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Old 07-16-2017, 05:32 PM   #1
TCX
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Default FB Swap Into 98 Impreza Coupe

Ok so probably a really dumb question
And I'm not super savy with FA/FB engines
So figured I'd just ask

Assuming I have a 98 2.2L Coupe
with a super dead engine
while gas mileage isn't that bad on it
an FA/FB gets quite a bit better MPG
Plus will be lower mileage than me trying to source another EJ22

Question is
physically is the bolting the same as an EJ
tranny, motor mounts etc

is it CANBUS like the later gen EZ30s, then swapping would be a nightmare even if you could physically do it
if not, then thats not too bad

it would literally be just for better MPG and reliability, not a performance boost at all

If you guys have other options to bump up to the mid 30's for MPG in my coupe I'm open to ideas, because I honestly love the thing and I'd like to keep it as my daily
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Old 07-26-2017, 01:04 AM   #2
91 RS RA
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I don't know much about the new motors myself so not sure if the mounts are the same, but you could make adapters.
But I think the main issue is that all the wiring/ecu will be different and would be a major mission to reloom. Not sure about gearbox either.
I think you need to go have a good look at one of the engines and compare it to the EJ.
I can always be done, its just how much it will cost to do.
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Old 07-26-2017, 09:53 AM   #3
TCX
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Quote:
Originally Posted by 91 RS RA View Post
I don't know much about the new motors myself so not sure if the mounts are the same, but you could make adapters.
But I think the main issue is that all the wiring/ecu will be different and would be a major mission to reloom. Not sure about gearbox either.
I think you need to go have a good look at one of the engines and compare it to the EJ.
I can always be done, its just how much it will cost to do.
I started looking into some things after this post
It is canbus, so the ecu would need to think it's whatever vehicle you take the ecu and engine out of

I was thinking the newer impreza or crosstrek
You can get a wrecked crosstrek with manual trans for not to much

Would get you all.the dash wiring, engine wiring. Engine, trans and cluster

Would just have to make mounts if they don't like up, a driveshaft, and custom axles for the front

Hopefully everything else id be able to salvage from the parts car
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Old 07-26-2017, 10:15 AM   #4
Stretch18
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DI conversion projects can be a nightmare. The ecu is far more advanced as it has to manage the injection cycles differently, but also handle hardware that doesn't exist in a port injection platform (like the cam driven fuel pump, etc.). Then figure out how to defeat the ecu's efforts to manage all of the emissions equipment that didn't exist in 98...

This isn't a subaru, obviously, but good example of a DI conversion that lead to a lot of headache chasing down computer issues:

http://www.caranddriver.com/features...n-mazdaspeed-5
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Old 07-29-2017, 07:16 PM   #5
Crawford Performance
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Quote:
Originally Posted by TCX View Post
I started looking into some things after this post
It is canbus, so the ecu would need to think it's whatever vehicle you take the ecu and engine out of

I was thinking the newer impreza or crosstrek
You can get a wrecked crosstrek with manual trans for not to much

Would get you all.the dash wiring, engine wiring. Engine, trans and cluster

Would just have to make mounts if they don't like up, a driveshaft, and custom axles for the front

Hopefully everything else id be able to salvage from the parts car
It can be done this way if you basically use every wire from the parts car including the wheel speed sensors. You will end up with a very nice ride when you are done
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Old 07-29-2017, 11:03 PM   #6
TCX
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Quote:
Originally Posted by Crawford Performance View Post
It can be done this way if you basically use every wire from the parts car including the wheel speed sensors. You will end up with a very nice ride when you are done
I didn't think about the wheel speed sensors lol I'll ave to figure that out as well
but in the end it'll be awesome i hope
widebody 98 impreza coupe
but gets 35+ mpg and is more reliable, as well as 6 speed
all while still looking amazing
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Old 07-30-2017, 12:29 AM   #7
Crawford Performance
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Quote:
Originally Posted by TCX View Post
I didn't think about the wheel speed sensors lol I'll ave to figure that out as well
but in the end it'll be awesome i hope
widebody 98 impreza coupe
but gets 35+ mpg and is more reliable, as well as 6 speed
all while still looking amazing
Yea, when we swapped a 2015 WRX into a 2014 Crosstrek body we got everything working but could not get a few of the lights to go off in the dash for the vehicle stability control. The issue ended up being the wheel speed sensors because we were too lazy to change them and did not realize that the different cars had different sensors even though they looked the same.
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