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Old 09-08-2012, 06:41 AM   #1
Gunplay
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Default 09 STI engine swap into 05 wrx ? ( problems and requirements )

Basically I blow my 05 wrx motor so instead of just fixing it I thought I would up great and go with an STI motor now. I got a 09 STI complete motor with the harness and everything except the ecu, now I was thinking everything would be plug and play but I started doing research and it seems no one has done this before also there is a lot of different opinions on what you have to do to make this work. So basically I would love to know exactly what I have to do to run this ej257 in my wrx with the STI ecu ?


Thank you for all the help guys !!!
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Old 09-08-2012, 03:11 PM   #2
WRX2EVOX
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I'm in the same boat, I really want to pick up a '11 STi off copart and swap the drivetrain but there is little to no info on what is involved with GR to GD comparability. I have seen threads about the transmission process but nothing for the long block/ wiring/ ecu install. Someone's gotta have some insight!
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Old 09-08-2012, 05:00 PM   #3
old_duwel
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that would be interesting to know.. i am sure you can do it.. check with Iwire and see if he can do it!
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Old 09-08-2012, 05:40 PM   #4
Gunplay
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Quote:
Originally Posted by WRX2EVOX View Post
I'm in the same boat, I really want to pick up a '11 STi off copart and swap the drivetrain but there is little to no info on what is involved with GR to GD comparability. I have seen threads about the transmission process but nothing for the long block/ wiring/ ecu install. Someone's gotta have some insight!
that is actually a great idea thought about it my self just never had the space for another car. but yeah we'll see if anyone can shed some light on this for us.



Quote:
Originally Posted by old_duwel View Post
that would be interesting to know.. i am sure you can do it.. check with Iwire and see if he can do it!
thank you i didn't even know about him until now i got his number ill give him a call monday and see what he thinks
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Old 09-08-2012, 05:48 PM   #5
WRX2EVOX
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Sent him an email, let's see what he says
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Old 09-08-2012, 06:28 PM   #6
WRX2EVOX
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His response so far:


Thanks for contacting me. Because the 08+ GR is a CANBUS system, it makes the swap pretty complicated wiring wise. The whole point is to get the GR ECU to work because it can control the dual AVCS. In order to do that you need to make it happy and that really isn't possible unless the CANBUS sees every sensor throughout the car working properly. Your best options is to swap everything over, wiring/dash/hubs/trans/etc. Not sure how the GR dash would fit in a GD, but probably would fit better than the couple attempts I've seen in GCs. I'm working on trying to figure out how to do a GR swap without doing all that, but it's going to take some serious electronic trickery to make the ECU happy if it is merged in like you would do for any 07 or older swap.

Thanks,
Brian



Let's hope he can figure out a solution
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Old 09-08-2012, 08:32 PM   #7
Gunplay
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Quote:
Originally Posted by WRX2EVOX View Post
His response so far:


Thanks for contacting me. Because the 08+ GR is a CANBUS system, it makes the swap pretty complicated wiring wise. The whole point is to get the GR ECU to work because it can control the dual AVCS. In order to do that you need to make it happy and that really isn't possible unless the CANBUS sees every sensor throughout the car working properly. Your best options is to swap everything over, wiring/dash/hubs/trans/etc. Not sure how the GR dash would fit in a GD, but probably would fit better than the couple attempts I've seen in GCs. I'm working on trying to figure out how to do a GR swap without doing all that, but it's going to take some serious electronic trickery to make the ECU happy if it is merged in like you would do for any 07 or older swap.

Thanks,
Brian



Let's hope he can figure out a solution

wow sounds like this is going to be a big problem for me if he cant figure out a way to make the GR ecu work with all the sensors in the GD. and thank you WRX2EVOX for posting his response.
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Old 09-08-2012, 10:12 PM   #8
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^^^^ No worries, more info for everyone the better. Also found some good reading on the CANbus system on RS25

http://www.rs25.com/forums/f128/t143...rm-thread.html

The trick is having the whole donor car at your disposal to be able to swap everything over. It's definately going to be some tedious work, but not fully impossible. Give it some time for some of the more experienced players to work everything out and I'm sure there will be a solution.
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Old 09-09-2012, 05:05 AM   #9
Gunplay
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Quote:
Originally Posted by WRX2EVOX View Post
^^^^ No worries, more info for everyone the better. Also found some good reading on the CANbus system on RS25

http://www.rs25.com/forums/f128/t143...rm-thread.html

The trick is having the whole donor car at your disposal to be able to swap everything over. It's definately going to be some tedious work, but not fully impossible. Give it some time for some of the more experienced players to work everything out and I'm sure there will be a solution.

