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Old 08-29-2003, 12:09 AM   #1
Scooby Newbie
Member#: 36318
Join Date: May 2003
Chapter/Region: NWIC
Location: OR
2002 wrx
sold :(

Default engine swap worth the work? 2.5NA motor in older gc

Hey guys and gals, i'm just wondering what ya'll think about swapping a NA 2.5 motor into a older impreza. Will it be lighter than the RS's or is it the motor that makes the rs heavier? Whats the weight difference between the 1.8 motors and 2.5 motor. For instance if one swaps the 2.5 motor in a lighter 93 impreza will it weight the same as a 2000 rs? Any advantage in this swap and is it worth the time effort and money. Tell me what u all think.
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Old 08-29-2003, 05:34 AM   #2
Scooby Guru
Member#: 2272
Join Date: Sep 2000
Chapter/Region: BAIC
Location: Fire Caves
2017 GTI/1999 OBS


The EJ25 weighs about the same as the EJ18, its not the engine weight that accounts for the 200lbs weight difference between an RS and an older L.

Yes, it would be VERY much worth it. First of all, you get a newer motor with less miles... that alone is worth it over a useless old 1.8l engine. Secondly, the 1.8 sucks... sucks sucks sucks, i cant tell you how much it sucks The 2.5 will make all the difference in the world, just go drive someones RS around the block and see for yourself...

Personally, im sick and tired of having to be in 3rd gear at 6000rpms to maintain speed going up a steep hill
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Old 08-29-2003, 10:33 AM   #3
Kevin Thomas
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Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
1989 1989 XT6

Default Ahhh

Wasn't there someone in named MCU?? on here that did this swap and had a big write up on it? I searched and can't find the thread but it wasn't too long ago when it was done.
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Old 08-29-2003, 04:31 PM   #4
Homicidal Maniac
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
2008 STI


There are a couple people who have done it. It was originally my plan until I was fixated on the EJ20.

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Old 08-29-2003, 07:14 PM   #5
Scooby Newbie
Member#: 36318
Join Date: May 2003
Chapter/Region: NWIC
Location: OR
2002 wrx
sold :(


Yeah i'm familiar with the 2.5rs. I use to have one. Its a '02 model tho with means it weighs about 2950 lbs. How much cheaper and easier is it to do the 2.5 motor over the 2.0turbo motor. If its not that much different in price i think the wrx motor will be a better choice right? Thanx for your replies
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Old 08-29-2003, 11:34 PM   #6
Scooby Specialist
Member#: 14555
Join Date: Jan 2002
Chapter/Region: MWSOC
Location: MI
1995 Impreza L


I have a 2.5 in my L. I did it because my 1.8 was old and leaky and i got a really good hookup on the parts needed for the swap. Its running off the 1.8 ECU and i must saythe extra power is well worth it. If you were going to do a swap purely for better performance then ide probably swap out the whole ECU and harness and everything as well. If you do it yourself, its still worth it. If you are going to pay some shop to do it for you ide probably recommend looking into spending alittle more and going with an EJ20 and the other related components. It will still be lighter than an RS.
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Old 08-30-2003, 12:27 AM   #7
Homemade WRX
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Location: Mooresville, NC
96 3MI Racing LLC
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hi, I was looking at doing swaps for my 94L for quite a while. For max torque the RS with a Turbo would be a beast (lots of dead trannies), the EJ22T would be cool but in order to get one it will be upward in miles, turboing the EJ18 you are a little quicker than an RS but I went ahead and did the EJ20T swap and am very happy with it. The whole project including purchase of the car has come to a wopping total of $6823 and many long nights!
Yes I said a turbo 1.8 is faster than a 2.5RS NA. I used my turbo kit without engine management and raced my friends RS before i swapped engines. But the EJ20 is deffinately the beast of the pack as far as feasibility and practicality goes. Not to mention the EJ18 if bored out to 83mm is the same block as the EJ20, just need the DOHC.
Well take it easy, Micah
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