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Old 11-04-2018, 10:49 PM   #1
audavid
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Default 2011 STi drivetrain into 98 2.5 RS

I have a 2011 STI donor car that i want to put into my 1998 impreza 2.5RS. I know is not the easiest drivetrain to do the swap but I just want to see if anyone done it before? If its too difficult would just swapping the engine be possible? Thanks a lot for any help, Please give me some advice
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Old 11-06-2018, 04:19 PM   #2
subtle_smoker
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What exactly are you trying to swap? Engine, transmission and rear diff wouldn't be too difficult, but hubs, brakes and suspension might be. I know a good bit of GD items bolt on, but unsure about the GR. Instrumentation would be a bigger issue. Easiest swaps retain the cluster and ECU from the swapped engine. Just splice the rear portion of the RS harness into the majority of the '11 harness or you'll have some work cut out to make the RS cluster read properly.
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Old 11-08-2018, 11:02 AM   #3
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Originally Posted by subtle_smoker View Post
What exactly are you trying to swap? Engine, transmission and rear diff wouldn't be too difficult, but hubs, brakes and suspension might be. I know a good bit of GD items bolt on, but unsure about the GR. Instrumentation would be a bigger issue. Easiest swaps retain the cluster and ECU from the swapped engine. Just splice the rear portion of the RS harness into the majority of the '11 harness or you'll have some work cut out to make the RS cluster read properly.
The brakes and suspension i will probably sell them. The engine, transmission and rear diff would like to swap as much as possible. It seems to be a very tough job, not much shop is willing to do this job
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Old 11-08-2018, 09:36 PM   #4
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This really belongs in the conversion section and you will find MUCH guidance with a little bit of poking around in there.

Long story short, I think the getting the dual AVCS working will be the issue. If you use a donor 04-07 STi harness and ECU, I know the merge has been done many times.

I don't know of anyone with a swap of an 08+ STi into an older chassis without a standalone due to the canbus.

The 2011 also uses the wheel speed sensors for vehicle speed to ECU and not the sensor from the trans. Your 2011 trans does not have the provision for the sensor. DCCD-Pro has a kit for this particular work around.

Front brakes are a direct swap but the rear calipers and rotors had a different off-set. I'm not sure if anyone actually has made a bracket to adapt them to the older style hubs.

Diff swap is simple. Rear axle options will depend on which hubs you want to run.

It would do you well if a moderator would move this to conversion, or just start digging through there.
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Old 11-09-2018, 11:22 AM   #5
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Originally Posted by Homemade WRX View Post
This really belongs in the conversion section and you will find MUCH guidance with a little bit of poking around in there.

I don't know of anyone with a swap of an 08+ STi into an older chassis without a standalone due to the canbus.

The 2011 also uses the wheel speed sensors for vehicle speed to ECU and not the sensor from the trans. Your 2011 trans does not have the provision for the sensor. DCCD-Pro has a kit for this particular work around.
I agree with moving this to the conversion section or at least poking about in there. There's a wealth of knowledge available, and I'm sure someone has at least looked into swapping a dual AVCS motor into a GC chassis.

Could you not bypass the canbus issue with a wiring merge to use the new ECU? I'm sure iWire could make this happen. I honestly feel like retaining ABS function would be the bigger issue if you wanted to keep Subaru's arguably terrible ABS without swapping the GR manifold and plumbing some new lines.
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Old 11-09-2018, 07:20 PM   #6
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I know it CAN be done but I don't think anyone has, with the use of the stock 08+ ECU. Easiest means would be to pretty much merge the entire 11 electronics (gauge cluster, sport plus controller, ABS distro block, fuel tank sensors, and all) into the GC chassis. It would be like a central nervous system swap into a new body. Then you just cut and splice in to adapt lights and where you have too much harness length.

I know i-wire already did this merge with a 2015 WRX but they still aren't making it publicly available. I've been asking.
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Old 11-12-2018, 08:54 PM   #7
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Quote:
Originally Posted by subtle_smoker View Post
I agree with moving this to the conversion section or at least poking about in there. There's a wealth of knowledge available, and I'm sure someone has at least looked into swapping a dual AVCS motor into a GC chassis.

Could you not bypass the canbus issue with a wiring merge to use the new ECU? I'm sure iWire could make this happen. I honestly feel like retaining ABS function would be the bigger issue if you wanted to keep Subaru's arguably terrible ABS without swapping the GR manifold and plumbing some new lines.
you also have to remember that there are a bunch of systems on the 08+ that are not on the older gc bodies. like the vdc and stuff. so getting all that stuff working is going to be a lot of wiring time. but yeah canbus really makes things a lot harder than it used to be.
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Old 11-12-2018, 09:16 PM   #8
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I have seen an 08+ wrx engine swap into an older car, with the cluster and harness and ecu and all that, so I assume that part and getting the dual avcs working is also possible in a gc. It was a 3rd gen legacy (well, baja actually) but I assume the process would be about the same.

rear suspension/subframe stuff is not even close, will not work. and no, there is not a bracket for those brakes on an older hub. Front control arms also a no. Front subframe, steering rack, I think will go in, but inner tie rods are too long. There are adapters to use the shorter tie rods for narrower cars.

But yeah starting with a GD sti lets you swap everything from the subframes to the hubs and suspension.
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