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Old 05-11-2015, 02:38 PM   #201
Timo1202
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So I guess I'm bumping up and old thread, but I'm in the middle of swapping my 2002 wrx with an STI swap out of a 2007 STI limited. And had a question, I was curious if I could use the abs hardlines that are still in the wrx and get them to work with the STI abs module? The abs is really the only thing holding me up. Has anyone tried this?
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Old 08-02-2018, 10:37 AM   #202
Zombie kitty
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Default 03 wrx

Quote:
Originally Posted by TROLL View Post
*I plan on revising / reorganizing this but just wanted to get something started for now...*

Intro
So I did a full 07 STi swap into my 03 Bugeye about a year ago and surprisingly I still get PMs very regularly from people interested in doing something similar. Some requests are more realistic than others but I try to respond to all of them with advice the best I can.
I figured it might make more sense to make a thread about it where some of us can combine our knowledge and experiences for those who are trying to research it.

This thread is open to any and all experienced swappers, and hopefully it will be full of good, knowledgeable, experienced insight on the different scenarios and options available, and the pros and cons to each.

I don't have a lot of time right now to write a short novel on things but I'll kick it off with the PM I just responded to someone with, please feel free to add to it, but please only post with information if you are 100% positive that it is correct.

You can view the documentation and photos of my swap HERE if you're interested...

So you think you've got what it takes, huh?
First off for those considering doing an STi swap, I'd tell you to consider just buying a used STi instead. It will most likely be cheaper in the end after all is said and done, and it will be a factory build which will greatly reduce the risk of any issues that may arise from getting your paws on just about every single bolt, wire, and hose on the car. Swaping is not something I'd recommend for everyone, thats for sure. Its pretty involved and can be quite expensive.
However if you've read this far and are still intent on doing something a little more unique and challenging then word up... I'll try to help you out on your journey. It certainly can be done, and the results can be fantastic.
Additionally, if you're intent on keeping your WRX and swapping one way or another, in most cases I much prefer the complete engine swap to doing a 'hybrid' which is a 2.5L shortblock mated to WRX heads. The cost of parts and labor adds up with that most of the time, and the dollar/hp and dollar/effort ratios just arent there IMO versus a complete STi engine swap.

The road splits here, choose a path
When going WRX to STi, here are the three options that come to mind
...
1) STi motor only with original WRX wiring and ecu (AVCS wont work, not a big deal)
if you do motor only you will reuse your wrx intake manifold and throttle body, all of your original wiring including engine harness, original ecu, and so on.
You will need a currently backordered gruppe-s cam position sensor adapter to make this work. Cosworth also sells one that is in stock, but I haven't verified if it works well or not yet.

2) STi motor only with original wrx wiring and standalone like a Hydra (AVCS will work with harness)
if you do motor only with standalone you can get AVCS to work, but the Hydra is expensive and there are disadvantages to a standalone (as well as advantages).
You will need a currently backordered gruppe-s cam position sensor adapter to make this work. Cosworth also sells one that is in stock, but I haven't verified if it works well or not yet.

3) STi motor, complete wiringwiring, ecu, and more to make it all work including operational AVCS
if you want to do motor, wiring, ecu, etc. then it will require a lot more parts... you will need to pull out all of the original chassis wiring out of your car headlight to taillight and replace it with STi, you'll need a complete STi motor with engine harness, as well as many accessories like ecu, immobilizer system (if an 05+ STi), gauge cluster, abs controller and hardlines, dbw gas pedal with adapter bracket, and so on.

I recommend the first option because it is about 60% of the cost and about 30% of the effort to pull off and you get 90% of the benefit. the only drawback is you will not have an operational AVCS which aids in spoolup and a bit of torque, but it doesn't make a big difference so its not a big deal considering the added cost and complexity.

If you are paying a shop for the swap, plan on $1200+ for the labor of the motor only option and $3000+ for the complete conversion.

Some Inspiration
And since there's a whole lotta text on this page, lets add a couple pretty photos, cause I know you guys like that. Perhaps a little inspiration...

Nothing goes better with a pretty red intake manifold than a set of EDM Bugeye headlights


07 Interior Conversion: Gauge Cluster, Steering Wheel, Center Console, JDM Seats/Doorcards, etcetera


I'm tempted to whore out more photos but we'll try to stick to the facts here, so those are my 'finished' photos of the swap that I have handy...


I have a 03 wrx, what would I have to do to put in a 03 STI motor?
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Old 08-02-2018, 10:44 AM   #203
TROLL
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BugI w/ 07 STi Swap
www.TriStateTuners.com

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Quote:
Originally Posted by Zombie kitty View Post
I have a 03 wrx, what would I have to do to put in a 03 STI motor?
I would recommend starting by reading this thread, lolol.
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Old 08-02-2018, 11:56 AM   #204
Zombie kitty
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Quote:
Originally Posted by TROLL View Post
I would recommend starting by reading this thread, lolol.
I did, he was talking about a new motor I would like to know if there is a difference or if it would basically just drop in
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Old 08-02-2018, 12:54 PM   #205
T-37
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Quote:
Originally Posted by Zombie kitty View Post
I did, he was talking about a new motor I would like to know if there is a difference or if it would basically just drop in
You didn't even read the post you quoted.
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Old 08-02-2018, 06:25 PM   #206
TROLL
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BugI w/ 07 STi Swap
www.TriStateTuners.com

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Quote:
Originally Posted by Zombie kitty View Post
I did, he was talking about a new motor I would like to know if there is a difference or if it would basically just drop in
Haha, yeah I'm pretty familiar with what "he" said.

