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Old 02-03-2018, 02:26 PM   #1
SpreadmasterFresh
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Default EZ30R Swap into my 2003 Legacy GT Wagon

Hi so I have recently purchased my first Subaru and am new to this forum. I own a 2003 Legacy GT Wagon with a 5-speed transmission and I like it a lot. It has 112,000 miles on it and has been well maintained however I do know that the motor wont last forever. I have been surfing the forums and watching videos and have concluded that I would love to swap an H6 along with a stronger manual transmission into the car at some point down the road.

I am particularly interested in the EZ30R variant (2004 - 2009) and would Ideally like to match it to the STI 6-speed transmission or a WRX 5-speed. I understand that the EZ30D would be an easier swap however it was never offered here in the US with a manual transmission, so I know that comes with its own issues.

The EZ30R is just all around a better more powerful engine than the original EZ30D, however I have heard it is a much harder swap to pull off. I am very intrigued though and really do want to do this one of these days. My questions for the Subaru community are as follows:

1. Is swapping the newer EZ30R into my third Gen 2003 Legacy GT Wagon a reasonable thing to try and pull off provided I do have the time and money to do so?

2. What else on my Legacy would need to be upgraded/replaced to handle/fit with the more powerful engine.

3. About how much $$ would I be looking at spending to do such a swap: engine, transmission, and everything else (ECU, Exhaust system, etc)?

Thank you ahead of time to anyone willing to help me figure this out..
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Old 02-07-2018, 10:57 PM   #2
kay95
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I have been interested in this same swap myself. I probably wont have the time to do it but I did a little digging a while back.

The EZ30D would be the easy way to go. The ECU should be tuneable with a Tactrix from what I have found. You can turn off the any codes you might find and rewire what you cant relating to the ECU. I didnt research this much however I know for a fact that the EZ30R was mated to a STI 6spd in JDM land so if you could find that legacy just swap everything over. Might need to extend the harness and add a few things but should be very close.

If you used the ECU from the donor car I wouldnt think there would be much problems unless it is a CANBUS ECU. There are a few CANBUS emulators out there but I dont know how well they work.

Proof-This will get you the vast majority of the bits needed. It is a really good deal for the tranny and engine considering.
https://www.ebay.com/itm/JDM-SUBARU-...1ZFxNv&vxp=mtr
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Old 02-13-2018, 01:24 PM   #3
Patrick Olsen
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https://forums.nasioc.com/forums/sho....php?t=1323800 - Good information there for both of you, albeit in a massive thread so it may be hard to find exactly what you want. You also might consider the Six Swapped Subarus group on FB; probably more EG33 swapped cars there than EZ30-swapped, but I think the EZ30s are becoming more popular.

Quote:
Originally Posted by SpreadmasterFresh View Post
I understand that the EZ30D would be an easier swap however it was never offered here in the US with a manual transmission, so I know that comes with its own issues.
FWIW, the EZ30R was never offered in the US with a manual, either.

Quote:
Originally Posted by SpreadmasterFresh View Post
1. Is swapping the newer EZ30R into my third Gen 2003 Legacy GT Wagon a reasonable thing to try and pull off provided I do have the time and money to do so?
Sure.

Quote:
Originally Posted by SpreadmasterFresh View Post
2. What else on my Legacy would need to be upgraded/replaced to handle/fit with the more powerful engine.
Depends on your intended usage. If it's just going to be a fun street car, then you probably don't need to do anything. If you intend to auto-x or track the car, then improved brakes and cooling are always wise investments.

Quote:
Originally Posted by SpreadmasterFresh View Post
3. About how much $$ would I be looking at spending to do such a swap: engine, transmission, and everything else (ECU, Exhaust system, etc)?
That's pretty hard to say. Where are you going to source the parts? Who's going to do the work? If the answers are "junkyard" and "me", then the answer is going to be thousands of dollars less than if the answers are "ebay auctions" and "a shop".


Quote:
Originally Posted by kay95 View Post
I didnt research this much however I know for a fact that the EZ30R was mated to a STI 6spd in JDM land so if you could find that legacy just swap everything over. Might need to extend the harness and add a few things but should be very close.
There was also a manual EZ30R variant in the UK. I know of 1 guy who successfully swapped in an EZ30R with a manual using UK components. I can't remember what combination of ECU, Immobilizer, key, etc he ended up using - I think he was posting about his trials and tribulations in that thread I linked above.

Quote:
Originally Posted by kay95 View Post
If you used the ECU from the donor car I wouldnt think there would be much problems unless it is a CANBUS ECU.
And there's the rub - the '05+ EZ30Rs (and EZ36s) use a CANbus ECU. Most folks advise using an aftermarket ECU of some sort rather than fighting with the OEM bits.
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Old 02-13-2018, 07:25 PM   #4
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Old 02-15-2018, 11:46 AM   #5
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if you're looking for a challenge and don't mind custom work, you might consider ditching the EZ30's stock wiring altogether and setting it up to run on some other automaker's 6-cylinder ECU.

GM V6 for example, wiring and stuff is everywhere, they use a variant of the LSx ECU which thousands of tuner shops around the country will know how to tweak as needed to make it run. also sensors and stuff can be found at local parts stores...

the hard part is figuring how to make brand XYZ cam/crank sensors read off the Subaru engine, maybe you can finagle a trigger wheel on the crank pulley...
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Old 02-15-2018, 07:44 PM   #6
kay95
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Quote:
Originally Posted by v2rocket_aka944 View Post
if you're looking for a challenge and don't mind custom work, you might consider ditching the EZ30's stock wiring altogether and setting it up to run on some other automaker's 6-cylinder ECU.

GM V6 for example, wiring and stuff is everywhere, they use a variant of the LSx ECU which thousands of tuner shops around the country will know how to tweak as needed to make it run. also sensors and stuff can be found at local parts stores...

the hard part is figuring how to make brand XYZ cam/crank sensors read off the Subaru engine, maybe you can finagle a trigger wheel on the crank pulley...
It would be much easier to run a stand alone. If running a EZ30D you would only need to repurpose one wire to make it run from a four cylinder car. If you wanted to run a EZ30R that might be alittle more work and expensive because the number of ECUs available to run six cylinders and active cams isnt very large.
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Old 02-16-2018, 07:12 PM   #7
Patrick Olsen
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Quote:
Originally Posted by kay95 View Post
If running a EZ30D you would only need to repurpose one wire to make it run from a four cylinder car.
How does that work?
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Old 02-16-2018, 10:59 PM   #8
kay95
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If you run a MS2 the fuel injectors are batch fired per bank because there are only two channels available. So the two extra injectors can be wired in parallel with the existing injector. The extra wire would only be needed for the third spark channel if setting up the COP as wasted spark. MS2 is a very simple but effective stand alone. You dont need as much control as MS3 or a lot of other stand alones to have a nice idle or smooth throttle transitions. Though some for the features are nice to have.

Now if you want the COPs to be controlled individually or injectors true sequential then you are going to need a lot more wires. This is only with a stand alone the OEM ECU would need even more wires to make it happy.
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