93 Impreza w/ EJ22T engine control options

[doormat]

I just picked up an EJ22t w/ 89k for $800 from a junk yard here in Michigan. I got everything, engine, turbo, downpipe, ECU, wiring harness, radiator, crossmember, MAF and MAP, fuel pump, even the wheels. Anyway, the plan is to put it in my OBDI Impreza L AWD 5sp. but i'm unsure as to what the most logical approach is to tackle the engine management problem with.

It seems the most complete and proper way would be to completely rewire the car with the Legacy harness. I read somewhere on this forum that someone was doing this. Although that seems a little tedious and may not be the most efficient way.

Another option seems to be to modify the impreza's harness to accept the turbo ECU and and the new sonsors.

Another option seems to be a piggyback system somehow used with the impreza'a current control sys.

Or just a complete aftermarket engine management system

Another thought i had, which is probably a bad idea, but maybe not. is to just use the stock ej18 na ECU swap in the engine forget about the MAP sensor and just run a MBC and some sort of crude fuel management to support the turbo until i can afford a nice aftermarket unit.

So are these all my option? And what is most logical? most efficient? Thanks for reading

[azn2nr]

use the imprezza's chassis harness and use the motor harness from the legacy. you need the map sensor for the car to run right. and use the legacy ecu. use the imprezzas 5 spd if you wernt going to already and replace the flywhell and clutch with exedy components.

for now there arent any many if any standalone options for this motor. just be sure to use the legacy ecu. also consult the conversions forum at nasioc for wiring help on this venture as many of them have done this swap

[doormat]

thanks Jason, that makes a lot of sence now. but doesn't the leagacy's engine and chassis harness's come all intertwined and taped together. or is it a straight foreward task to just seperate the two once it's out of the car?

later i still have to go back to the junk yard when it gets a little warmer to try and wrestle the huge harness out of the legacy. So if i ask those guys at nasioc they should be able to tell me what parts to get?

thanks again

[NICO]

i am all most done this swap in a 95 impreza sedan L.

how me and my dad did it was i owned a couple of legacy turbos so i had 3 times the extra parts. we striped the in side of the impreza and put the main ecu from the turbo legacy in, the only thing was wirring up the dash. the conectors where both males so it took a little work.

then i droped the rear strut sub frame link that holds the diff, and bolted up the legacy turbo vent disc, plus swaybar sub frame link up, and that was done. next is the motor and 5speed tranny that is a pice off cake the next hard thing is the intercooler i get that in and i am 800lbs light weight chapion of the world you can call me ROCKY.

good luck

[doormat]

wow that sounds like a lot of head ache - isn't there a more simple way?

it would still be helpful to know exactly why i can't use an NA 1.8 control system. I understand that the Legacy computer requires a MAP signal but the NA computer doesn't -so isn't it flexible enough to just take the MAF's new signal that there's like twice as much air coming in than before? i don't know? i wouldn't want to try it if it hasn't been done before.

Also would the Link ECU work -thats a popular aftermarket unit for subarus right?

thanks

[vrg3]

What year is your Impreza, doormat?

[NICO]

lets put it this way my dad is crazy, that car is so put togther that in fuji subaru they would think it came like that. you can do it perfect insane like my dad did so we have noproblems in 5 years, or you can do a half ass job and 1 year and you have problems.

[doormat]

its a 93 with the 1.8

[doormat]

vrg3, i read your post here http://forums.nasioc.com/forums/sho...ight=ej22T+ej22

about the guy running the engine with his OBDII ECU in a 95 legacy, which you said ran poorly. But might my OBDI ecu be a better match than that? Also if you can recall what caused it to run so poorly.

[vrg3]

That link's broken...

Stock non-turbo ECUs won't run turbo engines well because they're the wrong ECU. There's no reason to expect them not to work poorly, is there?

I think the way to go would be to patch the EJ22T ECU in place of your stock ECU. I think for the most part you'd be able to just rearrange pins in the connectors... You'd have to add one connector and run a few more wires between the engine bay and ECU, but it wouldn't be that bad.

I can get you info on what exactly you'd need to do if you like.

[NICO]

no my car is a 95 impreza sedan L and its white its going to be the best sti knock off, this one will for sure make it in to subie sports the car is mint.

[hackish]

I think first you have to identify what you're looking for in this car. If it's just meant to be a close-to-stock EJ22 turbo then by all means go with the standard ECU. I think you may find that the wiring is pretty similar. I know from a '99 STi to a '00RS the wiring was pretty darn close. From a 96 STi to a 00RS not so. From a 93 L to a 00RS not at all. I suspect a 93 legacy to 93 L should be pretty close...

If you're looking to put a FMIC, upgraded turbo, upgraded injectors etc. then you may want to go standalone. If you do all the install yourself then it isn't that expensive. If you're not experienced in tuning engines then you should expect to pay about $500-$1000 to have it tuned correctly by a professional.

-Michael

[doormat]

Thanks guys, the stand-alone engine management is probably something i should do later when i have a more funds.

vrg3,

to patch the ej22t's connector and ecu sounds like the most efficient way so far. there wouldn't be the need to rewire the entire front of the car, just rearrange some pins and add a few wires right? So to be clear, your saying that the only parts i should use from the Legacy are the ECU, its connector, and the additional wires for MAP, pressure exchange, and wastegate? That seems pretty easy.. I have ECU pin-outs for the EJ18's ECU as well as the EJ22t's pinouts from one of your posts earlier, but if there is additional information about exactly what i need to do, i would greatly appreciate it thank you.

[vrg3]

You'd probably be rearranging a lot of pins, but yes, you have the rest of it right.

I believe the three connectors on your ECU are actually the same as three of the four connectors on ours'. So you'd actually mostly just be shuffling around the pins that are already in your car; the ECU harness connectors' contacts are designed to be removable so you can easily release them and reinstall them elsewhere.

You'd splice in that fourth connector, and just run a few more wires out to the engine bay. Aside from the MAP sensor, pressure exchange solenoid, and wastegate solenoid, you might also need to do something with the TPS and maybe run a new shielded wire for the knock sensor.

You would also transfer the engine wiring harness from your stock motor onto the Legacy motor. I think you'd use the Impreza's cam and crank sensor pickups since their harness works differently from the Legacy's.

If you already have the complete pinouts then you should be able to figure out what it is you need to do. After you get going you'll probably have some questions to ask.