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I have an 05 Aero with a blown engine and want to put a 2.5 either out of an 06 or a JDM. Can I do it without any major mods? Are any mods required or can I drop it in a go?
Last edited by mark458 (2019-02-06 10:48:02)
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Since it's an Aero you're in good shape, either no wiring or if you want AVCS minimal wiring needs to be done. But still lots to consider, pros and cons to different approaches, search on NASIOC for details. I have an ej255 that was installed into a MY05 Aero, it needed the Cosworth cam bracket, ej205 IM and a few other bits.
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From what I was able to find, Id have to swap out the crank sprocket, left cam sprocket, intake and exhaust manifolds. If that's all I have to do Im happy to do it...
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Is that all that needs to be done? Whats this wiring that needs to be done?
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Forget what he said. you CANNOT run an EJ255 (06+ WRX) motor on the wiring or ECU in your car. They are totally incompatible due to cam signalling differences (in wiring and sensors)
If you wanted to do that you would basically have to do a wiring conversion which would involve merging parts of the EJ255/EJ257 wiring into your EJ205 body harness, and then using the correct ECU.
that IS an option, its basically the exact same process as doing an STi engine swap.
The cheapest option is to either find a good running stock replacement motor for your EJ205 or rebuild the one you have. It would be predictable, reliable, and low complexity.
If you get a JDM EJ20 import motor with intake AVCS, it would have to be one of the early engines with 2-wire rear cam sensors and the 2 wire front (left intake) cam sensor.
This engine can run without AVCS on your stock ECU, though it would definitely want to get a tune.
Or you can get the IAG AVCS wiring add-on https://iatuning.com/products/subaru-av … l-bulkhead - and then get the JDM ECU (also strongly recommended to get a tune as well for USA gas)
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elislider wrote:
Forget what he said. you CANNOT run an EJ255 (06+ WRX) motor on the wiring or ECU in your car. They are totally incompatible due to cam signalling differences (in wiring and sensors)
If you wanted to do that you would basically have to do a wiring conversion which would involve merging parts of the EJ255/EJ257 wiring into your EJ205 body harness, and then using the correct ECU.
that IS an option, its basically the exact same process as doing an STi engine swap.
Whoa, slow your roll a bit. I'm far from an expert on this stuff but an EJ255 can be used in a 16 bit car (like an 05 Aero), with a few changes which OP mentioned above. It does not require rewiring nor running the ej255 ECU. I'm sure there are other caveats I'm not familiar with but as I mentioned I bought a wrecked MY05 Aero with a EJ255 in it and it was running.
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Its not nearly as simple as you're making it out to be.
mark458 mentioned "swap out the crank sprocket, left cam sprocket, intake and exhaust manifolds"
crank gears are the same. cam gears are totally different and intake ones are not swappable. the heads themselves are drastically different including the types and locations of the cam sensors (EJ205 has 1 at the cam gear and EJ255/EJ257 are on the rear of each intake cam). intake manifolds have to match the wiring/ECU type since thats where all the other sensors basically go. exhaust manifolds are swappable and/or basically the same.
So any EJ motor can be used in an EJ-based chassis. But if you want to run an EJ255/EJ257, you need the wiring and ECU for it. and the gas pedal (drive by wire).
there are significant wiring differences that are not simple to implement. basically you'd be doing a wiring conversion.
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What about a proper hybrid, stock ej257 short block and modified usdm ej205 heads or an ej257 with hybrid specific pistons ?
With a set of jdm avcs ej205 or ej207, avcs wiring and jdm avcs ecu he could stay with the 16bit wire platform on the 2005 aero and have functional avcs.
Last edited by Rodman (2019-04-23 00:39:31)
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^ yes. thats just a lot of work
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A 257 short block with machined usdm ej205 heads would be the simplest way.
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Hey Rodman,
Could you elaborate on "machined" usdm ej205 heads? I'm guessing this means more than just having the mating surface of the heads machined to be coplanar?
As well are you saying no ECU or harness modifications are needed with a ej257 short block and the original ej205 components bolted on?
Thank you all for sharing your wisdom!!!
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It's known as a hybrid engine build, the 2.0 cylinder heads get a slight modification to match the 2.5 cylinder bore. There are shops like IAG, Outfront and Andrewtech that are well known for the modification needed. You would use an STi cylinder head gasket and bolt on all the parts off the 2.0l motor. You will want to get a proper tune for it when is all done.
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Machining the EJ205 heads for a hybrid build is not necessarily to match the bore, thats not really the important part (though it is a factor). the important part is compression ratio; the EJ205 heads have a smaller dish so by machining out material you gain some dish and drop the compression
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It’s a rather simple modification needed and all the rest of the 2.0L motor parts bolt on.
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