AF_3C2 Posted March 30, 2014 Share Posted March 30, 2014 I saw your response, and if you got a tuner you trust that says it will work, then go for it! Let us know how it goes- will be very useful for others thinking of other options available. Don't take my word for it all, I just learned it's easier sticking with USDM options as they are local for parts and support. Besides, that JDM transmission alone might be worth the price you are paying if it doesn't pan out. Is it 6 speed? Link to comment Share on other sites More sharing options...
LegacyDan Posted March 30, 2014 Share Posted March 30, 2014 Do you have a H6 already? if not i have one i can send you, no need to waste the cash on useless jdm crap! Link to comment Share on other sites More sharing options...
MooKz Posted March 30, 2014 Author Share Posted March 30, 2014 I saw your response, and if you got a tuner you trust that says it will work, then go for it! Let us know how it goes- will be very useful for others thinking of other options available. Don't take my word for it all, I just learned it's easier sticking with USDM options as they are local for parts and support. Besides, that JDM transmission alone might be worth the price you are paying if it doesn't pan out. Is it 6 speed? Well see, Subarus are like building blocks. You can basically use anything USDM as far as bolt ons and replacement parts. And no. This is the 5-speed transmission that will be coming with it. If it were the 6-speed, you better believe I would be using that one and swapping all of my USDM out to support the JDM. Link to comment Share on other sites More sharing options...
MooKz Posted March 30, 2014 Author Share Posted March 30, 2014 Do you have a H6 already? if not i have one i can send you, no need to waste the cash on useless jdm crap! If you have it in a few months, I would be glad to take it off of your hands. What engine model is it? Link to comment Share on other sites More sharing options...
LegacyDan Posted March 31, 2014 Share Posted March 31, 2014 its a 2006 uk 3.0 spec b EZ30D, not mine but ill be taking the 6 speed setup from it soon for peanuts so im sure the engine would go for the same. It all depends if Irish peanuts Have the same weight as US ones though! Full 6 speed spec b swap in parts is costing me $1200 not sure that translates to USD but a very good deal i thinks I got a full crashed jdm GT for 2 grand last year took the engine for my rebuild and sold the rest. So if your struggling to find what you need let me know. Plenty of crashed JDM and UK stuff nearby! Link to comment Share on other sites More sharing options...
scontivt Posted April 22, 2014 Share Posted April 22, 2014 What's funny is I have the opportunity to swap a V8 into my car right now. A 352 big block to be exact. If I want to do that, I'll have to find a trans that will bolt up and a rear end that will allow me to run all the camber that I have with binding axles. I do not wish to have a bell housing adapter made to mate my trans to that engine. Well, I don't have any idea where to get a V8 to EJ Series trans, but here's one to go from an EJ engine to a Supra/Toyota Pick-up trans :-) Link to comment Share on other sites More sharing options...
Deltaklop Posted April 22, 2014 Share Posted April 22, 2014 I'm am trying to figure out how to put that damn ej20x in my lgt, so ifyou have any updates Mooks, I would be very happy. Link to comment Share on other sites More sharing options...
Fastman350 Posted April 19, 2015 Share Posted April 19, 2015 Don't know if this thread is still alive , but ive just finished my JDM ej20Y swap into my 2005 Legacy i (Yes non turbo to turbo) . I just wanted to say , it is very possible to do if you buy the proper parts. (I bought a BL5 JDM front clip RHD). Mechanically, no sweet remove and re-install. Electronically well just say im glade im a electronic specialist because this swap is not for the faint of heart. I've learnt now that i would of probably saved a few hours of work to find a LGT LHD harness at the wreaking yard and just deal with the missing Quad AVCS wiring and other minor circuits. Instead i took the hard root and physically removed both engine management out of each wiring harness .. and spliced the JDM harness in my LEGACY i . And to my disbelief got in right the first time with no Codes or issues! The only issues that appeared since the swap are BIU issues. The Air Bag light is on because the JDM BIU is somehow not setup or controlling the seat belt warning light in the top console. My 10 000$ snap-on scanner cant read BIU codes on subaru's (imagine that) and I dont have access to dealer scanner, but i know theres a bunch of codes in there. Im gonna try to install both BIU and only use the JDM one for the immobilizer part. dunno worth a shot. Link to comment Share on other sites More sharing options...
Fastman350 Posted April 19, 2015 Share Posted April 19, 2015 This is the JDM engine management harness , all those green tabs are the labeled circuits I had to splice . about 60-70 splices . all in all about 100 hours of work just in wiring . Link to comment Share on other sites More sharing options...
