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Old 05-11-2015, 03:38 PM   #201
Timo1202
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Member#: 403961
Join Date: Oct 2014
Vehicle:
2002 Wrx
Psm

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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, 11:37 AM   #202
Zombie kitty
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Member#: 489022
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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, 11:44 AM   #203
TROLL
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Member#: 14424
Join Date: Jan 2002
Chapter/Region: South East
Location: Stuart, FL
Vehicle:
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, 12:56 PM   #204
Zombie kitty
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Default

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, 01:54 PM   #205
T-37
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Member#: 175624
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Wichita, KS
Vehicle:
0304 WRX WRX
SY WRB

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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, 07:25 PM   #206
TROLL
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Member#: 14424
Join Date: Jan 2002
Chapter/Region: South East
Location: Stuart, FL
Vehicle:
BugI w/ 07 STi Swap
www.TriStateTuners.com

Default

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, 11:17 PM   #207
Saturnmike
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Member#: 496814
Join Date: Jan 2019
Chapter/Region: International
Vehicle:
03 Wrx
Blue

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, 07:24 AM   #208
Dave1513
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Default Sti swap

Interesting
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Old 10-25-2019, 12:52 PM   #209
Shadow.Subie
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Member#: 491779
Join Date: Sep 2018
Default So important info for the swap

Iím swapping a 2007 Impreza 2.5i with a 2005 STi, drivetrain, brakes, interior, wiring, everything. Some things that you need to know if youíre doing this are...
-If you want to keep the rear diff temperature sensor, youíll 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 donít 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, donít 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 donít have and be prepared to spend a lot of money.
Iíll be doing a full write up when the swap is finished.
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Old 11-04-2019, 05:11 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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