oleman77 Posted January 27, 2012 Share Posted January 27, 2012 (edited) Ok guys I'm looking for some help. My son just finished his swap from a EJ22 to a EJ 20K. Wow she's fast! I have a 78 Wagon which currently is powered by a gen1 EA 71. His old EJ22 was in great shape and I'm wanting to swap it in my old wagon. I have read quit a bit on older thread posts and have a lot of questions already answered. The engine will fit with modifications to engine compartment and cross member. My tranny will need to be changed. My EA71 is too weak. The question I have not read a lot on is the electrical. My son had to merge his harness but what would I have to do in my case? I have every little wiring as compared to the EJ22 wiring. My question is what would I need to do electrically? Do I send my EA71 and EJ22 harness and have them merged as well? There is a dude in California that did phenomenal job on my sons however it cost 600 bucks. Worth it for him but I'm not sure about me. Anybody have some good advice for me? Thanks for the help guys......Pete Edited January 28, 2012 by oleman77 Link to comment Share on other sites More sharing options...
Datsunrides Posted January 27, 2012 Share Posted January 27, 2012 While I have not done this on a Subaru, I have done EFI motor swaps on other old Japanese cars. Sometimes you get lucky and the EFI harness is standalone, other times you need to spend a bunch of time separating wires from the main harness. I would say to try and find a pre-OBD harness/ECU, as these are by far easier to wire in, usually only requiring a couple power supplies (batt and switched), some grounds, maybe a couple generic relays, and a couple wires run to items like the fuel pump. Which brings up the point that the fuel systems is usually the most difficult to do correctly. Easy way out is to just install an inline pump, but most of those are noisy, and you will run into starvation issue when the tank gets low. Intank conversion is not easy (unless you find a tank that will retrofit), but is the best way to go. Mark Link to comment Share on other sites More sharing options...
oleman77 Posted January 27, 2012 Author Share Posted January 27, 2012 I still have the ECU so that's not a problem. When you say "pre OBD harness" you lost me. Outback ??? As far as the fuel pump goes I still have my sons old one. Just need to figure out how to get it in the tank. I do have an old tank but it is trash. It had fuel left in it then sat for 20+ years in a field. I could probably cut out a portion of top of bad tank and fit it to the pump. Then drop my current tank, cut out same pattern and weld in new piece that would hold the fuel pump in the tank. Sounds like a pain but I would be willing to give it a shot if you think its doable. Link to comment Share on other sites More sharing options...
Datsunrides Posted January 28, 2012 Share Posted January 28, 2012 I should clarify that I meant pre OBD II. The OBD II wiring harnesses are much more complicated to transplant than the pre 1996 OBD I harnesses. Like I said, I am not that versed in Subaru EFI systems, but the older the harness/computer, the easier the retrofit will be. As for the fuel pump, I do what you are thinking, cut and weld a pump/sump from a newer tank with a similar depth the the original tank. This is no joke welding on an old gas tank, so please exercise extreme caution. My process is to flush the tank with water a few times to rid it of as much gas vapor as I can (There will ALWAYS be some vapor), then fill it most of the way with water while welding AND have a nitrogen purge on top of that, since nitrogen will not allow any vapors to ignite inside the tank. Mark Link to comment Share on other sites More sharing options...
oleman77 Posted January 28, 2012 Author Share Posted January 28, 2012 Ok thanks for the advice... Link to comment Share on other sites More sharing options...
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