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Old 05-02-2017, 12:19 PM   #1
imprezarz
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Join Date: Jun 2015
Location: washington
Vehicle:
1995 impreza coupe
Red

Default Impreza ej22t swap need guidance

I have both complete cars
1992 legacy sedan ss 5 speed 22turbo
And 1995 impreza coupe automatic

I have read countless places i need to splice the 2 harnesses together in order for the wiring to be proper and other places say i dont need to splice the engine harness together.

I know i need to swap ecu turbo crossmember harness tranny lsd diff and drive shaft and rear hubs 4x disk brakes and the pedals and clutch setup

But cant get a definitive answer on the wiring harness bit
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Old 05-04-2017, 07:11 AM   #2
lemonline
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1994 Impreza
Red

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What engine came in that impreza? 1.6?
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Old 05-06-2017, 05:13 PM   #3
lemonline
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Ej16?
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Old 05-08-2017, 11:26 AM   #4
imprezarz
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Sorry impreza is a ej18 automatic
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Old 05-09-2017, 01:10 PM   #5
lemonline
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The best way to do it is: download the ecu pinout of both engines. Install the ej22 with all its parts and sensors. Plug your existing wiring harness (ej18) to the new engine. Cut the wires at the ecu plug side and rewire them using the ecu pinout to fit the ej22 pinout. If any sensor wont plug, o is missing one wire, just add it following the ecu pinout. I did it in Ej16 with an ej22, ej18 should be much easy because the ej16 has almost no sensors
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Old 05-10-2017, 01:32 AM   #6
suberdave
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88 GL-10 STi
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Quote:
Originally Posted by lemonline View Post
The best way to do it is: download the ecu pinout of both engines. Install the ej22 with all its parts and sensors. Plug your existing wiring harness (ej18) to the new engine. Cut the wires at the ecu plug side and rewire them using the ecu pinout to fit the ej22 pinout. If any sensor wont plug, o is missing one wire, just add it following the ecu pinout. I did it in Ej16 with an ej22, ej18 should be much easy because the ej16 has almost no sensors
^ this is bad advise...

I have done many swaps:
EA82>EJ20G
EA82>EJ257
EA82>EJ22 N/A
EA82>EG33
EJ18>EJ207
EJ18>EJ20K
EJ253>EJ207
EJ252>EJ207
To name a few.

Dont try to use the EJ18 harness to run the EJ22t at all.

Strip down the EJ22t harness to what you need to run the engine, cut out the stuff like fans, ABS, A/C (if your not going to use it) youll keep that stuff from the existing car harness.

Use what is left, wire it into the car, and merge it into the existing harness to things like the Fans, Gauges, other sensors that are not on the engine...

If you dont have any idea what your doing, dont start a project like this. you will just end up with 2 cars that dont run. and are worthless. you'll end up selling them for pennies just to get them out of your yard.

Do lots of research. and spend time with wiring diagrams and manuals before you start.

if you need diagrams shoot me a PM ill get you what you need. i have done work with both of those engines before and have the diagrams and pinouts.

-=Suberdave=-
www.suberdave.com
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Old 05-10-2017, 07:53 AM   #7
lemonline
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I have only done one, but it works Great and didn't have to take out the Dashboard, done it in a day, plus I left the original ecu plugs, so If want, I can put the ej16 back on, and just unplug the ecu and plug in the old ecu. No problems so far
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Old 05-30-2017, 10:50 PM   #8
lifted_turbod_93
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dark blue

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I am doing a ej22 -> ej20, and you will definitely need to merge the harnesses. If it is your first time handling wiring, then I would not start unless you have another form of transportation lined up. You would need both harness pinouts and trace the wires and merge all the necessary sensors, it will be very time consuming. I would do countless research and planning, make sure you have every sensor accounted for in your diagrams before you cut anything, and try to only splice in one wire at a time to avoid mistakes.
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Old 06-22-2017, 03:36 PM   #9
cartwheels4amile
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But why would you kill a perfectly good 1992 Legacy SS? :[
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