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Old 05-10-2020, 09:09 AM   #1
Yellowbeard
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Default Crash Course: 6MT into 2006 Limited Wagon

OK. This is my first Subaru and I lost 5th gear the other day. For reference, here's the car, which I bought on NASIOC from an awesome seller: https://forums.nasioc.com/forums/sho...php?p=46174055

From watching videos, reading lots of threads, asking questions, etc., this is where I am at right now and I am wondering if someone can tell me if it will work.

Note: I have reasonable mechanical experience but this is my first Subaru and I bought it modified. I am currently navigating the infinite LEGO box that is Subaru. I'd love help and advice. I know I may make mistakes which is why I am asking.

Below is the parts list I have put together after doing research.

Starting from the engine:

1. STI Pull type clutch and flywheel (there are lots of options). I have some questions about how this works given that I currently have a push type but I haven't seen a lot of discussions of problems with that so I am assuming it works somehow. Basically, if I am taking the transmission off, I am replacing the clutch (the car has 100k on it). Anyway, the push clutch I have won't work with an STI 6MT as far as I can tell. The current parts set I am looking at has a clutch with it.

2. Transmission - V8 JDM 6MT
The one I am currently looking at has MALE stubs. I am hoping I can use the front axles off of an 02-03 to transition from the male stub outs to the female hubs that I understand are on my car. If this will NOT work, I will have to pick a transmission with female inputs so I can use my Male/Male axles that came on the 06-07. My understanding (from watching the flatiron's videos several times) that it is fairly easy to go from 6MT to WRX hubs in the front. If it's possible to just REMOVE the male studs in the front drive portion of the JDM 6MT then I would do that and use my existing Male/Male axles.

3. Driveshaft. The one I am currently looking at comes with an STI driveshaft which I understand can work with slight modification (adding Subaru part# 38358AA040 (large bolt pattern)). If that WON'T work then I plan to acquire an AT drive shaft for this part.

4. Rear Diff: I plan to replace my existing rear diff (because it has a 3.70 final drive) with an R160. According to the thread I read, I need part number 38104AA010, which has a 3.90 rear diff. I know the R180 is better, but changing to R180 means I would have to change the hubs or do hybrid drive shafts. The one time I tried to repack bearings on my 1973 Porsche 914 it was a frickin' nightmare, so I don't want to build hybrids. If I could acquire some already built, I would consider getting an R180 to match. However, I am probably only putting out around 350 HP and my understanding is that the R160 can handle that. I can always change to the R180 later if I either change hubs or get hybrid shafts. edit: I also just read that I can actually do this with legacy spec b axles. In that case, I would certainly consider getting an R180 and using spec b axles to get out to my 06 WRX hubs.

Interestingly, I thought the R160 3.90 diff would be really easy to find but it seems to actually be quite difficult.

5. I have the Hubs that came on the car but I have 04 STI BBS wheels (5X100) over Brembos already so I don't really want to change out all the hubs.

6. DCCD controller, which I will need eventually. No clue what to do here. Advice appreciated.


What am I missing here? Any help is appreciated. I was going to just replace the 5MT with another (maybe upgraded) 5MT but having read a lot and heard lots of advice from several quarters I think that moving to 6MT might be better.

I'd appreciate any advice. Thanks to all the people who have written 6MT swap threads. They have been REALLY helpful in getting my mind around this problem (and I am a science teacher by day, so I REALLY appreciate being taught stuff well).

Thanks in advance.

YB
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Last edited by Yellowbeard; 05-10-2020 at 01:23 PM. Reason: added info, minor grammar changes
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Old 05-10-2020, 03:11 PM   #2
REX_WGN
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Hey YB,

You've put a lot of thought into this as it clearly shows. I'm sure others will chime in considering you were very detailed and not like the typical 1-liner asking how to do a 6-speed swap. I also have an 06 wrx, swapped with the 07 STI trans, auto driveshaft and 02-05 R160. I did everything else to my car except this swap; my job at that time just wouldn't allow it (no free time). Good luck.

Quote:
Originally Posted by Yellowbeard View Post
OK. This is my first Subaru and I lost 5th gear the other day. For reference, here's the car, which I bought on NASIOC from an awesome seller: https://forums.nasioc.com/forums/sho...php?p=46174055

From watching videos, reading lots of threads, asking questions, etc., this is where I am at right now and I am wondering if someone can tell me if it will work.

