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#1 2018-02-14 21:46:14

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

2002 WRX Transplant, Can It Be Done?

Hello 9-2x,

I might have made a bad decision to buy an EJ205 engine and complete 5MT drivetrain from a 2002 WRX.  Kinda pulled the trigger before I could do all the research I wanted to.  But hey, it was a screaming deal and if things are not going to work I should have no issues selling anything/everything and get my money back.

Main reason for my compulsive purchase were multifold.  1) I have already had my engine "rebuilt" by a Subaru mechanic and now leaks oil from three locations and still has low compression.  Worst money I have ever spent...  2) I have the 4EAT and would really like a manual.  3) I like to spend all my free time busting knuckles and cursing out inanimate objects.  4) Super reasonable for a complete engine, 5MT, full drivetrain and hopefully everything needed to complete the manual swap.

Before I get flamed, I have been looking at what is and is not compatible between the 02 WRX sedan and my 05 9-2x Aero.  However questions still linger.  If any of you fine people have advice/tips/tricks on my upcoming venture that would be most appreciated.  I'm thinking of doing things in three phases 1) Rebuild the 02 engine, doing most of the work myself and taking my time.  2) Swap the 02 engine for my current engine.  3) Swap the transmissions and all necessary parts to complete the manual swap into the 9-2x

So far I have the following:
Current car 2005 9-2x Aero with 4EAT trans and might as well be called stock.

From the 2002 WRX with 5MT sedan (maybe important info for drive shaft and or axles).
•EJ205 engine (complete engine: clutch, flywheel, intake, heads, turbo, intercooler...)
•5MT (shift linkage, trans mount, broken speed sensor)
•Front axles (still mounted to subframe, lower A-arms, rack, knuckles, rotors...)
•Rear diff (R160 still mounted to subframe, axles, driveshaft)
•ECU
•Mains wire harness
•ABS unit
•Master/slave clutch hydro assembly
•Clutch/brake pedal assembly
•Gauge cluster

So I guess I'm asking can this swap/build work (no machining, drilling, welding...)?

The parts I'm getting, will they work or am I going to run into physical issues?  Will the 02 sedan driveshaft work with all the 02 drivetrain swapped into the 9-2x?  Are the front and or rear axles too long/short from the 02 for the body/fame of the 9-2x?  If axles are the wrong length can I reuse the 9-2x axles with the 02 drivetrain?



Thanks to all who got this far in my post!
James

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#2 2018-02-14 22:12:15

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 2527

Re: 2002 WRX Transplant, Can It Be Done?

Totally doable, no wiring necessary. You can continue running your original ecu, it works with the manual transmission. The turbo inlet gray plug does not exist on the 02 turbo inlet, you can run the 02 turbo inlet without the gray plug, you will get a code related to that function that you can turn off on the ecu. You could also do the resistor trick at the plug for that code. Sedan axles are longer but said to work on the wagon. Front axles for the 02 transmission go on slightly different but can be converted to no stub like on your 05 transmission and then use your existing 05 wagon front axles. The rear axles off your 05 diff work on the 02 diff, you can continue to use the original rear axles without modifications.

I like the project, go for it.

Last edited by Rodman (2018-02-14 22:22:02)


2005 satin gray metalic aero, sold. 06 wrx, adios!
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2005 desert silver aero, work horse JDM EJ205 AVCS
2002 bugeye, sedan :-( new project

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#3 2018-02-14 22:36:21

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

Re: 2002 WRX Transplant, Can It Be Done?

Hey Rodman,

Thanks for the additional info!

So will I have to make any custom connections between the donor 02 items and my factory harness?  That's cool that I don't need to swap my ECU, I was kinda worried that the 02 ECU might have been flashed with an access port.  I read that you need to ground one of the ECU pins to trick it that it still has an automatic trans, true?

I lied about my car being stock, I have a couple small mods already.  One being a catless up-pipe so I have already done the resistor mod.  Second I have the stage 1 Cobb OTS map.  That's it for mods, for now...

Really appreciate the input.

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#4 2018-02-14 22:36:32

snowphun
Member
From: Central CT
Registered: 2005-11-09
User Number: 890
Posts: 598

Re: 2002 WRX Transplant, Can It Be Done?

Rodman wrote:

Totally doable, no wiring necessary. You can continue running your original ecu, it works with the manual transmission.

I haven't done an auto to manual swap, in part because it looks like most people swap the entire vehicle wiring harness. If you skip that there are still numerous wiring issues to sort out, neutral switch, ignition lock, reverse and speed sensors...