MooKz Posted April 20, 2015 Author Share Posted April 20, 2015 Swapping the JDM engine into an LGT is really simple. MY USDM harness connected right to every sensor except for the exhaust AVCS sensors. I'm going to eventually have my friend make a plate for me to completely remove those sensors. This swap is straight forward. The only other real difference is the fact that it is a twin scroll setup. (And it is a 2.0 liter, not 2.5.) Damn, I love proving the "know-it-alls" wrong. And Fastman, kudos to you for swapping it into a Legacy 2.5i. That is a different story for sure. That is definitely much more challenging. Link to comment Share on other sites More sharing options...
Fastman350 Posted April 21, 2015 Share Posted April 21, 2015 Thanks Mookz , I love that little 2.0 good torque at the bottom with that twin scroll turbo. Im running the stock JDM tune which is plenty for mama's groceries get er. Link to comment Share on other sites More sharing options...
Deltaklop Posted April 22, 2015 Share Posted April 22, 2015 I did it too a year ago. Very simple swap but the engine is already dead since december :/ Link to comment Share on other sites More sharing options...
Fastman350 Posted April 23, 2015 Share Posted April 23, 2015 Deltaklop, go to sunrise Japanese in mtl. , that's where i got my half cut ordered from , they were very fair to me when you show cash They had ej2.0x and y and the older sti ej207 motors there just sitting on shelve ... Link to comment Share on other sites More sharing options...
vtoutback Posted April 23, 2015 Share Posted April 23, 2015 Hi all, I'm in the middle of resurrecting my 05 OBXT and just caught wind of the possibility of the EJ20Y swap option. I currently have my engine pulled and have yet to go down the parts buying path. For those that have done it, how does the finished product behave? What are the trade-offs you've noticed? What gas are you running / what mpg does it get? Can anyone confirm harness compatibility for the OBXT in addition to the LGT? I like the prospect of the twin scroll moving more torque into the lower rpms, as well as the 4.11 final drive gear for highway cruising. My car is a daily driver, and I have no plans for performance upgrades in the near future. If I were to pursue this path, what would be the best plan of attack? Any help would be greatly appreciated! Thanks, Eric Link to comment Share on other sites More sharing options...
Nightmaresmk Posted April 24, 2015 Share Posted April 24, 2015 LGT and OBXT are the same electronically. My setup i'm working on is a V7 swapped intake cams and sensors and use all my current parts but have a forged pistons and a 8k redline with a 18g. Link to comment Share on other sites More sharing options...
vtoutback Posted April 24, 2015 Share Posted April 24, 2015 Just for clarity, what is involved to mate the EJ20Y harness to my current harness ['05 OBXT]? Since the JDM setup is RHD, I see that the harness exits on the left side. Am I understanding it correctly that I would need to pull / swap over my current engine harness onto the new motor? Aside from the lack of wiring for the exhaust avcs sensors, is it just a matter of how the wiring is routed/dressed around the motor? Are you using the JDM ecu? Is is a matter of simply swapping my existing ecu, or is there more re-wiring involved. I work in the professional A/V field would like to think I'm fairly competent when it comes to wiring and electronics. If it's really a matter of the wire routing, I would consider building essentially an 'extension cord' from the engine's rhd harness to plug into the body side. Before I make any commitments to this swap, I want to ensure that the electrical system is not going to be a downward spiral. It is definitely important to me that all safety systems, etc. will be functional, and the car otherwise behave as normal. I get the sense this is something of a taboo topic - what am I missing? Link to comment Share on other sites More sharing options...
Deltaklop Posted April 24, 2015 Share Posted April 24, 2015 How much did you pay for your half cut?Deltaklop, go to sunrise Japanese in mtl. , that's where i got my half cut ordered from , they were very fair to me when you show cash They had ej2.0x and y and the older sti ej207 motors there just sitting on shelve ... Link to comment Share on other sites More sharing options...
Fastman350 Posted April 26, 2015 Share Posted April 26, 2015 I paid 3500 cash . When i tore into it , the clutch was shot so i called them up explained the sistuation ... took 3 weeks for next japan shipment , but he gave me pretty much brand new clutch with a good (looked new)dual mass flywheel . If your patient , there pretty good Link to comment Share on other sites More sharing options...
Fastman350 Posted April 26, 2015 Share Posted April 26, 2015 Forgot to mention . The whole drive line came with it also . Full spec b a arm front and rear with bilteins coil overs . Brakes were 100% good . Axle shafs , drive shaft , lsd rear end ... all the good stuff . Link to comment Share on other sites More sharing options...
