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Old 07-10-2003, 12:21 AM   #1
C17LOAD
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Default Potential Problems when swapping for EJ25T from new XT

Anybody know of any potential problems that might be run into? Aside from the fact that they're probably hard to find right now...
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Old 07-10-2003, 11:21 AM   #2
Jaxx
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if you do
get the whole car ...
you will need wacky things like fuel pump relays and electronic throttle pedels

still relitivly uncharted teratory
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Old 07-10-2003, 01:30 PM   #3
Keshav
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oh dear, that electronic throttle is going to be a bugbear, ain't it?

I'm sure there are a ton of us thinking about this swap and waiting for someone to source the engines and make all the mistakes before we comit our hard-earned cash.

This engine is very attractive for the fact that it should fall between a WRX engine and a JDM STI engine in price. There are a number interesting details about what they've designed into this engine that came out in that C&D article.

This swap won't be simple, but it should be a helluva nice engine in a light GC8 body!
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Old 07-10-2003, 04:19 PM   #4
compfool
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Question

From what I read about the whole 'drive by wire' deal was that is just a sensor at the pedal and a little electric motor at the throttle body. I am sure there are backup devices in place and all that BUT couldn't you just remove the Drive by Wire and install a real cable in its place. Or does the Drive by Wire send its signal to a computer like ECU then out to the Throttle Body.

Then again I could be completly wrong about how the Drive by wire works. Wouldn't be the first time and I know it won't be the last.
-=Adam=-
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Old 07-10-2003, 05:58 PM   #5
stimpy
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Unlike Audi, I believe that Subaru has just implemented this as an electronic drive-by-wire and NOT as a means to control ultimate power or traction control. However, I am not in any position to say whether or not the ECU reads this or expects something that could not be given from a throttle cable and a TPS.

There was a thread about the STi done by AZScoobie I believe. You might want to look into it. My bets are that the ECU is going to want the electronic throttle.

Beyond the new throttle assembly, the rest of the parts needed should be just like the WRX.

-Jon
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Old 07-11-2003, 02:48 AM   #6
Kostamojen
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You might be able to just use the throttle body from whatever car you are swaping it into.
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Old 07-14-2003, 12:24 PM   #7
Jaxx
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Quote:
I am sure there are backup devices in place and all that BUT couldn't you just remove the Drive by Wire and install a real cable in its place. Or does the Drive by Wire send its signal to a computer like ECU then out to the Throttle Body.
first there is no back up
there is no mounting point for the cables on the manafold
unless your going with some sort of stand alone you are going to have to use the throtle by wire setup

i think it is an absoulty great engine for a swap .. the only things that seem diffent from the STI engine are the injectors and turbo..
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Old 07-14-2003, 02:29 PM   #8
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Couldn't you just run the drive-by-wire in whatever you were doing the swap into? Just be sure to get the ECU with the motor.
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Old 07-15-2003, 11:58 AM   #9
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Quote:
Originally posted by Jaxx


i think it is an absoulty great engine for a swap .. the only things that seem diffent from the STI engine are the injectors and turbo..

the STi also has larger cams(AVSC) and a larger intercooler, other than that, they are the exact same motor
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Old 07-15-2003, 04:13 PM   #10
RebelINS
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I geuss great minds think alike, because as soon as I read that article I was thinking about putting the engine in my car! I was going online right now to see if anyone posted about the swap idea.

Since the Forester doesn't have the same performance following as the STi I was thinking that the engine will be cheaper to source eventually.

Will an RS manifold fit on the Forester engine? Because if the drive by wire system causes complications maybe it would be easier to use an RS manifold with a stand alone. I don't know much about drive by wire though, so if anyone knows about please share the info.

-Wes
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Old 07-15-2003, 05:49 PM   #11
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No, the RS manifold will not. Atleast, it won't on the WRX heads. The throttle body, on the RS and WRX, will unbolt from the manifold so you shouldn't have to change that. It wouldn't make sense to make the entire manifold and throttle body as one piece.

I don't know about the short blocks, but a lot of people say they are the same. I find that odd but it is possible I guess. The specifications I was looking at indicated that the STi was semi-closed while there was no mention of the Forester XT block being the same. Some of the new STis in Japan are coming with an interesting type of aluminum pistons. I don't know if this made it into our STi or not. Honestly, I can't remember reading much of anything from anybody who has had the block apart.

Heads should also vary more than just AVCS and cams. Again, I don't know if our STi got all the exotic stuff that the JDMs got but it wouldn't make sense to see that type of stuff in the Forester.

-Jon
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Old 07-15-2003, 06:26 PM   #12
Jaxx
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after learing the hard way

do a compelte swap
engine mangament is the most important part..

if i had to do it again i would swap the whole thing (i mean everything, dashboard and all) then mod

on that note a forester dash should be a direct bolt in ...
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Old 07-16-2003, 12:45 PM   #13
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Does anyone know if the XT's motor will mount to the GC8 mounting points? My only concern with the idea of this swap is that the Forester and Impreza are 2 different frames (for the most part). The mounting points may be different, but I haven't been able to crawl underneath one to take a look.

The dealership may just escort me out of the place if I try that.
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Old 07-16-2003, 12:53 PM   #14
stimpy
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See the FAQ and threads of note.

The Forester shares the same chassis as the Impreza. An EJ series motor will motor to the same mounting points as any other EJ series motor. However, the crossmember would need to be changed to accomodate the up-pipe.

-Jon
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Old 07-16-2003, 09:38 PM   #15
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Thanks. I don't know why I thought differently. I'll have to check that out. Gotta start planning for the dumping of this engine (or build up to turbo) and inplant of something new.

AJ
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