You need to put forth the effort here -- the community will be happy to help you a bit with it, but if you're not even stopping to read the very thread you're posting in where there is a ton of info, then no one else is going to do it for you.
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Old 01-22-2019, 10:17 PM   #207
Saturnmike
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Default Wrx to sti swap

So I have an 03 wagon 5spd and I have a wrecked 03 sti. Is this a simple enough swap? I should be able to could use a lil help. New to Subies.
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Old 02-28-2019, 06:24 AM   #208
Dave1513
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Default Sti swap

Interesting
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Old 10-25-2019, 11:52 AM   #209
Shadow.Subie
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Default So important info for the swap

I’m swapping a 2007 Impreza 2.5i with a 2005 STi, drivetrain, brakes, interior, wiring, everything. Some things that you need to know if you’re doing this are...
-If you want to keep the rear diff temperature sensor, you’ll need to drop the tank and remove the wiring harness from it, it unplugs under the rear seat.
-Try to buy a cheap parts car, it will make it much much easier than having to source every part.
-Figure out a set plan so you don’t have to go back to do things and triple check everything before moving on to the next step.
-Try to keep as much stuff together as possible, for instance if you are pulling the front subframe, don’t bother taking the steering rack and PS lines and pump off, just remove everything as 1 piece, this insurances that everything is together correctly.
-Just remember that this will not be a quick and easy process, you will run into problems and things that you are unsure of, just do your research and figure out how to solve the problems you run into.

Good Luck with the swap if you are going through with it. Just be prepared to need small things that you don’t have and be prepared to spend a lot of money.
I’ll be doing a full write up when the swap is finished.
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Old 11-04-2019, 04:11 PM   #210
CosmicChocolate
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this will help me a lot thanks im planing on doing a swap in my 02 rs
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Old 01-31-2022, 02:12 PM   #211
KehKeh
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Hi guys I see a lot of 02-03 swaps with sti and I know the 04 wrx is different than the 05-07 wiring. My question is to do a full sti swap in a 05 wagon do you need all the wire harnesses for the swap? Are any of the wires interchangeable? The sti I got this from was a 05 as well. I have the 2.5L, 6sp trans, axles, sti ecu, hubs and knuckles. I have been reading up on where you need to get the harness for 02-03 swaps because they changed the wiring. I was wondering which wiring harnesses do I need to do the full swap?
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Old 04-14-2022, 12:46 AM   #212
JRwall
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Reviewed all the conversions and they all appear to be from early 2000 models. Looking to see if the same applies for my swap from an 2011 WRX engine to a built IAG STI block. Currently have it running and tuned with the stock 2011 wiring harness. Planning to swap the wiring harness over to STI to get access to the exhaust cam timing. Will I need more than just the engine harness?
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Old 04-14-2022, 01:19 AM   #213
K3rm1tth3fr0g
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Link G4X flex tuned
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Quote:
Originally Posted by JRwall View Post
Reviewed all the conversions and they all appear to be from early 2000 models. Looking to see if the same applies for my swap from an 2011 WRX engine to a built IAG STI block. Currently have it running and tuned with the stock 2011 wiring harness. Planning to swap the wiring harness over to STI to get access to the exhaust cam timing. Will I need more than just the engine harness?
You need DAVCS heads which your 2011 WRX does not have.
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Old 04-14-2022, 02:04 AM   #214
JRwall
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The IAG 900 long block that I have in the car has DAVCS.
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Old 04-14-2022, 09:24 AM   #215
K3rm1tth3fr0g
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Quote:
Originally Posted by JRwall View Post
The IAG 900 long block that I have in the car has DAVCS.
Then you need the appropriate solenoids and wiring assuming you don't have it already + the DAVCS ECM IIRC.
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Old 10-20-2022, 08:00 PM   #216
JRwall
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Then you need the appropriate solenoids and wiring assuming you don't have it already + the DAVCS ECM IIRC.
For the appropriate wiring that would of course include the engine harness. But in my research some sources say I would need the dash harness as well, but other sources say not required.
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Old 02-02-2023, 12:23 AM   #217
VegieCruiser
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My 17 year old son bought a 2000 Subaru Impreza that originally had a 2.5L engine in it. The previous owner had swapped in a JDM engine, a 2002 2L turbo model. He swore it had run but that he had recently pulled the engine to replace the clutch. Well my son bought it (against my advice) believing the guy and wanting to get it going.

Needless to say, it doesn’t run. We have tested fuel pressure, changed the spark plugs, checked the timing, etc. We have now gotten it to the point where it will turn over and catch for a second or two and then die. We then discovered that if we keep cranking it, it runs, that is, if the ignition switch is in the start position it will keep running and is responsive to throttle. We disconnected the power wire from the starter to disengage the starter.

I believe the wiring harness and ECU is stock with the 2000 Impreza.

Maybe the next place to go is the ignition switch?
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Old 02-03-2023, 11:55 PM   #218
VegieCruiser
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Got a new ignition switch....that didn't help.

:-(
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