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Old 08-08-2005, 04:30 PM   #1
gavinjay
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Default 91 legacy turbo block questions

hi there,

im kind of a newb in this field, but im looking to swap my 2000 2.5rs.
my dad has a 91 legacy turbo and i think he will be retiring the car soon.
its got some high milage... particularly 300,000kms.

however, would i be able to run that block in my car with my tranny/heads?

I was leaning towards a wrx swap but this seems like a much cheaper solution.

what more would i need to make the swap work?
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Old 08-08-2005, 09:40 PM   #2
Legacy777
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AWD 6MT EJ22T AWIC Swap

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The block will mate up to your tranny & heads. you will need to run your intake manifold.

Are you planning to keep it turbo'd, or are you just wanting to use the block?

There's some talk in the engine forum on www.bbs.legacycentral.org about swapping heads over from the RS's. It will lower the compression ratio, however they will flow better.

So depending on what you're doing or what you want.....will depend on what is "best"
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Old 08-09-2005, 08:43 AM   #3
gavinjay
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no i wanna boost it...

will the whole valve terrain from my rs work? and my differentials and such? brakes? headers?

and what do you mean by "run" my imf?
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Old 08-09-2005, 12:59 PM   #4
Legacy777
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You'll run into issues with engine management. Your car is OBD2, and must stay OBD2. However, without a piggyback computer, your stock ECU won't be able to handle the turbo.

Not sure what you mean by "will the whole valve train work" All you'd do is take the heads off, put them on the ej22t block. Timing belt and all that crap is fine.

differentials & brakes have zero bearing on the engine. You will need to use turbo specific exhaust, and the front crossmember will need to be swapped over as well.

The port size/spacing on your RS heads is different compared the older EJ22t motor. Therefore you need to run your RS intake manifold if you run the RS heads.

It sounds like you need to do A LOT more homework before you even think about doing this.
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Old 08-10-2005, 11:07 AM   #5
gavinjay
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lol....ya, i do need to do a lot more homework lol.........which is what im doing. and your helping greatly!!! so thanks!

ya ive heard when you do this setup your ECU wont work.....
that pretty obvious tho...
i guess ill need something like an SAFC

in terms of the valve terrain, i was jsut curious as to weather or not the RS valves/springs could hold up to the boost?

i know my differentials/brakes and stuff shouldnt matter, but i see a lot of people chaning their rear diff's when doing swaps....and in turn they have to swap brakes and such.....i guess none of that would matter tho since my stock diff will work work with my stock tranny and everythign else shoudl be fine....

anyhow.....with the stock RS EMF and IMF, will i need to get custom turbo piping made? or will the uppipe from say a WRX work?
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Old 08-10-2005, 02:16 PM   #6
Legacy777
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It's valve train, not valve terrain The rs valves and stuff should be fine.

The intake manifold shouldn't be too big a deal....depending on whether you run an intercooler or not, you'll have to do some custom fab/piping work anyhow.

For the exhaust, yeah if you keep the stock manifold, you'd definitely need custom piping. But I honestly think that'd be more of a hassle. Just get a WRX header & up-pipe. It'll work.
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Old 08-12-2005, 08:17 PM   #7
Natoe
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why wouldnt he just leave the stock uppipe, it is catless unlike a wrx one, even the stock downpipe, and mate it to your RS exhaust from there back until you upgrade to wrx up+downpipes and a bigger turbo catback.
i put this engine in my 95 impreza and im using stock uppipe, wrx catless downpipe, and a stock sti catback
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Old 08-13-2005, 12:55 AM   #8
Legacy777
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Yeah, he can do that.
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Old 08-16-2005, 04:22 PM   #9
gavinjay
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interesting....

well from what ive heard....
the ej22t stock pistons can only hold 12 psi
and so i was advised to upgrade them....

which would be smart, if i wanted to go for some higher boost in the future

so if im gonna get better pistons put in the block...
i might as well do the piping so that its ready to handle more power also
instead of getting custom piping etc... and then having to spend money in that area again

however.....
i wanted to keep my stock catback or muffler at least....for the time being
ive had my bad experiences with loud exhausts and civics (or maybe it was just the civic)

is that possible with a wrx downpipe? to keep my stock backpiping?
if not, i guess id have to use wrx/sti back piping, but will i be able to bolt my stock muffler to that?

.....im assuimg those are both "no's" and youll tell me to get a borla hush or somehting if i want quiet...


