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Old 09-10-2008, 12:24 AM   #1
Complacent_One
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Talking It's Alive.......04 STI into 02 WRX Wagon that is!

So after two weeks of juggling work, kids, and first semester, I was able to damn near complete my swap. Needless to say, swapping over the harness from the 04 STI was a PITA!!! The thought process was not too bad, but pulling everything apart and making sure nothing is lost sucks. So a few things I found while performing the swap....by the way, just started it a two weeks ago and still have to reinstall the seats, carpet, and the Cluster Sub-Harness which will be hear tomorrow.

1: Have plenty of frosty beverage on hand.......and someone who can make restocking runs!!

2: Not really any need to mark the harness while removing...at least not for an electronics tech like myself.....there are only two or three plugs in the car that will go somewhere other than where they were designed to go.

3: Be sure that you get the sub-harness for the instrument cluster. The 02 wrx has a 20pin and 24pin molex that go to the hazard, clock, and (3)cluster plugs. The STI has 2 24pin molex plugs...4 extra on the one for the two wires needed for the sun load sensor.

4: I was a little upset when I took a look at the rear harness (tail lights, fuel pump...etc..) because since I have a wagon I figured I would have to change quite a few pins.....in an attempt to test, I found out that all the rear lights and fuel pump will work with the factory harness. The only parts lacking will be the ability to control the rear window wiper and the intercooler spayer. These few wires will be added at my convenience in the near future.

5: Tonights discovery, I decided to keep the factory fuel filter in place in addition to the intank fuel filter located on the STI fuel pump carriage. Well after an hour or so of trying to start the car....(Checked spark, Fuel Injector clickity..clack...fuel smell from the exhaust...I found out the hard way that the hard fuel lines on the STI and the WRX are swapped. The feed and the return are flipped. Pulled the ole switcheroo and bingo, the car fired right up with slightly high idle, then settled right down!!!!! SCORE!!!

6: The rear door harnessed have completely different connectors, at least on my car, so be prepared to cut and splice. Especially since my rear window are down...

7: Obvious...have to cut and splice due to the HID harness for the headlights.

8: Since I am retaining my original 5MT for know, I had to modify the 6pin STI (two extra for DCCD) to the 4pin on the 5MT. Also the connector for the Speedo sensor, while 3pin on both, are different connectors....


I am sure there are more things that I am missing, but all and all it was pretty nasty...but fun at the same time, especially when you here the 2.5L rumble!!

Hope this helps at least one of you out there.....AVCS...good to go!!!
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Last edited by Complacent_One; 09-11-2008 at 10:41 PM. Reason: timeline mistake...too many brewskis
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Old 09-10-2008, 12:43 AM   #2
bugeye-brawler
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CONGRATS>>> IT'S ALIVE

awesome bro that's great to hear i;m planning a swap on my 02 sedan so all the specific examples help...

pics would be awesome!!! and more details please i need all i can get... well of coarse when you're ready enjoy that beast first you've deserved it

as for wire diagrams or anything you have please send them my way
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Old 09-10-2008, 12:53 AM   #3
bugeye-brawler
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i guess my next question is how did you figure it out...
i mean are you a mechanic or what?

i'v been running these threads backwards and forwards to get ready and i'm planning my swap for a year and half when i have the money and knowledge i'm just wondering if i'm not a mechanic do you think i can pull it off in that time?
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Old 09-10-2008, 01:12 AM   #4
Complacent_One
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I suppose I am just fortunate enough to remember things....that most people find unimportant. More than that, I really have always had a hard time letting other people do work that I am more of capable of doing...

I actually installed Car Audio and Security for 7-8 years professionally before I started working on radar and comms in the navy...Now I am a Field Service engineer for a PRO A/V broadcast integrator...So to answer your question, No I am not a licensed mechanic..but who needs a license anyways!!! You just need the drive!!

If you have any questions, I would be more than happy to lend any help I can. By all means I am not an expert, but figuring things out might as well be my middle name.

Much to my regret I did not take a whole lot of detailed photos during the swap, but I do still have the carpet out. I will take a bunch of photos and add text to the crucial areas.

The good thing, is that you could ask me about this in six years and I could still tell you the colors and pin locations of most of the stuff I had to rewire. PM me your email an I will send you the 02-03 WRX Manual and wiring.....if you happen to be doing an 04 motor I have the goods for that too!!
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Old 09-10-2008, 01:16 AM   #5
Complacent_One
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Can you pull it off??? Not if you are intimidated by the idea..but if get the right info and prep yourself to not have the snags I did...then you are set!!

I knew when I would need help...that was the removal and reinstall of the engine. If you have someone to help you with the dash and all that would be a plus...
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Old 09-10-2008, 11:06 AM   #6
bugeye-brawler
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awesome ya i've had the drive for a long time... i think i can do it but i just didn't want to go in nieve and get blown out of the water

i have the dive head first mentality and then figure everything out as i go

congrats again on your swap have fun with that
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Old 09-10-2008, 01:21 PM   #7
bugeye-brawler
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so even with using the entire STi harness you still had to splice and solder a lot of wires right? i just read the sticky thread on the RS > WRX swap was there that much soldering involved... that looks like fun
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Old 09-10-2008, 02:45 PM   #8
Complacent_One
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Not near as much as that RS Swap.

