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Old 10-28-2019, 09:20 PM   #1
99dsmr
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Default 2004 subaru wrx what engine

Hey guys new to the site
So recently I picked up a 2004 Subaru WRX wagon supposably the car had a hybrid motor put into it. Suppsed to have a 2005 STI block and upgraded internals and the wrx heads. So after only 120 miles after picking it up it either has a rod knock or spun a bearing -_- so I'm looking to pull the motor out and rebuild it over time. But for the time being I just want to put the stock motor back into it so i can drive it. But I dont know which motor the car came with if it was avcs or non avcs
And i keep getting mixed answers.
Was also told to find a usdm motor and stay away from the jdm motor?
I've had 2 differnt shops quote me for a used motor and install they want 6500..
Want some other opinion or possible options
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Old 10-28-2019, 10:01 PM   #2
Dave D.
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Start out with completing your information and letting us know your region. Every region has shops that people can recommend or tell you to say away from. You should call a Subaru dealer in your region to get a quote as well (perhaps you already have). Give us more info (such as budget, etc.), and good luck while you are at it.
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Old 10-29-2019, 09:48 AM   #3
99dsmr
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I'm from the Chicagoland area I called the Subaru dealer and got part numbers for the engines but didn't get a quote on them doing the work
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Old 10-29-2019, 11:08 AM   #4
snow_bound26
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04 wagon came with EJ205 no avcs. Have you pulled the engine yet? If so, pull the heads and get some measurements. If the heads weren't machined to match the 2.5 block than you can get the short block from Subaru. If they have been machined get a JDM EJ205 without avcs for a (nearly) direct swap. This would be your least expensive option. As for installation, are you competent with a wrench?
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Old 10-29-2019, 08:51 PM   #5
99dsmr
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I havent pulled the motor yet
I know my way around tools im a diesel mechanic/car
I was told the heads were machined to match the block
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Old 10-29-2019, 11:50 PM   #6
snow_bound26
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Default 2004 subaru wrx what engine

Quote:
Originally Posted by 99dsmr View Post
I havent pulled the motor yet

I know my way around tools im a diesel mechanic/car

I was told the heads were machined to match the block


In that case get a jdm 205. It will be your least expensive option with heads. Generally they have between 50-70k miles on them. Got lucky with mine and it was written in the timing cover. Fairly easy swap since you know your way around tools. Can be done in your driveway with jack stands. Only thing I had help for was mating the block to the trans so I didn't crush/bends the pins and studs.

Last edited by snow_bound26; 10-30-2019 at 11:24 AM.
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Old 10-30-2019, 07:13 AM   #7
99dsmr
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Ok. I found a few of them.
This was also another question i ws gonna ask one of tune/performance shops told me to stay away from the jdm motors and stick with a usdm one
What all do i have to swap to the jdm motor heard the crank pully and cam gears.
Im new to the boxer engine coming from a 4g63
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Old 10-30-2019, 11:22 AM   #8
snow_bound26
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Default 2004 subaru wrx what engine

Quote:
Originally Posted by 99dsmr View Post
Ok. I found a few of them.

This was also another question i ws gonna ask one of tune/performance shops told me to stay away from the jdm motors and stick with a usdm one

What all do i have to swap to the jdm motor heard the crank pully and cam gears.

Im new to the boxer engine coming from a 4g63


I went in person to get mine and had them do a compression test on each engine until I found one that made me happy. Had to drive 3 hours to them but that piece of mind made it worth it. If you don't live within driving distance of an importer, call and ask questions and make sure they have a good return policy. They will require a certified mechanic for install for a valid warranty claim. There is one in Texas that has a good reputation. Believe they are in Dallas. I used JDM Depot in NJ.

As for what's needed to swap over, that really depends on which one you get. For the easiest swap find a non-avcs engine that has coil on plug. This will be easiest. If you find one of these then it depends on whether it's from a WRX or a Forester. Forester has a different coolant cross over pipe, PS pump and AC compressor so you'll need to take them from your engine. Otherwise it's plug and play.

If you get an avcs engine then get a non-immobilized avcs ecu to match (also make sure it's drive by cable or you will need to swap your intake manifold onto it). This will allow you to run avcs and makes a big difference in low-mid range torque. Going this route the differences between Forester and WRX still apply. Only addition is the wiring of the avcs which you can do yourself or get a kit from IA Tuning or iWire. Depending on local laws you may need the USDM ecu for emissions purposes.

You can also get an avcs engine and use you USDM ecu. This won't allow for the avcs. But depending on what performance you're hoping for it can be as easy as plug and play or you may want to swap some parts. If you go plug and play the intake cams will be fully retarded and you'll have power left on the table especially down low. So if this is just a temporary fix you probably won't care. If you want it to have at least as good performance as the USDM 205 then swap cams and cam gears. I believe you'll also need to swap cam position sensors if you go this route. But this way the cams aren't sitting fully retarded and you'll get back some low end grunt. The differences between Forester and WRX still apply.

And lastly, there's the wire on plug 205. This is essentially the same engine as the coil on plug internally. But will require the most parts swapped over to make it coil on plug.

I will say this. If you get a good running avcs engine they do have advantages. Having functional avcs is nice when you start using larger turbos. Helps with low end torque and spool. My VF34 spools as quickly as a TD04. They also run smoother and have better throttle response. I have the JDM ecu for daily driving and the USDM ecu for once a year when I do my NYS inspection. But depending on where you're from that may not be needed.

All of these options will require some tuning. The JDM versions typically have a CR of 9.0:1 compared to our 8.0:1. A few aren't but most are. And their ecu is matched to their fuel quality. If you're using anything other than a TD04 you'd need a tune anyway to account for the turbo. Most of these engines will come with a turbo. They can range from the tiny TF035 (used on the Forester) to various TD04 models. When purchasing you can tell if it came from a WRX or Forester by where the coolant crossover pipe points. If it points directly forward toward the radiator it's a WRX. If it points toward the passenger side headlight it's a Forester.

Last edited by snow_bound26; 10-30-2019 at 11:31 AM.
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Old 10-30-2019, 02:51 PM   #9
99dsmr
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Ok Thanks
I have a place here in chicago that sells the motors avcs and nonavcs
I just want to put the non avcs back it and be able to get back and forh to work for now then next year im planing on building a motor or getting one.
Now should i be concerned on prices? Ive seen some going for 899 and up.
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Old 10-30-2019, 06:04 PM   #10
snow_bound26
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Quote:
Originally Posted by 99dsmr View Post
Ok Thanks

I have a place here in chicago that sells the motors avcs and nonavcs

I just want to put the non avcs back it and be able to get back and forh to work for now then next year im planing on building a motor or getting one.

Now should i be concerned on prices? Ive seen some going for 899 and up.


That's about average for non-avcs. Just do your best to find one that's coil on plug
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Old 10-31-2019, 10:17 PM   #11
Bluestreak03
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If you get a JDM engine go straight to a ej207 and make sure it comes with the ECU it isn't hard to wire for AVCS I've done it numerous times already and get ready to have fun
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Old 10-31-2019, 11:36 PM   #12
kbtwofour
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What shops gave you a quote for $6K? Did you have a shop look at it?
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