Why would you want to do that? The 1.8 injectors are too small for the 2.5 liter. That's why they are different...

[QUOTE=Kay95]how easy would it be to take the intake maniflod off a 1.8 and put it on a 2.5? also replacing the injectors of course[/QUOTE]
Wont work. The bolt patterns are completely different. The injectors dont even swap over.

[QUOTE=Kostamojen]The actual Swap...

There are a couple different routes you can take when swaping a 2.5 into an older Impreza. 1) Rewire the whole car using the 2.5 wiring/ECU/etc. from the doner car, 2) splice the ECU and engine harness from the 2.5 into the current wiring layout, or 3) run the motor with the existing ECU/wiring harness.

If you are doing this on a budget, the easiest thing to do is run the motor off of the existing ECU and Harness. I have a few examples of how to do so in detail.

The first scenario, a 93-96 swaping in a MY98 motor (This is Supermoose's swap)[/QUOTE]

so by this, i can drop in an EJ25, and not rewire it, and still have it run great, besides the 6k redline?

Yes, although it reportedly doesn't quite make stock EJ25 power. It's still a big improvement over the EJ18 though. :)

sti motor swap?
 

hey i emailed u about an wrx or sti motor swap. i dont think i gave u my email but its [email]jasonxiong@hotmail.com[/email] or if u would prefer just post your reply here. sorry by the way

This isn't really the thread for that. The Conversions, Transplants, and Swaps forum has a lot of info on motorswaps.

Phase II 2.5 in `01 Imp L wagon
 

Last week my 107,000 mile young 2.2 decided to eat a valve, and rip apart the head. Chunks came out in the header, and at least one intake valve isn't in place. I haven't pulled the head yet. Anyway, I'm having trouble finding a used 2.2, and a reman. costs as much or more than a 2.5. Can I just drop in a phase 2 2.5 in a phase 2 2.2 car plug it all together and go? Would I need to cut any wires? I really hurtin' to get this over with, they also tell me it will be two weeks to get the 2.2 to reman. and I'm trying to move half way across the country in about four weeks. They tell me the 2.5 is ready now. Any help would be great.
Thanks in advance.

Have any of you used a piggy-back computer on the 1.8 ECU with the 2.5 sohc? There are several mentions of running rich and fuel cutout @ high rpm.

How can you go from a SOHC ecu to a DOHC heads on the phase 2 engine with no problems?

Why would you want to?

Sorry what I meant is how can I go from a SOHC ej22 to a DOHC ej25 without problems? That is the first and "easiest" setup according to the post above. Dont the DOHC's cause problems with a SOHC ecu that would be for the EJ22? I may also want to put DOHC heads (phase 1) on a SOHC (phase 2) short block to up the comression to 11.5.1.

Just go with a SOHC EJ25. It's a better motor in every way anyways.

[QUOTE=keirnna]Sorry what I meant is how can I go from a SOHC ej22 to a DOHC ej25 without problems? That is the first and "easiest" setup according to the post above. Dont the DOHC's cause problems with a SOHC ecu that would be for the EJ22? I may also want to put DOHC heads (phase 1) on a SOHC (phase 2) short block to up the comression to 11.5.1.[/QUOTE]
Its easiest because the MY96-98 DOHC EJ25 is a phase one motor, and the wiring/ecu works best with other phase I motors. The SOHC EJ25's may be better motors in a few ways, but it just makes it more complicated if you are worried about such issues.

Stock the SOHC may be better, but with a little bit of work I think the DOHC is better. I want to do the easiest swap possible, so I'll go phase 1 if I can find an engine. Not to many people are selling theirs. What does the extra two cams do in the car? Since the SOHC only has 2 and by putting the DOHC long block in there it has 4.

How can you have DOHC with an ecu that is made for SOHC?