 2005-2009, Baja 2004-2006

The EJ25 block is basically the same between all years up until present STi's, the pistons were slightly different in certain years but it was 8.2:1 compression or 8.5:1 compression. The cranks had small variations but basically remained the same.

The heads basically break down to 3 style of heads the B25, D25 and 2007 STi has V25 heads. The combustion chambers were slightly different in size but nothing too drastic. There were difference from year to year on the sodium filled valves and some didn't but thats not a big deal either. Same size valves, ports and overall same head.

The only thing that is needed when using the D25 or V25 heads are to use the Secondary Air Injection delete plates. Since these motor came with the additional smog equipment.

I have pulled apart many motors and have done JDM swaps and am very familiar with how to get the electronics to work and what parts need to be swapped to make it work.
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Old 11-17-2020, 05:30 PM   #7
inxces
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Sorry I missed those last replies until now.

I'm paying a shop to do this, and I want it to be as reasonably economical as possible. So I don't want any ECU work.

It's the lower end that is gone. Supposedly threw a rod due to lack of lubrication from sitting. Seems unusual, but that's what I was told. Makes me concerned about buying any used engine.

What about just buying a block and transferring over my top end? Would that be more expensive than dropping in a used 04/05 engine?
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Old 11-17-2020, 11:53 PM   #8
Dave D.
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Buy a block and transfer. Simplest and probably cheapest.
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Old 11-18-2020, 12:03 AM   #9
SlammedSix
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Quote:
Originally Posted by inxces View Post
Sorry I missed those last replies until now.

I'm paying a shop to do this, and I want it to be as reasonably economical as possible. So I don't want any ECU work.

It's the lower end that is gone. Supposedly threw a rod due to lack of lubrication from sitting. Seems unusual, but that's what I was told. Makes me concerned about buying any used engine.

What about just buying a block and transferring over my top end? Would that be more expensive than dropping in a used 04/05 engine?
Buying a short block and transferring over parts is always the easiest and best route in my opinion. The problem is when you spin a bearing and have bearing material go through your whole motor it usually will damage and contaminate alot of parts on the vehicle.

I would be looking at cam journals for any scaring that can be caught with a fingernail. If so essentially the heads are not repairable.

If bearing material was sent through the motor it is highly recommended to replace the oil cooler ($250), cam gears for AVCS on intake side ($160x2), Oil pump assembly ($140) Oil control valves ($120x2) Oil pan ($120) Oil pickup ($30) Also check screens for AVCS Oil bolts.

So swapping out a short block is not always a simple thing when metal gets spit through your whole oiling system.
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Old 11-18-2020, 10:21 AM   #10
Max Capacity
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The correct way is to get a new OEM ej257 short block and engine gasket set for your car, have your heads rebuilt.

That has been proven to work well for many years.

I have over 140,000 trouble free miles on that set up.

SlammedSix has good info too.

I have become the poster child for how to do this right the first time. Here's my thread.

https://legacygt.com/forums/showthre...-r-184106.html
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