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Old 10-18-2010, 09:14 PM   #1
Erus
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Default EJ18 in to 97 Lego GT, ECU Questions

So I want to put my 1.8 from my 97 Impreza into my 97 LGT, and the 2.5 into the impreza.

Is it possible to swap the motors and have the ECU's reprogrammed. Or should I just swap the ECU's with the motor? Also, anyone see any other issues?

*****For the record, lol, the LGT is auto and has no balls to begin with so please don't tell me how dumb of an idea this is. Its my DD and is already slow so I don't care. The head gaskets need to be done anyways.

I was thinking I could just pull the 1.8 and put it in the LGT. ECU stuff? Questions + NASIOC = ...answers!
Then I could take my time and do the head gaskets (not the first time I've done this to a lego ) and then put it in my GC.

The impreza is a manual and the tranny works flawlessly. It has been gutted and is slowly being turned into an auto-x machine. Has WRX suspension all around, just thought it could use a little more power. Don't wanna turbo it.... yet...
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Old 10-18-2010, 09:24 PM   #2
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The 1.8 ecu will run the 2.5 ok. You may need to get a 2.2 intake manifold complete with sensors and wiring to put on the 1.8, some of the older 1.8's used a different setup.
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Old 10-18-2010, 09:30 PM   #3
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Ok cool.

So the 2.2 intake will bolt right on, and provide all the necessary sensors for the 2.5?

Also, you mentioned the 1.8's changing. When did this happen? Both are 97's. Will that make a difference. Like, can I get by without getting the 2.2 intake man? What will happen if I don't?
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Old 10-18-2010, 10:14 PM   #4
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At least find a phase 1 2.2 instead of the 1.8...
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Old 10-18-2010, 10:22 PM   #5
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ha ha...

I am downgrading an already neutered car, so I really could care less about running the 1.8 v the 2.2.

I don't really wanna spend any more money on an engine that may need work. I just did the timing belt, head gaskets and other stuff on the 1.8. Its good to plug and play
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Old 10-18-2010, 11:26 PM   #6
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Quote:
Originally Posted by Erus View Post
Ok cool.

So the 2.2 intake will bolt right on, and provide all the necessary sensors for the 2.5?

Also, you mentioned the 1.8's changing. When did this happen? Both are 97's. Will that make a difference. Like, can I get by without getting the 2.2 intake man? What will happen if I don't?
Right get a 95-98 EJ22 intake manifold with all the sensors and wiring and it will be a bolt in, plug in swap.

I'm not sure on the 1.8, see if yours has 2 or 3 plugs for the engine harness to body harness. I think it will be 2 on the 1.8 and 3 on the LGT. See if the 1.8 has the IAC on the throttle body or on the intake.
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Old 10-19-2010, 07:40 AM   #7
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What does the IAC look like? What am I looking for? (On either)

And where is the engine harness to body harness located on either?

Thanks. Im gonna go poke around and see what I find.
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Old 10-19-2010, 08:40 AM   #8
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Both IACs use the same plug and operate the same way. Shouldn't be an issue.

Only issues I see would the be the EGR on the EJ25 not having the necessary wires running back to the ECU plug (which is also the same). They will swap out, but you may likely have a CEL for the EGR on the Legacy.

Jay
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Old 10-19-2010, 08:46 AM   #9
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I think the old 1.8 had a pintle style IAC on the throttle body and the 2.5 has a vane style on the intake manifold. The TPS is different too. I also think all 1.8's have egr.

Since you have both cars there just compare side by side.
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Old 10-19-2010, 09:42 AM   #10
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Ok. I am gonna put the cars side by side and take two pictures and post them and if you could maybe use Paint to circle things I need to look for and stuff of that nature... that would be pretty cool.

Cause I have no idea what most of the things you described are, or what they do.
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Old 10-19-2010, 04:02 PM   #11
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With that in mind, this may not be something you want to start by yourself.

At least grab the wiring diagrams so you can see what exactly is different and how to make it work. I fogot about the TPS plug, but the function is still the same, so splicing can be done to change the plug end to suit your setup. Same with the IAC (Idle Air Control[valve]). Both are 3 wire, one is on the TB the other is on the manifold, both take an open and close signal with a common....

Jay
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Old 10-19-2010, 05:03 PM   #12
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I won't be attempting this by myself. Plus, I like challenges and learning new things, even if it means trial by fire
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Old 10-19-2010, 05:56 PM   #13
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Quote:
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I won't be attempting this by myself. Plus, I like challenges and learning new things, even if it means trial by fire
You're good. Both of the swaps you are trying to do have been done successfully in the past by others. You'll figure it all out. Especially having both complete cars right there.
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Old 10-19-2010, 07:14 PM   #14
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Cool. Well... I am sure I will run into issues and post a bunch of questions in this thread.

