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Old 04-13-2009, 11:02 PM   #1
207STi
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Member#: 197062
Join Date: Dec 2008
Chapter/Region: NESIC
Location: Vermont
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1998 Swapped Impreza
black

Default 06+ swap into a GC

So for the past couple months I've been researching swapping and ej205 into my 97 impreza L. Today I started reading about the ej255 that come in the 06+ wrxs and I got to thinking. I tried researching to see if there were any documented swaps but only found one thread of note that dresses some issues. The thread said there was the issue of the immoblizer (fixable with an 04 sti ecu?), different speed sensor, and transmission mount.

Realising that these motors put out a ton of torque I've started seriously considering an sti 6mt conversion as well.

So pretty much the overall plan is:

-ej255 motor+Accesories
-06 wrx crossmember
-sti 6mt (stock clutch)
-Possibly an avcs controller
-auto wrx axles for the front?
-Sti Rear differential
-Rear axels?
-Lgt brakes or something comprable
-Other Items associated with the swap misc
stuff like fuel pump, ps pump, and brake booster

I'm really not a 100% on if all of these things are compatible with eachother, so if you guys could let me know what some possible issues/difficulties I may encounter trying to do this.


P.S. Threat I got some info from:


http://forums.nasioc.com/forums/show...highlight=2006

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Old 04-14-2009, 10:45 AM   #2
207STi
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bump..
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Old 04-14-2009, 05:53 PM   #3
JRach
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I've done a 03' usdm wrx swap into my 96' impreza wagon, and just finished an 06' usdm wrx swap into my friends 02' impreza TS wagon. (i like wagons)

I might be able to help a bit...

-ej255 motor+Accesories
Start with a full wrecked car, it's cheaper in the long run, and you wont have to hunt down/spend extra money on parts

-06 wrx crossmember
Any usdm wrx crossmember will do

-sti 6mt (stock clutch)
6spd would be nice, but maybe start with the 5spd, get the car running right then swap in the 6spd after
(there's some JDM 6spds that dont use DCCD and can make things a little easier on ya (and they're cheaper))

-Possibly an avcs controller
If you're starting with an entire usdm 06+ wrx just use the ecu it comes with

-auto wrx axles for the front?
? auto axles... just use the parts from the donor car. Sedan axles will work with GC control arms. Better yet, use the 06+ aluminium control arms, wrx axles and adjust the extra negative camber back into spec with camber bolts/plates

-Sti Rear differential
Again, use the wrx stuff, then do a 6spd if ya want down the road

-Rear axels?
Again, wrx axles will work fine.

-Lgt brakes or something comprable
06' wrx brakes are GREAT brakes when used with decent pads, lines and fluid!
Another reason to find an entire donor car!

-Other Items associated with the swap misc stuff like fuel pump, ps pump, and brake booster
Fuel pump/fuel tank
For both of my swaps i swapped over the entire gas tank into the car. It bolts right in along with all the emmissions crap. Fuel pump stays in the tank, i even swapped the fuel hardlines that came from the donor car (the ones that run from the engine bay to the gas tank along the drivers side floor board)

PS pump, use the one from the wrx donor car. You don't even need to disconnect it from the motor.

Brake stuff- i wanted to keep/retain everything from the donor car so i even swapped the wrx brake booster. It bolts right in. I also used all the wrx hard lines for the brakes and ABS system from the wrx. The hard lines can be made to fit the GC engine bay with a little bending (just don't crimp them) My car didn't have ABS, now it does Use the original brake hardlines that run to the rear brakes, no need to swap those.

Wiring- I used the ENITRE wrx wiring harness, and just made it fit into my GC. This allows you to not have to worry about splicing difficult things into your existing GC harness (ABS, fuel pump controller, etc etc)
I swapped the dash (i advise you not to) so it cut back a bit on wiring for me, but you'll only need to splice easy things such as heater controlls, gauge cluster, door wiring plugs and headlights/taillights/turn signals.

Random stuff-

Immobilizer- No need to go w/ a 04' sti ecu. Get a whole donor car, use the ECU, Immobilizer box (attatched to steering column), and the light up ring surrounding the ignition (has antenna in it). For the key you can either... keep the 06' key on your key ring and use your existing key, or use the VIN to order a key blank from Subaru that has the chip in it for your vehicle (the donor car) and have it cut to match your existing key. Again, another reason to use the Whole WRX wiring harness.

Pedal box- I'm not sure if you're donor car has a hydraulic clutch or not. My 96 wagon did not. If you don't you'll need to find a GC RS hydraulic clutch pedal box.

Gas pedal- The 06' has electronic throttle control (drive by wire). The gas pedal mounts completly differently and wont just bolt in place. (another reason to start with a complete donor car) You'll need to get a thin plate of metal and line up the plate to your existing gas pedal mount. Then drill the holes for it, and mount the 06' pedals top hole into the existing top hole on your firewall. Use a sunken bolt to mount the plate to the existing lower hole on the firewall. Then the 2nd (lower) hole on the 06' pedal will be mounted to a hole you drill on the plate you made. (left of the existing lower firewall mount)

That's all i can think of now... but if ya have any questions feel free to PM me...
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Old 04-14-2009, 09:36 PM   #4
207STi
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1998 Swapped Impreza
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Thank you for such a lengthy response.

The reason I was saying auto wrx front axles and rear sti differential was to go along the the 6mt swap.


Any other people with first hand experiance?
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Old 04-15-2009, 10:15 AM   #5
Jaxx
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jay is right on in his response .. to the point of it should almost be stickied


sti rear end is hitachi R180 it uses different diameter axles (stronger)
the bugger is that the hub side of the axles is also larger
sooo you need either sti hubs (most of which are 5x114) and brembos $$
or custom drive shafts that are r180 at the diff and r160 at the hub $$$

buy a complete 06
swap the car with the 5mt .. then buy a 6 speed
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Old 04-15-2009, 06:13 PM   #6
207STi
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how well do you think the 5mt will hold up to the torque this motor puts out with a decent size turbo? (thinking 20g in the future)
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Old 04-15-2009, 06:47 PM   #7
JRach
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Quote:
Originally Posted by Fooliojesus View Post
how well do you think the 5mt will hold up to the torque this motor puts out with a decent size turbo? (thinking 20g in the future)
Plenty of people have a 2.5 wrx w/ larger turbos and have no problems.

Then again, plenty of people with 'just' the torque of a 2.0 liter break their trannys.

Sure the 5 spd. isn't as strong, but i think 90% of breaking your transmission is how you drive.
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