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Old 03-24-2009, 04:42 PM   #1
Rei_Akira
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Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
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1997 GC8 coup
green

Default questions about EG20K swap

i have a 97 coup and planning on swapping in a EJ20K engine/trannie/rear diff. i have a full wire loom from the front clip, abit the harness that leads to the back is cut.

now, do i have to use the full harness or can i use part of the USDM harness and part of the STI harness? im sure someone has done this before and a little help would be appreciated.
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Old 03-25-2009, 12:24 AM   #2
Jaxx
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Join Date: Aug 1999
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Location: Boise,Idaho,USA
Vehicle:
The 93 Imp W/EJ20K
flat black

Default

parts of each
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Old 03-25-2009, 12:23 PM   #3
Rei_Akira
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green

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ok, im assuming to just use the engine harness and use the rest of the USDM harness?
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Old 03-25-2009, 02:00 PM   #4
Jaxx
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Join Date: Aug 1999
Chapter/Region: NWIC
Location: Boise,Idaho,USA
Vehicle:
The 93 Imp W/EJ20K
flat black

Default

i should bookmark these write ups

what i have deamed the ver.III method (named for the nasioc user ver.III)

-strip new harness down to the engine components
-pull out glove box (and Ac core if possible) leave dash in place
-disconnect old engine harness and ecu from dash harness at big multi connectors near heater box
-pull old harness back through the firewall remove from car
-splice new harness into old harness on the bench leaving old harness intact (i stripped out all the old pieces .. he keeps them in place so that it is reversible) do you have the spread sheet of what splices to what?
-new harness will have 2 arms 1 for the drivers side (which normally goes through the fender) and one for the passenger side.
-Pull new engine harness through the firewall in gromet above turbo, run the drivers side along the engine side of the firewall (encase in flex loom)
-reconnect to engine

the really great part thing is that the new engine harness is easily removable, less than 5 min if you made an error (you probably will)
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Old 03-25-2009, 10:06 PM   #5
Rei_Akira
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Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

do you have the link to the spread sheet for what splices to what? i havn't been able to find any sort of wiring diagrams for the v4....
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Old 03-26-2009, 11:44 PM   #6
elislider
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03 Legacy GT wagon
I love goooollllllllddddd

Default

Quote:
Originally Posted by Jaxx View Post
i should bookmark these write ups

what i have deamed the ver.III method (named for the nasioc user ver.III)

-strip new harness down to the engine components
-pull out glove box (and Ac core if possible) leave dash in place
-disconnect old engine harness and ecu from dash harness at big multi connectors near heater box
-pull old harness back through the firewall remove from car
-splice new harness into old harness on the bench leaving old harness intact (i stripped out all the old pieces .. he keeps them in place so that it is reversible) do you have the spread sheet of what splices to what?
-new harness will have 2 arms 1 for the drivers side (which normally goes through the fender) and one for the passenger side.
-Pull new engine harness through the firewall in gromet above turbo, run the drivers side along the engine side of the firewall (encase in flex loom)
-reconnect to engine

the really great part thing is that the new engine harness is easily removable, less than 5 min if you made an error (you probably will)
this is pretty much the best method and what i should have done for mine (i did mostly this just screwed up a part since i was new to wiring, but now i know). it works perfectly for OBD1 imprezas (93-95).

however for a 97 model year impreza, they are OBD 2 so if you need to pass OBD emissions in your area then its going to be more complicated than what jaxx outlined. if you dont need emissions to pass then that makes it easier

the v4 engine wiring is pretty much exactly the same as the v3 however the v4 has the updated dash, so the gauges and climate and everything are different.
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Old 03-27-2009, 01:14 PM   #7
Rei_Akira
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Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

ya, i'll be using the climates out of my car, since the V4 is full electronic and i havn't been able to find anything here in the states that's similar.

and no emissions for me XD
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Old 03-29-2009, 12:59 PM   #8
Rei_Akira
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Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

any idea how long the wiring took for you guys?
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Old 03-29-2009, 01:19 PM   #9
Jaxx
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Member#: 177
Join Date: Aug 1999
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Location: Boise,Idaho,USA
Vehicle:
The 93 Imp W/EJ20K
flat black

Default

8-12 hrs
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Old 03-29-2009, 01:45 PM   #10
Rei_Akira
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Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

sweet, so its do-able in a day or two. sweeeeet, maby i'll even get around to painting my car over break...
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Old 04-26-2010, 04:00 PM   #11
Dori Ninja
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sorry to bring up an older thread, but im getting ready to do an EJ20K swap in my 00 RS and the guy im getting my harness from said he has the harness just on the manifold...now i found someone with a merged harness that is willing to trade for my un-molested harness, but he would need "everything under the dash" as he put it...so would it be harder to splice the harness i get with the oem harness then again for the ecu, or should i go through the pain of pulling the harness????
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Old 04-29-2010, 04:57 PM   #12
JDMG3
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Location: Gatineau, Quebec, Canada
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1997 Legacy Outback
Green

Default

PM for any info. I've done it. Search my post ''Leg Outback V4'' and I have some info and if needed links for the wirring.
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