You said it has been done before. Do you have any threads that may be of use, on NASIOC or otherwise?
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Old 10-19-2010, 07:36 PM   #15
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Just an idea.

Source Ej22 heads, intake manifold and bolt it on the EJ18 block to make a high compression franken motor?
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Old 10-19-2010, 10:16 PM   #16
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Possible project for the future...

I don't wanna spend any money on another motor. But if I ever come across one, I may pick it up.
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Old 10-20-2010, 02:13 AM   #17
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How about sell the legacy, spend $100-150 on a 2.2 longblock and put that in the Impreza instead of wasting all that time doing something you will regret.
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Old 10-20-2010, 03:21 AM   #18
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Quote:
Originally Posted by bangedlegacywagon97 View Post
Just an idea.

Source Ej22 heads, intake manifold and bolt it on the EJ18 block to make a high compression franken motor?
EJ18 and EJ22 heads are both crap, bolting them to the EJ18 will make no difference at all.

Bolting them onto an EJ25 is what makes a high comp franken motor.
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Old 10-20-2010, 08:15 AM   #19
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Quote:
Originally Posted by Kostamojen View Post
How about sell the legacy, spend $100-150 on a 2.2 longblock and put that in the Impreza instead of wasting all that time doing something you will regret.
Well for one, I need to keep the legacy for a daily driver cause the impreza is undergoing modification that will keep it off the road for a little while.
Two, so if I got a 2.2 long block, which heads would I put on it? Or keep stock?
Three, like I said before. I have both motors side by side, everything accounted for.

I like your ideas but, I just wanna work with what I have.
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Old 10-20-2010, 08:23 AM   #20
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Quote:
Originally Posted by Hondaslayer View Post
EJ18 and EJ22 heads are both crap, bolting them to the EJ18 will make no difference at all.

Bolting them onto an EJ25 is what makes a high comp franken motor.
Do you know of any threads that detail this build? I kinda like the idea of a high comp franken motor. So, with that said, if I were to do this, would you recommend using the 1.8 heads, or acquiring some 2.2's? Also, which head gaskets would you use? The redesigned 2.5's or the 2.2/1.8's?

Would that speed up the deterioration of the headgaskets? Or are the redesigned ones pretty much a permanent fix?

Lots of ideas, gonna consider them all...
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Old 10-20-2010, 08:51 AM   #21
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The new headgaskets from the dealer are a permanent fix.

Your reasoning for swapping the engines makes sense to me. I'm clueless as to why others think it's a bad idea or you'll regret it.
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Old 10-20-2010, 10:06 AM   #22
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Yea, for now, I am just going to swap them and drive the lego. I can fuss with a frankenmotor later.

Ok, so recap:

In the Lego: 2.5 ECU, 2.2 Intake, 1.8 Block. Is that correct?

In the GC: 1.8 ECU, 2.5 complete motor. Is that correct

Does it make a difference that the Lego is auto and the GC is manual?

Also, will I need to mess with or swap the radiators?

And lastly, back to the frankenmotor: If I put 2.2 heads on the 2.5 block, would I use the 2.5 or 2.2 gaskets?

Thanks for all help so far!

Also, the 1.8 and 2.2 heads have one exhaust port and the 2.5 has two, right? So... swap headers... exhaust?
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Old 10-20-2010, 10:15 AM   #23
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You have it about right, just adjust your plans as you go if you find minor differences.

Manual vs auto doesn't matter, just switch the flywheel and flexplate.

Radiators stay in the car it came from.

1.8 and 2.5 are both dual port.
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Old 10-20-2010, 11:25 AM   #24
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Sounds good. I will try and get pictures of the engine bay up today after work.

But... I also want to switch the transmissions and driveline. Is this doable? Will I need to cut the driveshaft or do I need a new one? Should I just start a new thread for this?
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Old 10-20-2010, 01:19 PM   #25
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Putting the 5 speed in the auto car isn't that bad. You have to splice 4 or 5 wires.

Putting the auto in the 5 speed car is a lot harder. You really need the whole chassis harness with all the wiring for the tcm. If you were REALLY ambitious, you might be able to cut the tcm wiring out of the other car and move it over, but it is going to be huge pita.

Legacy and impreza have different driveshaft lengths and the 5 speed and auto use different shaft. So you'd need the right shaft for each car. You'd also need to swap the rear diffs if the ratios don't match.
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