OP, I would swap the engine and trans at the same time, you'll be repeating some steps if you make it into two projects.

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#5 2018-02-14 23:05:17

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

Re: 2002 WRX Transplant, Can It Be Done?

snowphun,

You're correct, I should do the engine and trans at the same time.  My logic is currently being driven by three double whiskies as I'm away from home on a business trip big_smile

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#6 2018-02-15 08:38:03

krazykarguy
Worst ninja editor, ever.
Supporter
From: South of North Carolina
Registered: 2007-04-06
User Number: 1944
Posts: 8643

Re: 2002 WRX Transplant, Can It Be Done?

TrailerParkNinja wrote:

I lied about my car being stock, I have a couple small mods already.  One being a catless up-pipe so I have already done the resistor mod.  Second I have the stage 1 Cobb OTS map.  That's it for mods, for now...

Really appreciate the input.

Cobb stage 1 will eliminate the P0456 heat sensor code that the UP swap causes. No need for a resistor, just leave the cable/plug dangling.


2005 Aero 5MT
2014 Ford Mustang GT Premium 6MT - Sterling Gray Metallic

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#7 2018-02-18 03:04:25

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

Re: 2002 WRX Transplant, Can It Be Done?

Hey k,

So I did the resistor mod before I got my access port and I did not know the stage 1 map would take care of that.  I did ask a Subaru forum if I still needed the resistor and was told yes, but also go a lot of flack for asking.

Truly love this forum for not yelling at someone for asking a dumb or repeated question.

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#8 2018-02-18 08:26:02

krazykarguy
Worst ninja editor, ever.
Supporter
From: South of North Carolina
Registered: 2007-04-06
User Number: 1944
Posts: 8643

Re: 2002 WRX Transplant, Can It Be Done?

arrow-up it will happen eventually, don’t you worry...


2005 Aero 5MT
2014 Ford Mustang GT Premium 6MT - Sterling Gray Metallic

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#9 2018-02-18 16:27:19

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 2527

Re: 2002 WRX Transplant, Can It Be Done?

Is the swap done yet ?


2005 satin gray metalic aero, sold. 06 wrx, adios!
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2005 desert silver aero, work horse JDM EJ205 AVCS
2002 bugeye, sedan :-( new project

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#10 2018-02-21 13:32:16

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

Re: 2002 WRX Transplant, Can It Be Done?

Rodman wrote:

Is the swap done yet ?

Not yet, not even close  big_smile

I just received the parts last Friday and am now in major need to clean my garage before I begin to teardown the donor engine.  As well I'm starting to look up all the items needed to do a refresh on the engine and plan some small engine mods.  I'm not looking to build a HP monster, really, this is more of a budget build to gain experience and enjoy a hobby.

I'll look and or ask in another post but if anyone has recommendations on what I can do to improve/tweak the EJ205 I'm all ears.  So far I'm planning on keeping all the internals stock and doing small things like DIY TGV deletes, higher flow injectors/fuel pump, sightly larger turbo than the TD04, turbo back exhaust and an OTS map.  For now...

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#11 2018-03-13 22:41:00

jdm_65
Member
Registered: 2018-03-13
User Number: 45505
Posts: 1

Re: 2002 WRX Transplant, Can It Be Done?

I've got a 4EAT as well! Super stoked for this project and would love to STI swap some day lol

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#12 2018-03-19 00:23:52

TrailerParkNinja
Member
Registered: 2015-07-26
User Number: 32504
Posts: 68

Re: 2002 WRX Transplant, Can It Be Done?

Hey 9-2x,

I know it's been stated that I can use my current '05 auto trans ECU for my '02 engine/manual trans swap.  I live in a part of Nevada where we have yearly emission testing.  With any vehicle that has OBD2 they will use this interface to read possible codes, idle RPMs, emission related output readings and if supported VIN/mileage.  But I have a few questions that I seem to find contradicting answers to.
• Are there any performance issues/incompatibilities using my auto trans ECU?
• Can the VIN and or milage be read through the OBD2 on an '05?
• Where is the VIN stored and can it be changed by myself or a tuner?
• Is the milage stored in the gauge cluster and can it be changed by myself or a tuner?

Also just to add pieces to this puzzle I have now obtained the following in addition to all the other '02 items listed in my first post.  I'd like to use the below items rather than the '02 versions as they will be if the car was built from factory to be a manual.
• '05 9-2x manual gauge cluster
• '05 engine compartment harness
• '05 manual bulkhead harness

Thanks for all the help!

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