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Old 03-21-2006, 10:14 PM   #1
slidecontrol
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Default My 93 EJ18 > EJ (you decide)

Hello guys, I'm new to the subaru scene.

I have been reading for 2 days now, and have gathered more info than I can imagine. However, I am having a bit of a hard time organising everything I am reading. So, you decide for me.

I recently bought a 93 Impreza AWD with a weak 1.8L in it.

I'm looking for more power. In your oppinion, what will be the most plug and play,
my EJ18 to a EJ22
or EJ18 to a EJ25

Again, I want to know what is as close to drop in and go as possible.
Thanks!
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Old 03-22-2006, 12:34 AM   #2
Natoe
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the NA motors are pretty damn simple and bolt in, but you will soon grow tired of their slowness and want a turbo motor... most likely atleast. turbo=lots of wiring but its worth it.
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Old 03-22-2006, 12:44 AM   #3
Jish
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If its between a 22 and a 25, I would go with a 25. It may be harder to squeeze in, but it will be worth it.
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Old 03-22-2006, 12:57 AM   #4
snowman4us
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This is something that has been done before and works pritty well. This settup was in my car w/ the previous owner.
EJ18 engine, replace the short block w/ the 2.5. Get intake, full exhaust, Cams, and get the stock ECU flashed to 7K(suposedly the 1.8 ECU is pritty aggresive, from what i hear). The guy who had my car w/ this motor said it was at about 200CrankHP, and he would keep up w/ a WRX till high in 3rd gear.
And considering that this requires no wiring, and can all be done under $1000-1200 its about 1/4 of a cost of a turbo swap.
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Old 03-22-2006, 01:40 AM   #5
ballitch
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the EJ18 does run aggressive timing up top so be aware of that if you put a EJ25 in there, might need to run a higher grade of gas, like 89 oct. would do it. as far as fitment, they all fit just fine. go with a phase II EJ25 and use your stock engine management. might as well grab a header and maybe a catback or custom header-back exhaust. should be pretty much plug and play. the EJ18,22, and 25 ar all MAF based so it will run fine. DO NOT use your EJ18 heads on the EJ25 shortblock. if you want to get freaky like that use the EJ22 heads on the EJ25 block, but the EJ22 heads are not as good as the EJ25 heads.


~Josh~
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Old 03-22-2006, 02:30 AM   #6
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Quote:
Originally Posted by slidecontrol
Again, I want to know what is as close to drop in and go as possible.
Thanks!
A phase 1 EJ22 is the closest to "drop in and go" as possible. You basically just use the longblock, but re-use the intake manifold and all the wiring from the 1.8.
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Old 03-22-2006, 08:55 AM   #7
slidecontrol
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Awesome stuff guys !

So I guess it a toss up between the 2.2 and 2.5.

If I do go 2.5, can someone tell me how I can tell whether it is a phase I or II ?
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Old 03-22-2006, 10:19 AM   #8
Matt Monson
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Quote:
Originally Posted by snowman4us
This is something that has been done before and works pritty well. This settup was in my car w/ the previous owner.
EJ18 engine, replace the short block w/ the 2.5. Get intake, full exhaust, Cams, and get the stock ECU flashed to 7K(suposedly the 1.8 ECU is pritty aggresive, from what i hear). The guy who had my car w/ this motor said it was at about 200CrankHP, and he would keep up w/ a WRX till high in 3rd gear.
And considering that this requires no wiring, and can all be done under $1000-1200 its about 1/4 of a cost of a turbo swap.
Actually we used Ej22E heads. I am patently against putting the Ej18 heads onto the Ej25. Not only is the bore differential too great, but the compression ratio is stupid high...
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Old 03-22-2006, 01:50 PM   #9
smahala1286
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If read about people running ej25's off the 1.8 ecu with no management, something about the increace in displacementand the increace in cc's with the ej25 injectors canceling each other out. I dont like the idea of it without management but there are some people that have done it here. Search the swaps and conversions threads and you will find some info on it. Good luck.
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Old 03-22-2006, 02:54 PM   #10
Matt Monson
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Quote:
Originally Posted by smahala1286
If read about people running ej25's off the 1.8 ecu with no management, something about the increace in displacementand the increace in cc's with the ej25 injectors canceling each other out. I dont like the idea of it without management but there are some people that have done it here. Search the swaps and conversions threads and you will find some info on it. Good luck.
It's been done many times with nary an issue. That was supermoose's first swap, and Hawk has been running one for a few years now...
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Old 03-22-2006, 04:05 PM   #11
jamesfacts
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Quote:
Originally Posted by Matt Monson
Actually we used Ej22E heads. I am patently against putting the Ej18 heads onto the Ej25. Not only is the bore differential too great, but the compression ratio is stupid high...
Really? With an ITC or similar device, I'd think you'd be fine. I've always wanted to try a 25/18 hybrid like that for the hell of it.
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Old 03-22-2006, 06:36 PM   #12
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Quote:
Originally Posted by slidecontrol
If I do go 2.5, can someone tell me how I can tell whether it is a phase I or II ?
Phase I is DOHC, Phase II is SOHC.
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