*edit: ive been talking to a shop near by about the swap....and wow i learn so much everyday. anyhow, their selling a ej22t (complete) for $1000CDN
i dont need a complete swap obviously....just the block....
but he said the block on that motor needs new bearings anyhow....
so it seems like kind of a waste to me, but give me your opinions.....
and i knwo someone who is selling a ver5 sti shortblock with a spun bearing
is that worth picking up? would it be a better option than the ej22t block?
will that mate to my heads? if so what will it do to the compression.

sorry for more noob questions, and thanks again for the knowledgeable replies.

Last edited by gavinjay; 08-16-2005 at 04:29 PM.
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Old 08-16-2005, 09:12 PM   #10
Legacy777
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Where did you hear the stock ej22t pistons can only handle 12 psi?
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Old 08-17-2005, 01:49 AM   #11
reddevil
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He read it on the internet!
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Old 08-17-2005, 05:15 AM   #12
Drac9
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Someone should tell mine they should have broken 18psi ago.
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Old 08-17-2005, 10:52 AM   #13
Matt Monson
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Actually,
there's some misinformation here. You cannot use the SOHC EJ25 heads with a stock WRX crossmember and up-pipe. The up-pipe with hit the back corner of the head. Some guys have ground chunks out of their head to make it work, but I think that is nutz!It is better to go with an aftermarket up-pipe from a turbo kit or have a custom one made. You can use your stock headers or a Borla header in this configuration...
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Old 08-17-2005, 11:25 AM   #14
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I know of several Legacy Turbos running 16 psi on TD05-16g turbos, and my wife car has run 14 psi on a Td04-15c, and commonly runs at 12 psi.
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Old 08-17-2005, 12:22 PM   #15
gavinjay
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i see, well the guy over at fourstarmotorsports was the one who tol dme the pistons would only handle 12psi....

which to me seemed pretty stupid to tell you the truth, considering everyone says the legacy blocks can hold so much boost...etc...
i was wondering what would be the benefit of using that block if id have to change pisons.... =/

"The block will need new bearings, if you plan on using more boost, over
12 psi, you need to change the pistons.

Thanks

Dan"



also........so i DO need to get custom uppipe with the ej25 heads and the wrx crossmember?
does that apply to all other upgraded cross members, such as an STi one (which is what the shop has for me)
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Old 08-17-2005, 12:35 PM   #16
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you need to just sell me the block! no really, that thing is bullet-proof, and also very rare. rebuild it with stock internals (or have it rebuilt, the valve terrain can be tricky), legacy777 did this not to long ago with his ej22t. seriously guy, you're lucky to have one of those
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Old 08-17-2005, 12:37 PM   #17
josh...just josh
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and you do not need to change the pistons to have more boost, the factory ones are forged and have a good compresssion ratio for boost, and running 2.5 heads on it is just going to bring the compression down further
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Old 08-17-2005, 01:09 PM   #18
Legacy777
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Quote:
Originally Posted by josh...just josh
and you do not need to change the pistons to have more boost, the factory ones are forged and have a good compresssion ratio for boost, and running 2.5 heads on it is just going to bring the compression down further
Factory pistons are not forged. They're cast, but do have a coating on them.

Lots of pics of the teardown and rebuild can be seen here
http://www.main.experiencetherave.co.../images/ej22t/
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Old 08-18-2005, 03:06 PM   #19
gavinjay
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ive seen that site... looked through most of it infact...

anyhow, i heard of a guy who was in my same situation, he ended up buying the block from subaru, and it was aparantly nto much more than he was gonna pay for the used one...

but after all of your advice im kind of reconsidering this when i think about the expenses involved, like the block and if im not able to find a good one....rebuilding another one, crossmember, piping, turbo, ecu, id probably want some gauges, bov, intercooler, and im sure you guys can think of much more.

it seems like id be looking at spending around 5-6K
iono if im ready to spend THAT much money at one time...

...but doesnt mean i cant keep learning until im ready
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Old 08-18-2005, 09:22 PM   #20
Legacy777
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Yup....it's not cheap.

I've got about $4,300 into my swap so far, and it'll easily surpase $6k with the exhaust I'm getting.
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Old 08-19-2005, 09:28 AM   #21
gavinjay
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wow. and id assume your talking in US funds.. =/
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Old 08-19-2005, 09:56 AM   #22
Legacy777
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yup....US funds.

Granted I'm replacing a lot of stuff and doing work that you could probably skimp on, but in the end, it's the details that count.
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