yeah thats where i read about the cambus my self. i would love to the the whole car to my disposal it wouldnt be a problem to swap everything over really tedious but worth it if you ask me. if no one finds a solution soon i will have to pull my heads off and sell them then get wrx heads with aftermarket springs with 272 cams i hear its even better then the sti heads but that would be my last resort i would like the keep the EJ257 complete.
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Old 09-09-2012, 05:55 AM   #10
WRX2EVOX
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Dude search Copart! Seriously for the cost of a long block u can have a whole car. Unfortunately, or well fortunately I guess, my finances are going towards a new house right now so once that is settled I need to pick up a beater DD an park the wrx for an extensive tear down then get the donor car in and start the mad scientist swap. Hopefully when that time comes there will be more light shed on this subject.

Realistically we can keep our GD dash if we can find a way to fit all the sensors/ wires behind it. Fab up a custom bracket/ shroud for the gauge cluster, the trans/rear diff/hubs/axles info from the trans sticky and vsspro from DCCDPRO sorts out the speedometer and trans swap. So it's a matter of swapping out the full harness front to back and getting all the technology crammed into our GD's and re-pinning some of the plugs. Sounds easy-ish, these EZ30R guys have had a hell of a time and figured it out so why can't we.
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Old 09-11-2012, 11:18 PM   #11
Gunplay
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Quote:
Originally Posted by WRX2EVOX View Post
Dude search Copart! Seriously for the cost of a long block u can have a whole car. Unfortunately, or well fortunately I guess, my finances are going towards a new house right now so once that is settled I need to pick up a beater DD an park the wrx for an extensive tear down then get the donor car in and start the mad scientist swap. Hopefully when that time comes there will be more light shed on this subject.

Realistically we can keep our GD dash if we can find a way to fit all the sensors/ wires behind it. Fab up a custom bracket/ shroud for the gauge cluster, the trans/rear diff/hubs/axles info from the trans sticky and vsspro from DCCDPRO sorts out the speedometer and trans swap. So it's a matter of swapping out the full harness front to back and getting all the technology crammed into our GD's and re-pinning some of the plugs. Sounds easy-ish, these EZ30R guys have had a hell of a time and figured it out so why can't we.

yeah man i understand where your coming from i just got a house my self but right before that my motor blow up so now im in kinda of a hurry to get my subie up and running looks to me like im gonna have to sell my sti heads and harness get some wrx ones and go stage 2. hopefully one day ill have the space, time and money to strip two cars and make my wrx a full sti. Keep me posted on your progress tho i would love to know what you ended up doing. and i will do the same might even post up some pics
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Old 10-18-2012, 06:20 PM   #12
MMY MSL
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I've been reading about the 2008 wrx blocks trying to answer a similar question, maybe someone on here can comment or point me in the right direction:

A 2008 WRX uses essentially a 2007 STI single AVCS cylinder header, and basic semi closed block, but it's ECU and wiring is all CANbus...

Mechanically are there any differences between the 2008 WRX ej255 and the 2004-2007 STI ej257 cylinder heads and blocks???

Bottom line: Electronically is it conceivable to plug in 04-07 STI harness, ecu and intake manifold and TB to make the 08 engine play nice?

My instincts tell me that the sensors found in the 08+ ej255 may be different, but IDK, it's hard for me to say when I've found so little information out there about any differences in the ej255 v2 motor, other than the fact that it has a canbus ECU controlling it.

I'm asking because I have a 2008 WRX motor I'm buying and want to know what kind of parts I'll need off of an older STI to make it all work.
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Old 11-20-2012, 11:55 AM   #13
slowgenius
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In order to use my built 2.5 motor with 2008 sti heads and dual avcs in my 04 wrx, i am retaining the stock ecu for passing emissions, and using a V88 vipec to run the engine.

I purchased the standalone version. I will update when it arrives and i make some progress. I believe this is the easiest way to go.

If you sell the dual avcs heads, and get the single avcs heads you can use any 04-07 usdm sti ecu and the wrx wiring harness with 4 wires added for the avcs and call it a day.
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