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Old 10-11-2011, 10:30 PM   #1
naCAnItihS
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Default Questions on 05 LGT motor to 04 WRX

ok so I am prob picking up an 04 wrx with a blown motor and currently have my totaled (cosmetic) 05 LGT w/ 85k on it. I am considering swapping the full drive train into the wrx.

I work on subarus everyday so i know my way around the car. I just have never swapped a EJ255 into a car with an EJ20.

I dont mind doing some wiring changes but i really dont want to have to pull the interior to get at that harness.

I have done a bunch of searching and I cant find the answer I am looking for.

Can I just pull the LGT motor and trans and pop them into the wrx using the lgt engine harness and ecu? What modifications will be needed? or should I try to use some of the wrx wiring?

Both cars are 5mt btw. I am just trying to figure out if it is worth the hassle or should i just find another EJ20 throw it in and call it a day?

Thanks for your help!
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Old 10-12-2011, 06:50 PM   #2
Tatmana
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The EJ255 longblock will bolt in. Use your 2l intake manifold. Get a cosworth cam sensor adapter and you are good to go. Get a tune.
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Old 10-13-2011, 12:26 AM   #3
naCAnItihS
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Are there any issues with using the Lgt ecu? I was hoping to be able to use everything like the i/c and turbo.. But I guess that can't happen due to the tb in the Lgt being drive by wire and the Wrx being cable?
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Old 10-14-2011, 09:12 PM   #4
Tatmana
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Use the intake manifold and throttle body from the 04 WRX. You can use the stock ECU. Just need a tune for everything to work well. I have tuned a few of these with VF series turbos. PM me for a base map. $$
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Old 10-15-2011, 08:31 PM   #5
kaos200
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Except with that method he won't be able to run avcs and it will still be running the older style ecu.
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Old 10-17-2011, 11:20 PM   #6
naCAnItihS
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well how would I be able to run the avcs?

I have both complete cars btw
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Old 10-21-2011, 12:07 AM   #7
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anyone?

so basically i just need to use the 04 wrx intake manifold, harness, ecu and tb?

I would like to have the avcs working. Also whats with this cosworth cam sensor?? why would I need that?

as for the trans. will I need anything special for the speedo and tach to work properly?
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Old 10-21-2011, 12:07 AM   #8
naCAnItihS
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double post...
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Old 10-24-2011, 12:58 AM   #9
naCAnItihS
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bump for some answers... plz

i would really like to run the avcs.. i have searched a lot and have found many people asking the same questions with no answers...
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Old 10-24-2011, 09:00 PM   #10
shredboostnburn420
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if you wanna run avcs then your going to need to do a full swap including the full harness and ecu which is quite a bit of work compared to not running avcs and doing what the others said by swapping the TB and IM
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Old 10-25-2011, 06:31 PM   #11
Tatmana
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Running AVCS is cool but not worth the hassle. Your car will run awesome without it (if tuned properly).
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Old 10-25-2011, 09:22 PM   #12
naCAnItihS
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ya i have an awesome tuner so im not worried about that. I just like for things to work as they should and if it is there it should work.

well i guess im sol cuz i def dont want to have to tear apart both dashes. I am already doing a full swap in an 98 2.5rs with an 04 sti as a donor.

i just thought there was a way around that. I cant just cut out the avcs wiring and run it to the lgt ecu. with obv switching some of the pinouts? i prob will need to do the dbw too then?
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Old 10-25-2011, 09:42 PM   #13
BeBop86
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AVCS is worth it for lower to medium HP ranges, if you get heavy into a high HP build, most people do away with AVCS.

If you've got your Legacy doner car, do the full swap.

To have functioning AVCS, you either need the full swap, or a standalone ECU like Hydra (which is $$$)

It will be almost exactly what I did, but with different turbo/intercooler:

http://forums.nasioc.com/forums/show....php?t=2210256
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Old 10-25-2011, 10:56 PM   #14
theotherguy
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You'll also need to plug the avcs cams, run ej205 cam gears and cam seals with the wrx im for no avcs. Otherwise timing sucks. You may not need the bracket, I ran B25 heads with the wrx cam sensor as it still had the factory bracket on the head. Bolted it right on and ran fine with a wrx ecu after tune.
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