Hey guys, I did a conversion on a 93LS auto and put in 98 ej25 from a forester. I also converted auto to a stick, wheels, seats, clutch setup etc, all from a salvaged forester that I bought. Anyway, I used ej18 ecu. It runs ok, bogs a little on startup, runs a little rich, and has 6k redline.

What Im thinking to do is find a junker 93 legacy, take out the ecu for $50 and it should plug right in right? Wiring diagrams are identical. The reason I want to do it is 7000 redline, a little leaner, might not bog on startup?

Other option is doing a piggy back off of ebay for a $100 A/f only though, but I could get the mapping dead on. Your thoughts?

I think the ej18 is a 3 plug ecu, whereas the ej22 is a 4 plugger. I think it was supermoose that confirmed this. It's in a swap post somewhere.

The reason I want to do it is 7000 redline, a little leaner, might not bog on startup?
The Ej22s Redlines and bounces of the revlimiter at 6,500, besides max hp is 5,600 why would you want to go any higher then 6k anyway? I would also think your car is going to run similar with the legacy ecu in. The ecu is made for a 2.2 just like the 1.8 is made for a 1.8. If your going to go through the hassel look for a 2.5 outback our something mid 90's with a 2.5, and swap the ecu in.

Search the forum. There's a couple of threads on this. Again, I think it was supermoose, he had his ej18 ecu hacked to let it redline higher. I think it would also benifit from some sort of fuel control computer, like an safc or something. Just do some searching.

Actually, the EJ18 ECu is a great ECU for an EJ25 with upgraded cams because it runs more advanced timing maps. I drove one of these the other day and was quite impressed. It was an '03 EJ25 block w/DOHC '98 heads and HKS STi 272 degree cams and a bumped redline in a '93L. Worthless below 4500rpm, but once you hit that magic number it shoots straight to 7500rpms. Do a little more research and contemplating before you actually bail on that 1.8 ECU...