MooKz Posted April 26, 2015 Author Share Posted April 26, 2015 Again, the USDM harness WILL WORK with the JDM engine. No need for a JDM harness or JDM ECU. Things to note: - These engines typically sit for a good while even before the reach the supplier that sells them to you. Having said that, be sure to pull the valve covers to lubricate the cams and buckets as well as the oil pan to lube the crank and connecting rods. Before you start the car, prime the fuel pump with fuel and the engine with oil. (Turn the key to the ON position and wait 3-5 seconds. Turn the key back to off and repeat 2-4 more times.) - If you get a swap and intend to use a top mount intercooler, buy a setup that already comes with an intercooler. Trust me, you will want to as they are very hard to find. Fortunately for me, I am using an STI manifold, a VF37, and a FMIC. So it will not matter to me. - Twin scroll stuff is fairly easy to find with some digging. However, if you are having issues, you can install your USDM single-scroll exhaust components and turbocharger. Twin scroll JDM swaps DO NOT have the boxer rumble. If you want to retain the rumble, put your stock manifold and turbo back on. - You will need to have your car tuned for this swap. Expect to pay for a minimum of 2-3 hours for dyno time and whatever your tuner charges for the tune. Hopefully this clears up somethings for everyone. While it is inexpensive, you are still going to end up spending near what you would have for a machine shop to rebuild your shortblock. If your engine is a total loss, this makes sense for you. But if you have a ringland failure, I would really just consider having a machine shop rebuild your shortblock for you. Link to comment Share on other sites More sharing options...
Fastman350 Posted May 4, 2015 Share Posted May 4, 2015 vtoutback , Im running the JDM ECU, BIU, and Cluster. everything came with my swap...even 2 keys! ... No codes no engine light on. I'm also running the stock tune on the JDM ECU witch I heard/read on this site could be a bad thing because of our north american crappy gas . I'm running premium fuel all the time and when I drive it (wife's car) I can tell it's cutting back on timing (pinging) on top end or heavy loads. If your not on the redline all the time I think you'd be ok. I have over 15 000 km's on my swap already with no issues (knock on wood ) I wouldnt go put reg. gas in there though, I think that would be asking for trouble. The only think I need to figure out is my air bag light ...seems like the JDM BIU doesnt like our USDM air bag module ! lol ... once I figure that out i will share . Link to comment Share on other sites More sharing options...
l88m22vette Posted March 26, 2017 Share Posted March 26, 2017 Updates? I'm waiting on a Spec-B front clip, still debating if I do the manual swap or just swap engines and sell the rest, but otherwise any new info or pointers would be awesome Link to comment Share on other sites More sharing options...
MooKz Posted June 23, 2017 Author Share Posted June 23, 2017 I figured I would bump this thread and fill everyone in on the outcome since I have had so many PMs requesting more information. I purchased the engine and was greeted with both intake AND exhaust AVCS. So what I did to avoid swapping cams out or going insane with a custom ECU and wiring, I tapped threads into the oil ports in the cam that go to the gear and then sealed them off with some quality thread sealant and set screws. I filed the excess metal off so that the gears would sit 100% flush. I then purchased the non-AVCS exhaust gears and installed them. That is the hardest part of the swap and it really wasn't that hard. The USDM harness connected right up. I had to have a base map made and put on to take care of the obvious displacement/compression differences. But other than that, it started right up and haven't had an issue. P.S. I have a spare EJ20X sitting around if anyone needs it. Link to comment Share on other sites More sharing options...
Shello007 Posted October 11, 2017 Share Posted October 11, 2017 Reviving the thread. I did the swap but it's running hella rich. giving me a headache. car runs smoothly but uses excessive fuel. Tuner doesn't seem to see anything that indicates that. My previous engine had TGV deletes. I wonder if the mechanic who did the swap re used that from the old engine and if that could be what's causing it? Link to comment Share on other sites More sharing options...
Shello007 Posted November 27, 2017 Share Posted November 27, 2017 Swapping the JDM engine into an LGT is really simple. MY USDM harness connected right to every sensor except for the exhaust AVCS sensors. I'm going to eventually have my friend make a plate for me to completely remove those sensors. This swap is straight forward. The only other real difference is the fact that it is a twin scroll setup. (And it is a 2.0 liter, not 2.5.) Damn, I love proving the "know-it-alls" wrong. And Fastman, kudos to you for swapping it into a Legacy 2.5i. That is a different story for sure. That is definitely much more challenging. Hey, Sent you a PM Link to comment Share on other sites More sharing options...
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