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Old 12-12-2003, 05:21 PM   #1
ninjaMike
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Default 1.8 L project

Good day!
I have enherited my wife's 1993 stock 1.8 L impreza. Nice car, but a little under powered for me. I am also used to working on my '65 Mustang, so imports are a new, and interesting challenge. What I would like to find is a resource for what parts will fit on a 1.8 L block. I would like to put an aftermarket exhaust and change the intake, but there is very little info about the 1.8 (understandibly). Any other info on adding at least a little extra hp to this car would be appreciated.
Thanks!
Michael
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Old 12-12-2003, 08:42 PM   #2
Nicklbrso
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I have the exact same car you do. I love it but agree that it is under powered. The engine mods so far I have done are cold air intake, and 5Zigen axleback exhaust. I plan on a custom cat back this spring. A few guys have turboed their EJ18s, and many ppl have swapped out the EJ18 for the EJ25(2.5 RS engine). I have been looking for an EJ25 engine myself but have not been able to find one.

Heres a good thread on the EJ18 EJ25 swap by supermoose.

http://forums.nasioc.com/forums/show...highlight=narg
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Old 12-12-2003, 10:22 PM   #3
scobaru
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one of the simplest swaps would prob be 2.5 in the old gc body style since your able to use a lot of the 1.8 stuff. it really depends how far you want to go with your project how much hp are you looking for? what do u want to use the car for autoX drag racing street driving? is it AWD? do a search on these forms on what you want to find out a lot of questions that you have. prob have been covered. read the FAQ part of this converison form a lot of info. as far as what works with the 1.8 any header made for the 2.5 or duel port exhaust from a 2.2 will work also 2.2 single port exhaust came out in 97 and up for the 2.2 you wont be able to use that any intake system made for the pre 97 impreza will work for your subie. not a lot of people modify the 1.8 some do see potenal in them and will bolt DOHC heads from a 98 2.5 motor and turbo charge wile others will build up n/a 2.5's or swap out the 1.8 for a turbo 2.0 liter motor witch a stock jdm motor from lets say 97 wrx sti will produce 280hp stock
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Old 12-13-2003, 12:30 PM   #4
ninjaMike
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Thanks for the info. This should be a fairly simple and low cost project, I won't be swaping engines, but a new exhaust will definately be going on, as well as a new intake.
I only plan on driving it for my daily driver so I am not looking for quarter miles results, just a little more power for the on-ramps.
Michael
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Old 12-13-2003, 10:52 PM   #5
Kostamojen
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First thing you need to do is take off the intake silencer that is in the fender well. Then maybe a lightweight or underdrive pulley. Out of everything ive done with my 1.8, including headers/catback those are the two have have done the most for the car power wise.

Im doing a turbo kit though soon, cause other than either an engine swap or some sort of turbo type kit, you will just not be able to get decent power out of this motor for onramps or hills or anything else like that
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Old 12-14-2003, 01:44 AM   #6
scobaru
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as far as the project goes do u want any looks for the car pretty much anything from 93-01 will bolt up to your car 2.5 rs front end to jdm verison 4 bumper
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Old 12-15-2003, 08:16 PM   #7
xxtwowheelfiendxx
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93-L here as well. My car was free and when i get out of school i plan on dumping about 10-15k into it to make it an UBER sleeper. 6k for a total STi Suspension Upgrade. 4500$ for a USDM EJ-20T motor and prob a new 5-speed. Then wheels and tires etc. it should be nifty

as far as the 1.8 liter goes i havent been able to find crap for it
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Old 12-15-2003, 10:22 PM   #8
scoobyimprza
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The EJ18 has lots of potential. Believe me
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Old 12-15-2003, 11:25 PM   #9
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I had a 94 L and well it now is a 94 Impreza with an 02 WRX engine ...my mid thirteen second car
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Old 12-15-2003, 11:27 PM   #10
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the only performance part I can't find for it other than valves are the piston heads.....you can bolt a turbo kit up to it just fine though
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Old 12-15-2003, 11:33 PM   #11
scobaru
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a cheap thing u could do with lots of power is used usdm header from a wrx a turbo prob from a wrx some injectors fuel pump maybe some type of mangenment and your good to go

modifcations are addictiveonce u think the car is fast enough you'll wanna go faster
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Old 12-15-2003, 11:48 PM   #12
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no don't do what he said..to use the headers you have to change the crossmember...that requires pulling the motor...just buy subachads up and downpipes along with a stock WRX intercooler and turbo...a walbro fuel pump for a 240SX off of ebay...silvia injectors and a air fuel controller and you are turbo charged

the pipes will probably be the most expesive part ...all these parts are cheap on ebay
the fuel pump $85
turbo $100-150
intercooler $100-150
injectors......???
pipes...I think $425 for the set..... www.uniquemotorsports.com
oh yeah a hood from a RS or outback sport or in Canada the WRX...check junkyards
air fuel controoler...up to you
boost gauge $20 on ebay
BOV $20 used
what am I missing?????
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Old 12-16-2003, 12:00 AM   #13
scobaru
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oh yah forgot about the down pipe and X memeber
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Old 12-16-2003, 08:59 AM   #14
scoobyimprza
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I didn't pull my engine when I put in the crossmember, I just disconnected the engine mounts and jacked it up and out above the crossmember.

Gaskets $150
Hoses
Clamps
T Fittings
Possibly a WRX waterpump
Custom Intake
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Old 12-16-2003, 01:28 PM   #15
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eh...just weigh the amounts and work having to be done by both setups...that is if you decide to go turbo...all I know is that the WRX way takes more parts....i.e. waterpump, crossmember
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Old 12-16-2003, 02:23 PM   #16
ninjaMike
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Wow, lots of stuff to do. I think the 1.8 does have potential. I am also glad you guys suggested the rs, or WRX hood. I was planing on scouring the junkyards for one and bolting it on, with a new intake. This has really been a great help. I plan on checking here often and keep you informed. I just finished reaparing the axel and new wheel bearings on the driver side, so it's all jacked up and ready to mod.
Later
michael
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Old 12-16-2003, 11:47 PM   #17
supermoose
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if you want a hoodscoop (older style JDM 93-96 one) to fit on your existing hood or use for the ultra rare 93-96 STI hood, i got one. ill even deliver it to toronto!!! (might be headed there next week or so)

its designed for the 93-96 impreza, i happen to have a spare.
looks like this:

http://spdusa.com/meet_the_spd_wrx.htm

hit me a PM if u are intersted. be glad to hook u up and show u my impreza when i am in T.O.

h
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Old 12-17-2003, 01:41 AM   #18
scobaru
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old sizzle is off the hizzle of umm shilzle?

I'd take up supermooses offer but if u don't a 98-00 2.5RS or outback sport hood will work for your car the lines on't be perfect but i'll fit and look pretty good if u want it all to work then 97+headlights and grill you'd need for it all to be flush
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Old 12-17-2003, 02:55 AM   #19
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yar. i spent the $$$$$ and did the sti v5/6 front end conversion. come to think of it, if id had gotten the chance, i woulda done the old skool. so much rarer, and no-one would be confuzzling u with a 2.5RS :P. cheaper too. dotn have to swap out headlights and grill. the headlights are IMPOSSIBLE to get your hands on, and $$$ too. the grill i dont really like the look of. the hood isnt bad, but i really like the old skool hood, my buddy has one on his car (with his EJ20G :P) and i r want it!!!!!


h
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