RSTi 6SPD Swap Questions

[CambridgeRS]

Originally Posted by Brydon

No way!!! Only 17" rims will fit and a lot of them will not clear.

This project is getting more expensive by the minute...lol!

Alright....I guess I may as well add 18" Gram Lights to this mess if I'm going to mortgage the house! Ha! Ha!

[Combat Chuck]

Originally Posted by Rob T

To use the R180 rear diff, you're going to need R180 rear hubs. The Ver 6 STi had R180 hubs that fit the 2pots, your R160s won't work.

Thanks for that Rob. From what I've read, my 06/07 2 pots are identical to the JDM GC STI 2 pots, so they'd bolt on to JDM R180 GC hubs?

[Rob T]

They should bolt right up, the calipers are the same with the exception of raised lettering on the JDM ones and stickers on the USDM ones.

[Combat Chuck]

Got it. This is making a lot more sense. Basically, I don't want to widen my track, and I don't want to have STI axles hanging out at more of an angle or anything. The way I see it now, to do it ideally (for me at least) I'd need JDM Ver 6. STI axles and hubs, then I could use a USDM R180 bolted up to it?
If that's true, what about rear rotors? Will the 06/07 2 pot rotors work on the R180 GC hub? And what about the Ebrake cable?

[pezcore]

I knew this thread would help more than just myself let's keep it going!

[Combat Chuck]

Sorry pezcore, I'm not trying to hijack if that's not what you're intending to do My thought is there's gotta be a better way to do an STI 6 speed swap while still maintaining 5x100 4/2 pots than putting a weaker R160 diff in the rear. Hopefully this won't be too much more expensive either

[pezcore]

No no I'm totally with ya, the more information the better. I'm in the middle of the same thing (hence the thread) with wanting to go 6SPD and keep 5x100 and JDM 4/2 pots.

My plan is to use as much from an 04 STi as possible (since they used 5x100)

[jaykhang]

the concern i want to know is can you just use the stock rs drive shaft and stock rear diff?

[Mad Ra88it]

Originally Posted by jaykhang

the concern i want to know is can you just use the stock rs drive shaft and stock rear diff?

No.
Please read above.

This has been answered a few times.

And many/most of the options & ways to do it are above.

[rbednarik]

Wow, there's a lot of confusing information here...not to mentioned it is scattered all around.

Having worked on and owning a GC with a 6mt, r180, and FHI 4/2pot brakes, here's what to use for the easiest and most reliable swap (in my opinion).

Going by the OP's setup (FHI 4/2pots and 5x100pcd):

Drivetrain:
-STi 6 speed (any year will work, but early 04 would be best since they have the stubs for the front axles)
-STi r180 (make sure the final drive matches the trans
(USDM ratios: 04-05=3.90, 06+=3.545)
-STi driveshaft
-USDM STi Front axles (match to trans type)**
**5MT axles will work as well, but you must match them to the trans style (see here)
-JDM GC R180 rear axles* (available new from Rallispec)
*(USDM rear axles will work, but the difference in track widths may cause issues with the CV joints later on)
-Manual DCCD controller (or replace the DCCD center diff with a 50:50 viscous coupling from a Legacy spec B)

Brakes:
-FHI 4/2 pot brakes
-FHI Grp. N Gravel rotors (made to fit over the r180 parking brake while retaining the 2 pot rotor size)*
* Available from Rallispec
-R180 parking brake assembly


That's all I can remember at the moment, If I forgot anything, be sure to let me know and I will add it on to the list.