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Old 05-20-2005, 09:49 AM   #1
kheff46
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Join Date: Jul 2004
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Location: Medina, Ohio
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2002 WRX wagon
silver

Default wrx wagon w/sti 2.5 motor?

what kind of extra parts are needed for the swap?
-2.5l block
-EM of sorts
-what else??
this sounds like the easiest way to go big with a wrx wagon, am i missing something? i can leave avcs unhooked, and use wrx manifold to bypass DBW, will anything else set me back time or serious $$? thanks for your opinions!
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Old 05-20-2005, 10:57 AM   #2
sjl1614
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are you going with just the shortblock or longblock? First you say "2.5l block", then later on "avcs". If you do just the short block and use wrx heads, no needs for different EM. Putting in the STi longblock will require the STi ecu, if you want to run avcs. I just put a STi block and V7 heads in my wagon, i used the JDM ecu for EM, runs great!!
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Old 05-20-2005, 11:02 AM   #3
benjaminetanyahoo
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Quote:
Originally Posted by sjl1614
are you going with just the shortblock or longblock? First you say "2.5l block", then later on "avcs". If you do just the short block and use wrx heads, no needs for different EM. Putting in the STi longblock will require the STi ecu, if you want to run avcs. I just put a STi block and V7 heads in my wagon, i used the JDM ecu for EM, runs great!!
So let me get this straight, you can do a WRX swap and put in the STI shortblock without a EM change? I imagine some sort of flash would need to be done for a proper tune, but I swore a EM change was needed. That's interesting because if that's the case I may just go that route.
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Old 05-20-2005, 11:31 AM   #4
sjl1614
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You might need a reflash just to readjust for the extra .5 liters from the STi block, and you will have to connect an extra breather hose on the STi block
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Old 05-20-2005, 05:19 PM   #5
kheff46
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pfffrrt! that was my brain this morning! o.k. 1...2...3... dumbass! sorry guys!
i'm buying a wrx wagon. i was looking at another guys v7/v8 heads, and i combine thoughts and got all funked up! i realize avcs is attached to heads, and if i'm using stock heads there's no avcs on usdm wrx's. i know the err of my ways.
let's recap!
my(soon to be) wrx can accept the 2.5 sti short block with no major modifications? i may not need a reflash or any extra EM?
what, if any modification will the 2.0 heads need to fit(oil/h2o passages matched)?
and i'm assuming the wrx clutch will work until i get out of the driveway right?
fuel pump any different?
i have a turbo OBS and i want sti power, but i'm not about to go through all the work putting that in the OBS. this wrx setup is what sounds most feasible with my budget. i know i have to get a new car, but that is part of the fun right?
thanks for the quick reply guys! i'll let you know what happens!
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Old 05-20-2005, 05:59 PM   #6
Kreeger
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Quote:
my(soon to be) wrx can accept the 2.5 sti short block with no major modifications?
YES
Quote:
i may not need a reflash or any extra EM
Yes, you do need a reflash... especially if you upgrade the injectors and turbo
Quote:
what, if any modification will the 2.0 heads need to fit(oil/h2o passages matched)?
None. The heads will match and bolt right up with no mods.
Quote:
and i'm assuming the wrx clutch will work until i get out of the driveway right?
Yes... the clutch assembly is identical.
Quote:
fuel pump different?
No, but if you plan on using larger injectors and a turbo upgrade, then, yes... upgrade the fuel pump.
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Old 05-21-2005, 09:14 AM   #7
kheff46
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what kind of power level will the stock clutch hold?
what level will stock fuel pump push?
what size injectors will max out the fuel pump? any clues?
thanks a ton guys!
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Old 05-21-2005, 10:33 AM   #8
totoherbs
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Quote:
Originally Posted by kheff46
what kind of power level will the stock clutch hold?
what level will stock fuel pump push?
what size injectors will max out the fuel pump? any clues?
thanks a ton guys!
What clutch the 5 or 6 speed? Just upgrade to the walbro its cheap and works good for everything, but the huge injectors 750cc+.
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Old 05-21-2005, 04:45 PM   #9
kheff46
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5 speed clutch, sorry!
walbro 250lph or whatever it's rated at.
what will the 750+cc's feed 400-600hp?
not that i'm going for that right off the bat, but it's nice to know options!
thanks man!
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Old 05-21-2005, 06:30 PM   #10
Boxologist
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if already have an OBS, swap into that. buying another car and then paying for a swap may not make much finiancial sense. besides, the 5mt in a wrx won't be up to teh task of teh bigger block for long.
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Old 05-22-2005, 10:14 AM   #11
kheff46
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there's a very short list of upgrades that fit on my OBS compared to the wrx. i already have a wrx turbo kit in my OBS. i want to get rid of my car while it's still in great shape! i'd need way more parts to shove an STi engine in(clutch, pedal assy.,ecu, etc.). and still have a ten year old car with 150k+ and crap for resale value. anyone outside subaru world would gladly walk quickly away from that car on a dealers lot. anyway i doubt my tranny would hold up any better than the wrx's would! i'll get more out of the car than i paid so it's time for a new ride! thanks for the shout guys!
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Old 05-23-2005, 04:33 AM   #12
mykrrrr
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As others will attest, you WILL need some sort of EM whether it be a reflash or standalone (better option) I can attest to a car that'll run but not run to it's potential w/an EJ257 w/EJ20 heads/intake/etc.

750cc injectors will be overkill IMO unless you're trying to get a LOT of HP outta it. You'll probably be fine w/550cc's. I'm running 440cc's on my JDM/USDM STi swap and it's running pretty strong. I'd like 550cc's and to install my FPR before I do anything more.

Walbro 255l fuel pump is definitely a good thing.

You're on the right track w/your ideas. GL...

-mykr.
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Old 05-23-2005, 09:41 AM   #13
kheff46
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what size are stock injectors? 270-330cc ish? what kind of power am i limited to with those do you think?
i have to use everything off my soon to be stock wrx(heads,turbo,ecu,tmic,). what will i need to build a durable 350-400 awhp motor.
turbo- gt30-35, fp, etc.
cams- STi, ??
with stock STi headgasket and stock wrx heads what's my compression ratio gonna be?
is there a better option with a thicker headgasket?
i'm glad someone is doing this, the STi block is so new i've had no time to find specs and firgure anything out. thanks for all the help guys, you make it possible!
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