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02-03-2018, 02:26 PM | #1 |
Scooby Newbie
Member#: 481576
Join Date: Feb 2018
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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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02-07-2018, 10:57 PM | #2 |
Scooby Specialist
Member#: 45494
Join Date: Oct 2003
Location: glen rock, pa
Vehicle:95 impreza L awd green |
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 |
02-13-2018, 01:24 PM | #3 | |||||
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
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.
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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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02-13-2018, 07:25 PM | #4 |
Former Vendor
Member#: 93646
Join Date: Aug 2005
Chapter/Region:
MWSOC
Vehicle:Many Track Records Let us help you go fast! |
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02-15-2018, 11:46 AM | #5 |
Scooby Newbie
Member#: 408701
Join Date: Dec 2014
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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... |
02-15-2018, 07:44 PM | #6 | |
Scooby Specialist
Member#: 45494
Join Date: Oct 2003
Location: glen rock, pa
Vehicle:95 impreza L awd green |
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02-16-2018, 07:12 PM | #7 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
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02-16-2018, 10:59 PM | #8 |
Scooby Specialist
Member#: 45494
Join Date: Oct 2003
Location: glen rock, pa
Vehicle:95 impreza L awd green |
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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