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Old 02-18-2002, 09:19 AM   #1
bobjr94
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85 wrb BRAT

Default for anyone looking into a 1.8-2.5 swap

For anyone that has gotten a impreza with a 1.8, or 2.2 for that matter and wants a quick swap..I put a pahse 2 2.5(my99) in my 96 impreza 1.8 two days ago..about 150 miles and no trouble and no engine light and only a little over 1/4 tank of gas..

Even though it had a 8 bolt bellhousing , it bolt right up to the older 4 bolt housing..The exhaust(though small on a 1.8) bolts up...
youll need to take the throttle body off the 1.8, cut out a piece of steel to match the gasket on the 2.5(bolt holes and center hole only), put the gasket from the 1.8 on the throttle body, the steel shim then the gasket from the 2.5 on the back and bolt it on..

on a phase 2 motor, the injector plugs are different, you cut each off and splice to your old 1.8 harness...youll also need the coil pack from the 1.8...it will also need and adapter to match up the bolt holes, or just put 1 bolt in and it will sit kinda of sideways, but works for the time being...

the clutch was stiffer now, but I have the hydraulic setup from the doner car anyway..the clutch cable may not last long with the extra force on it..

youll also have to change boots on the plug wires...

the car of course has much more power, even with the smaller exhaust..since the 1.8 had no knock sensor the ignition timing may be less aggressive than a stock 2.5, so power will be slightly less than the 167...

ill get some pictures on my web page in a day or 2..
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Old 02-18-2002, 10:09 AM   #2
Tkacik
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Wow, great info. I am looking to do this swap in the future also. Thanks.
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Old 02-18-2002, 02:12 PM   #3
RaceCarRiot
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silver

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definitely good info. keep us posted on the progress of the site. i was considering doing this myself, until the wiring/engine management issue became a problem...if i have to go out and buy a standalone system, might as well go all out and go forced induction.

so basically it IS running off a 1.8 ECU?

the ignition timing shouldn't be a problem, provided you let the engine warm up to temperature before driving the car hard. a friend of mine is running a 2.2 off the 1.8 ECU, and has no problems with knocking as long as the car is warmed up.

-adam-
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Old 02-18-2002, 11:32 PM   #4
DoinkMobb
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How much was the engine? Did you do the entire swap yourself?
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Old 02-18-2002, 11:41 PM   #5
bobjr94
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I bought a wrecked and mostly striped 99rs for 800$..its missing all the interiour , wheels,struts,half the windows,front bumper,front brakes,air bags, computers, most the exhaust, etc..

since it was missing the computer and the wiring was hacked i bought it untested, the motor could have been bad..but i got a good motor,trans,rear disk brake set up and rear bumper and some small things...

and yes, i did the whole thing..in one night..drove it into the shop about 5 in the afternoon, and had it running by midnight...plus going for take out and spending an hour playing with a camera i bought a few hours before..
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Old 02-19-2002, 12:19 AM   #6
EvasionOfTruth
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Man I wish I lived in WA, I'd be your best friend. I'm thinking about a 2.5 in mine also.

Buster
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Old 02-19-2002, 12:24 AM   #7
DoinkMobb
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Ah, I see your occupation is mechanic. So that's why you can do things like engine swaps in your spare time. Neat.
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Old 02-19-2002, 04:02 AM   #8
Kostamojen
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Damn, you should have weighed your car before and after I was curious to see what weight difference if any there would be...
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Old 02-19-2002, 04:54 AM   #9
XT6Wagon
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Why would they wieght any different? Both are the same motor, with only "minor" changes through the years. I'd put money down, that there is less than a 10lbs difference at MOST.
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Old 02-19-2002, 07:55 AM   #10
ImprezaTs
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Sorry for the OT but anybody wants to do the swap from 2.5 to 2.0T? Or knows how to?
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Old 02-19-2002, 08:51 AM   #11
bobjr94
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Well thats next...i wanted the phase 2 block because its gonna have a turbo at some time...when i get all the parts its comming back out, a set of 8:1 compression pistions is going back in with some other things....

but for now, i have a basic overview up on my web page, with better picutres to follow later....3 days now, no engine light..starts right up, hot or cold and mileage seems the same as the 1.8..i think it was only rated 1 mpg less...

http://www.fakewrx.com/car4a.htm
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Old 02-19-2002, 03:02 PM   #12
Hawk296
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so stock1.8 ECU and all, jsut 2.5 clutch? yo have to ue hydauli or will cable work with it? this is pretty cool news. hold me over till i get the rest of my 2.0L parts, and stop that oil leak ive got in my 1.8.
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Old 02-19-2002, 10:13 PM   #13
ImprezaTs
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Hawk296: pmed you with questions
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Old 02-20-2002, 03:18 AM   #14
Kostamojen
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Quote:
Originally posted by XT6Wagon
Why would they wieght any different? Both are the same motor, with only "minor" changes through the years. I'd put money down, that there is less than a 10lbs difference at MOST.
Thats what I want to know for sure! Exept, there might be a tad more weight from the hydro clutch as well... But if the block is about the same weight between the 2.5 and the 1.8, it might be interesting to see how light you could get an L with the 2.5 and make an ultra-light AWD track car out of it (my dream on-the-side for my car eventually)
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Old 02-20-2002, 03:46 AM   #15
XT6Wagon
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If you want a lightwieght AWD racecar, might want to start with a Subaru hatch. Its the smallest of the 80's Subarus and is a shade over 2100lbs stock. The EJ drivetrain should only add 50-100lbs, which you likely could take back off if you wanted to by changing the rear suspension to a light wieght design. Whats back there currently is heavy because it was expected that *someone* would drag it across rocks on a semi-regular basis. Of course thats $$, but its far cheaper than trying to get an impreza near the 2K lbs stripped mark.
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Old 04-26-2009, 09:33 PM   #16
trevitino
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I wish i had a legit shop to work in i've spent too many hours doing a rear end swap.
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