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Old 09-21-2003, 08:15 PM   #1
^jynx^
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Default ej18 to ej25 less rewireing if i.....

Use the ej25 ecu, and what about if i use a RS guage cluster? I asumeing buy using the RS ecu and RS cluster, just a few censors would need to be re wired?
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Old 09-22-2003, 03:43 PM   #2
Puckaveli
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If you use the bulkhead wiring harness from a EJ25 then it would require more cutting; if you use the harness from a 1.8 then it would require more. If you can get the instrument cluster wiring harness also it would help too. It's only 4-5 plugs a couple for the cluster, one for the hazards, one for the rear defroster, and one or two that plug into the bulkhead harness. Of course if you did the whole dash assembly you wouldn't have to cut anything if you had the ECU too.

I have never participated in a 1.8 to 2.5 swap so all of this info could be wrong of course.
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Old 09-23-2003, 12:01 PM   #3
Homemade WRX
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remember the L has a mechanical speedo coming straight from the tranny. The RS doesn't.
That would be a decent sized problem.
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Old 09-23-2003, 07:14 PM   #4
Hondaslayer
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Swap in the shortblock from the 2.5 and use the 1.8 heads and intake with early 2.5 injectors.No wiring needed!



PS it does work I have done 4 in early legacies.
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Old 09-23-2003, 10:33 PM   #5
Storm
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Quote:
Originally posted by hondaslayer
Swap in the shortblock from the 2.5 and use the 1.8 heads and intake with early 2.5 injectors.No wiring needed!



PS it does work I have done 4 in early legacies.
What is the compression ratio after doing this? I had thought of this awhile back to save time and money in my swap.

Jay Storm
96 L-RS
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Old 09-24-2003, 02:22 AM   #6
supermoose
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word. 4 of them? thats alot.


what head gasket did u use? head studs, etc? timing belt?

are there any of these franken-motors running aroudn? id love to see on, i pondered doing it myself bc of spare 1.8L heads at one time. u are at hodges rite?

h
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Old 09-24-2003, 10:17 PM   #7
Hondaslayer
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DOHC EJ25 gaskets
single cam timing belt
There are currently two at hodges,the third the guy quit and the fourth should be going in within the next two weeks.

BTW one is going to be boosted next week. 92 legacy,2.5 swap WRX wagon front bumper,MR-2 rear spoiler,STi scoop Painted brown (total sleeper) WRX suspension and wheels as well.

The guy drives it daily,pings if under 91 octane is used though. But hella fun! You can swing by if you want to see it.


Ben,
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Old 09-24-2003, 11:20 PM   #8
supermoose
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Default hodges

hmm. so hodges breeds frankensteins. rad. is your RSt at hodges everyday? can i just walk into the garage and poke at stuff?

i do it all the time at suburban (used to be sales there) but ive never been aroudn hodges, ive seen it at nite. its on woodward, waay far down rite? by liek 10 mile?

are u going to b in tomor? if so i might stop by

h
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Old 09-25-2003, 01:53 AM   #9
Hawk296
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HAHA Ive seen that legacy I had no idea! the bumper graft was kinda interesting. Whats the compression ratio with the 1.8 heads, seeing how I too have a spare set.. ?

yours the silver RS at pizza hut??
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Old 09-25-2003, 12:28 PM   #10
Hondaslayer
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Dont know what the compression is. But now that the legacy is fully smoothed over and painted it looks tight!
And yes that is my silver RS-t. i will be here until 9pm tonight. although i am busy as **** right now.maybe stop by next week???
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Old 09-25-2003, 04:43 PM   #11
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to get it back on topic jynx has made me a subaru addict and ive been searching for info on the ej25 swap into a impreza L

does anyone know where i can find a detailed list of things that need to be done or are needed? how bad will the wirring be if i have the ej25 harness and ecu? i saw someone post making it run on the ej18 ecu but id much rather run the ej25 ecu this will be my first major job but ima have a month or 2 to get it done so was hoping for any and all info all jynx has been able to tell me is it should drop right in and bolt up to the 1.8l tranny but thats all the info he can give me.. my questions are what clutch do i use? flywheel? uh trying to find wirring diagrams will prolly end up subscribing and dling like all of subarus fsms online i can get my hands on hehe. so any info would be much appreciated sry this was so long my first post and got so many things going threw my head haha
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Old 09-26-2003, 12:14 AM   #12
supermoose
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Default ej25 swap.

hey- look up my name, youll find my riteup. if u run a 4.11 trans, theres no reason to need a redline above 6K.

h
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Old 09-26-2003, 03:38 PM   #13
Hawk296
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you can use a 2.5 flywheel and clutch or 1.8 if thats all you have. You CAN use a 2.5liter clutch and flywheel with your existing cable setup. Both myself and supermoose have written up everything needed to do a swap using the existing 1.8 ECU. He did the DOHC and I did the SOHC.
It will be a significant amount of work more to do useing the 2.5 ECU. Wiring will be pretty much like what all the guys doing EJ20 swaps are. Im assuming your going OBDI- OBDII? The 2.5 ECU will give you a slightly higher rev limit for the 2.5 adn will run alittle nicer with probably more power cause the 1.8 ecu runs alittle rich. You also have knock sensing with the 2.5 ECU and it will run alittle more agressive spark. but it will take a considerable amount of work and time to sort out the wiring. As far as details on the wiring i'll let someone else answer that....

good luck and have fun!
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