Just the headlights, rear doors, transmission plug(because I kept the 5MT), Speedo Sensor...can really think of much else.

I will still have to add wire for my rear wiper/washer...just because I have a wagon and those are not included on the STI harness (sedan only). 98 percent in plug and play....
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Old 09-10-2008, 09:41 PM   #9
drftwell
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02 wrx to 04 sti here -----so the motor harness to the ecu is bolt in - then all you have to do is wire up the headlights,rear doors, and im going 6mt, speedo???? hmm.... i was thinking there was alot more.... hows the dash harness? I have the entire motor harness and the dash harness and the drive by wire stuff..... what would you suggest i start on first? also any info (pinouts and whatnot would be a great help!)
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Old 09-10-2008, 10:16 PM   #10
Complacent_One
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You will also need the Heater/AC Evap box and the blower box, along with the STI HVAC controls. Speedo and tranny would be straight plug in as long as the tranny is from an sti.

First things first....pull the seats, carpet, dash, dash bar, hvac boxes....once those are pulled you can remove the compartment Bulkhead harness and go from there.... I have not done the rear doors yet, but I am sure I can get you the pinouts fairly quickly. Once you have the harnesses swapped, then R/R the motor tranny set....you get the picture....
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Old 09-11-2008, 08:02 PM   #11
bugeye-brawler
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got ya then swap the new harness in while cutting and splicing along the way...
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Old 09-11-2008, 09:21 PM   #12
Complacent_One
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Just finished the front wipers...you do not have to replace the wiper assembly w/ the 04. The plug is the same, Subaru just decided to move around the 5 wires. The connector is a cinch to take apart. Just swap the 5 terminals back into the correct spot in the connector.

I will post up a diagram and instructions soon..
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Old 09-11-2008, 10:07 PM   #13
breathinez
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Looking for info on an 05sti motor in a 02. I thought this was gonna be just plug and play sorta thing. I was going to go with a ej207 v7 but couldn't find one. t seemed like the v7 was gonna be easier especially with the wiring. I'm definitly gonna be busy reading all I can. Any info you could point me towardswould be great.
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Old 09-12-2008, 02:10 PM   #14
bugeye-brawler
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check out dummies guide to sti swap... ask wrinkleboi too he knows whats going on also complacent knows a lot on wiring too

as for the swap... the 04 is more plug and play then the 05 they made a lot of changes to the 05+ models which make them more a treasure hunt and splicing adventure.

which is my next question why did you decide to use a 04 Complacent_One from what i've found the 05+ models are more reliable and in a sense strong??? i'm not saying you're wrong or stupid i just want to hear the other side of the argument for once nasioc has a thing for being really one sided o things
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Old 09-12-2008, 03:06 PM   #15
Complacent_One
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As far as I know..the differences in strength may have to do with the 6spds. I have never heard any issues w/ the motors...That would be news to me. When I swap the tranny in the future I will do a bit more research..
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Old 09-14-2008, 06:14 PM   #16
drftwell
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do i have to use the sti hvac? i dont really understand how that would be much different ? Could i not rewire my stock stuff? HVAC - the heater and air condition right?
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Old 09-14-2008, 06:58 PM   #17
Complacent_One
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Not sure if you could rewire...or not.. You would have to do a bit of research of the signals used by referring to the two manuals.

By the way...finally got the car on the road last night. Pretty nasty!!! Have to take it easy till I break the clutch in!!
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Old 09-14-2008, 10:02 PM   #18
bugeye-brawler
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awesome bro well make it quick so you can open her up
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Old 09-15-2008, 12:09 PM   #19
Complacent_One
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It is officially up and running....Just passed the state inspection this morning...the girl is legal now!!!
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Old 09-16-2008, 02:35 PM   #20
bugeye-brawler
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sick do you know when you will be swapping in the transmission?
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Old 09-16-2008, 02:37 PM   #21
bugeye-brawler
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I have a 4spd so i've been looking up info for the tranny swap... can i just swap out both axles and everything when i move the tranny to make it easier?
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Old 09-16-2008, 02:40 PM   #22
bugeye-brawler
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have you gotten a tune yet? i was just thinking about that... which EM system are you running and what kind of tune are you planning on getting?
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Old 09-16-2008, 03:50 PM   #23
Complacent_One
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Cobb APv1 with Stage II as the base map, and economy map is flashed realtime for the clutch break in and to keep me honest!!
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Old 09-16-2008, 05:03 PM   #24
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awesome and you did the tune by yourself
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Old 09-16-2008, 07:33 PM   #25
Complacent_One
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Just an OTS (off the shelf) Map from Cobb. I think it says something like 350HP 385TQ at the flywheel...278WHP 316TQ @ the wheels on there test car. That is more than recommended for the stock 5MT tranny...hence, keeping it in the Economy mode, which limits the map to 5lbs of boost and better fuel eco. So far I have got 210miles on the first half a tank......
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