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Old 02-11-2019, 02:48 PM   #1
Boosted_Benson
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Member#: 492727
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2002 Impreza WRX
Sedona Red Pearl

Impreza WRX STi First EJ207 Swap

I'm doing a JDM version 7 EJ207 swap into my 2002 wrx. I had a question before I bit the bullet and bought everything I needed for the swap.

So I'm pretty sure you can use the stock wire harness from my USDM motor on the JDM with the exception that my harness doesn't have the AVCS wires. The fix for that is just an AVCS bulkhead wire set? OR would it be easier to swap the whole harness?

Also I'd appreciate any more information on what I should know before attempting this swap, issues I might face or anything that'll make it easier to install.
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Old 02-11-2019, 03:11 PM   #2
Scuby04STi
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Quote:
Originally Posted by Boosted_Benson View Post
I'm doing a JDM version 7 EJ207 swap into my 2002 wrx. I had a question before I bit the bullet and bought everything I needed for the swap.

So I'm pretty sure you can use the stock wire harness from my USDM motor on the JDM with the exception that my harness doesn't have the AVCS wires. The fix for that is just an AVCS bulkhead wire set? OR would it be easier to swap the whole harness?

Also I'd appreciate any more information on what I should know before attempting this swap, issues I might face or anything that'll make it easier to install.
In just a single google search for "v7 ej207 swapped 2002 wrx" I found 12 detailed threads on this. And several more that are threads detailing each option you can take.


Search more, there are SEVERAL answers to your questions it's more what way would you prefer.
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Old 02-11-2019, 03:34 PM   #3
MortonCharbo
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You should just leave the ej207 harness on the engine. The three plugs where it goes in to the cars wiring harness are the same. If you're using the USDM ECU, you won't have avcs, but you'll have the wiring on the engine side already. You just need to add the bulkhead wiring, and a JDM ECU.
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Old 02-11-2019, 05:31 PM   #4
Boosted_Benson
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Originally Posted by MortonCharbo View Post
You should just leave the ej207 harness on the engine. The three plugs where it goes in to the cars wiring harness are the same. If you're using the USDM ECU, you won't have avcs, but you'll have the wiring on the engine side already. You just need to add the bulkhead wiring, and a JDM ECU.
Sorry yeah Iím doing the jdm ecu aswell
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Old 02-11-2019, 07:18 PM   #5
MortonCharbo
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Originally Posted by Boosted_Benson View Post
Sorry yeah Iím doing the jdm ecu aswell
Then leave the engine harness there. It'll plug directly in to your car. You can do the bulkhead wiring yourself or pick up a kit from iatuning or iwire for a couple hundred. Comes with good instructions and saves a lot of headache if wiring isn't your forte.

The only things I can think of needing to be changed possibly is the coolant crossover on top of the block, and maybe some of the oil lines for the AVCS and oil cooler if your car has one.

Besides that, I recommend doing some maintenance before you drop the engine in. Timing belt, water pump, spark plugs, valve cover gaskets etc.

If you have some basic mechanical skills, it's not nearly as difficult as you think it is once you start doing it

I will agree with the other poster, you should do a ton of searching before doing this. But there's nothing wrong with making a post like yours. If all anyone did on a forum was search, the forum would be dead with no new posts.

Best of luck, and keep asking questions if you have them.
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Old 02-11-2019, 07:36 PM   #6
Scuby04STi
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Quote:
Originally Posted by MortonCharbo View Post
Then leave the engine harness there. It'll plug directly in to your car. You can do the bulkhead wiring yourself or pick up a kit from iatuning or iwire for a couple hundred. Comes with good instructions and saves a lot of headache if wiring isn't your forte.

The only things I can think of needing to be changed possibly is the coolant crossover on top of the block, and maybe some of the oil lines for the AVCS and oil cooler if your car has one.

Besides that, I recommend doing some maintenance before you drop the engine in. Timing belt, water pump, spark plugs, valve cover gaskets etc.

If you have some basic mechanical skills, it's not nearly as difficult as you think it is once you start doing it

I will agree with the other poster, you should do a ton of searching before doing this. But there's nothing wrong with making a post like yours. If all anyone did on a forum was search, the forum would be dead with no new posts.

Best of luck, and keep asking questions if you have them.

Agreed!!!


It just helps to show you have looked before you ask, otherwise you will need a fire suit on here.


On these swaps I mostly point to look at old threads because there is literally as many ways to make it work as someone can dream up. Some work better, some worse and some focus on specific goals that might line up with your own.


Good luck, I nearly did one till my brother totaled my wrx and I found a good deal on an STi.
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