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Old 02-08-2009, 10:44 PM   #1
chinpocoman
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Subaru Stars trying to swap an 05 sti engine into my 02 wrx

hi guys i need some help with this swap i am about to buy an 05 sti engine and swap it in my 02 wrx so the question is ...can i still keep my 5speed tranny,clutch,motor mounts,starter ,harnesses ,ecu,850cc injector ect and everything else except for my 2.0 engine i mean the 05 sti engine is a 2.5 liter and my 02 is a 2.0 right ? the only reason why i wanna keep this tranny is because 2 years ago i replaced my tranny`s internals and the best option i had was the jdm sti 5 speed version or V.7 STI RA Gearset Cryogenic Hardend 1st through 4th gear in other not to break from engine power so thats the one my car has at this moment just one more thing and last could i still keep my SR55 Dual Ball Bearing Turbo Charger for this 05 sti engine ...alright guys this is it any answer or help will be much appreciated you all have a good day and thanks
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Old 02-08-2009, 11:28 PM   #2
anickode
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Drink in hand now, so let's reword this...

First off I'd like to mention that an engine swap, particularly in a Subaru is a huge task. Many, even most of the parts are interchangeable to a certain degree, but there are a lot of "if's" and "unless"s involved. Your transmission will be fine, as will your clutch. Motor mounts should be upgraded regardless. Injectors should be fine if you're using the wrx manifold and TGVs.

Harness.... that's a big issue. Are we talking full ECU replacement here? If that's the case, then you need to swap the wiring harness too. There are several differences with the STi ECU from the WRX ecu including the use of dual crankshaft position sensors and variable timing.

There are tons of factors that play into a swap like this, and many of those factors can end up screwing you over if not planned for in advance. If you really have your heart set on an STi swap, then by all means go for it, but please realize that bolting the engine in place is about 5% of the total work involved in this sort of project, and the cost of the engine represents perhaps half of the total dollar amount you will most likely put into it.

Last edited by anickode; 02-08-2009 at 11:59 PM. Reason: / rant.
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Old 02-08-2009, 11:35 PM   #3
Audiosavvy
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thanks for the edit, anickode

Last edited by Audiosavvy; 02-09-2009 at 12:06 AM.
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Old 02-08-2009, 11:57 PM   #4
pro934
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Yes the Sti is a 2.5 and you are 2.0. You can keep and re-use your turbo. You will need the electronics from the Sti I believe if you are doing a full swap. If you are just doing a hybrid swap you may be ok with yours (just STI block swap). You should be able to use your 5-speed. If your are using your TGV's from the wrx motor you can re-use your injectors, otherwise no, all 05 Sti's are sidefeed. Same goes with your intake manifold, the Sti is drive by wire where your wrx is cable. Definatly do some research to make sure for yourself on all your questions, don't rely on everyone here to get you the best or correct answer.

Last edited by pro934; 02-09-2009 at 01:46 PM.
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Old 02-09-2009, 10:27 PM   #5
chinpocoman
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oops i never thought of it like that well the reason why i wanna get rid of this engine is because is burning oil like theres no tomorrow so you guys think i should re-build this engine or get this sti swap ? but so far guys i am really happy with yer help and advises here i really appreciate that
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Old 02-09-2009, 11:05 PM   #6
MasterKwan
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If you want it done quick and remain stock, find a junk yard motor and install it. If you don't mind it taking awhile and costing, do the STI. If you go STI, you'll have to get a tune before you're done so, you have to factor that in too. Your current injectors might be too small too. You could probably use the STI injectors with your manifold (swapping the TGV housings) but, again then it's tune time.

The easiest thing is to fix or replace your existing engine.
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Old 02-09-2009, 11:48 PM   #7
rexblake
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Quote:
Originally Posted by pro934 View Post
Yes the Sti is a 2.5 and you are 2.0. You can keep and re-use your turbo. You will need the electronics from the Sti I believe if you are doing a full swap. If you are just doing a hybrid swap you may be ok with yours (just STI block swap). You should be able to use your 5-speed. If your are using your TGV's from the wrx motor you can re-use your injectors, otherwise no, all 05 Sti's are sidefeed. Same goes with your intake manifold, the Sti is drive by wire where your wrx is cable. Definatly do some research to make sure for yourself on all your questions, don't rely on everyone here to get you the best or correct answer.
So if you are just using the 2.5 short block, you can reuse your ECU and wiring harness along with the WRX intake and exhaust manifolds?
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Old 02-10-2009, 10:43 PM   #8
chinpocoman
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geez man this car is driving me crazy my clutch broke yerterday on the way home from work good thing i know how to drive without using the damn clutch lol
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Old 02-11-2009, 09:25 AM   #9
anickode
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Quote:
Originally Posted by chinpocoman View Post
geez man this car is driving me crazy my clutch broke yerterday on the way home from work good thing i know how to drive without using the damn clutch lol

Well count on that clutch costing you at least 500 bucks if you do the install yourself...
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