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Old 05-13-2012, 09:05 AM   #1
A.0.spin
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Join Date: Aug 2009
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Location: Norfolk VA
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04' STI
blue like the boy

Default rear subframe swap

I need a little help. I am looking at swapping a JDM 06-07 sti subframe into my 04 sti. As far as I can tell so far the two should be compatible. Any reason this shouldn't work? The subframe lockdown bolt appears to not exist on my 04 subframe.

The reason I am doing this is because mine is very rusted and rather than allow it to continue to rust out, since I am swapping in new hubs, bushings etc, just want to swap the entire subframe.
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Old 05-17-2012, 11:59 AM   #2
Samurai Jack
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I would say they are the same.

I was looking to swap an entire 06 STi rear subframe into my '02 but was told that the subframes are exactly the same.
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Old 06-14-2012, 07:40 AM   #3
Vlad
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Sti V9 Spec C

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They are not exactly the same.
The WRX has rubber bushings, the Sti has metal spacers.
The subframe locks were created to give the WRX what the Sti already has. However locking on 4 points is different than 2 points, reliabillity-wise.
There were aluminum "bushings" being sold for the WRX to be pressed in place of the rubber bushings.
There were threads back in '02-04 about people installing these and it was difficult....

It is also possible that an early '04 Sti may still have rubber bushings and only an '05+ Sti is guaranteed to have metal spacers.

From what I recall from those early threads, they do make a difference, just like subframe lock bolts do.
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Old 06-14-2012, 07:59 AM   #4
jdmjeb
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Dang dude! Vlad I think I learn something new every time i read one of your posts. I am currently putting a "v7" swap in my bugeye and could use any knowledge that you may have concerning the subject. Thanks again for the posts.
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Old 06-14-2012, 09:23 AM   #5
Vlad
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You're welcome. Let me know what your concerns are with the V7.
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Old 06-15-2012, 09:34 AM   #6
Samurai Jack
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Quote:
Originally Posted by Vlad View Post
They are not exactly the same.
The WRX has rubber bushings, the Sti has metal spacers.
The subframe locks were created to give the WRX what the Sti already has. However locking on 4 points is different than 2 points, reliabillity-wise.
There were aluminum "bushings" being sold for the WRX to be pressed in place of the rubber bushings.
There were threads back in '02-04 about people installing these and it was difficult....

It is also possible that an early '04 Sti may still have rubber bushings and only an '05+ Sti is guaranteed to have metal spacers.

From what I recall from those early threads, they do make a difference, just like subframe lock bolts do.
So, when you say rubber bushings are you referring to the outrigger bushings or something else?

If it is the outrigger bushings, then it would be easier to simply replace them with the TiC race outrigger bushings, which are almost a solid bushing, Shore95A on a scale of Shore100A, and/or add the subframe locks.

I'm just looking at it from a workload/financial viewpoint.
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Old 06-15-2012, 10:51 AM   #7
Vlad
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I can't see any diagrams in here from work.
The outrigger is the piece with two long arms that fasten the front of the differential housing. That has two bolts that tie it to the chassis/one on each side, via 3" (or so) rubber bushings.

http://www.rallispec.com/prod_chart_stibush1.htm

The rear subframe is the piece that bolts the lateral links to and the rear differential cover. It bolts to the chassis via two bolts on each side, going through 1 inch rubber bushings.

To upgrade that, you can use the subframe lock bolts, or you can change the bushings with aluminum spacers. The 05+ Sti that already has metal there, may have steel spacers, or aluminum.
The outrigger bushings are not for that.
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