Note: I have reasonable mechanical experience but this is my first Subaru and I bought it modified. I am currently navigating the infinite LEGO box that is Subaru. I'd love help and advice. I know I may make mistakes which is why I am asking.

Below is the parts list I have put together after doing research.

Starting from the engine:

1. STI Pull type clutch and flywheel (there are lots of options). I have some questions about how this works given that I currently have a push type but I haven't seen a lot of discussions of problems with that so I am assuming it works somehow. Basically, if I am taking the transmission off, I am replacing the clutch (the car has 100k on it). Anyway, the push clutch I have won't work with an STI 6MT as far as I can tell. The current parts set I am looking at has a clutch with it.

2. Transmission - V8 JDM 6MT
The one I am currently looking at has MALE stubs. I am hoping I can use the front axles off of an 02-03 to transition from the male stub outs to the female hubs that I understand are on my car. If this will NOT work, I will have to pick a transmission with female inputs so I can use my Male/Male axles that came on the 06-07. My understanding (from watching the flatiron's videos several times) that it is fairly easy to go from 6MT to WRX hubs in the front. If it's possible to just REMOVE the male studs in the front drive portion of the JDM 6MT then I would do that and use my existing Male/Male axles.

Is there a particular reason you want the V8 JDM 6MT? Have you considered the 07 STI one with a taller 4th (or 3rd), can't remember, and has a better cooling system than previous models.

3. Driveshaft. The one I am currently looking at comes with an STI driveshaft which I understand can work with slight modification (adding Subaru part# 38358AA040 (large bolt pattern)). If that WON'T work then I plan to acquire an AT drive shaft for this part.

4. Rear Diff: I plan to replace my existing rear diff (because it has a 3.70 final drive) with an R160. According to the thread I read, I need part number 38104AA010, which has a 3.90 rear diff. I know the R180 is better, but changing to R180 means I would have to change the hubs or do hybrid drive shafts. The one time I tried to repack bearings on my 1973 Porsche 914 it was a frickin' nightmare, so I don't want to build hybrids. If I could acquire some already built, I would consider getting an R180 to match. However, I am probably only putting out around 350 HP and my understanding is that the R160 can handle that. I can always change to the R180 later if I either change hubs or get hybrid shafts. edit: I also just read that I can actually do this with legacy spec b axles. In that case, I would certainly consider getting an R180 and using spec b axles to get out to my 06 WRX hubs.

Interestingly, I thought the R160 3.90 diff would be really easy to find but it seems to actually be quite difficult.

Your required R160 to match your trans will hold up just fine.

5. I have the Hubs that came on the car but I have 04 STI BBS wheels (5X100) over Brembos already so I don't really want to change out all the hubs.
No issues with your hubs.

6. DCCD controller, which I will need eventually. No clue what to do here. Advice appreciated.
There's got to be a wiring DIY thread on this forum. If it wasn't here, then maybe over at clubwrx.net.


What am I missing here? Any help is appreciated. I was going to just replace the 5MT with another (maybe upgraded) 5MT but having read a lot and heard lots of advice from several quarters I think that moving to 6MT might be better.
-6-speed shifter, linkage assembly, shift knob. If you are doing all of this yourself, then you might as well upgrade the front shifter bushing since you're in there already. I also think the shift linkage with bushings is also different.
- 6 speed trans mount


I'd appreciate any advice. Thanks to all the people who have written 6MT swap threads. They have been REALLY helpful in getting my mind around this problem (and I am a science teacher by day, so I REALLY appreciate being taught stuff well).

Thanks in advance.

YB
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Old 05-10-2020, 04:36 PM   #3
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Go to Rallispec and look up trans codes to find out what that pinion ratio is. Many of the rear diffs are actually a 3.54 with a 1.1:1 ration in the trans for a final drive of 3.90.


http://www.rallispec.com/downloads/T...art_Public.pdf

Match up you're trans code here and find the right diff.

Also, Insane Shafts builds CVs that will work with the R180 diff and the WRX hubs. Shoot them an email and they will set you up with the right part number. Their shafts are good for either 500hp or 1000hp depending on which you want.
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Old 05-10-2020, 04:37 PM   #4
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You can either run 02-04 (early) WRX wagon axles with that V8 JDM 6MT, or you can remove the axle stubs from the transmission (need a puller, the circlips keep them in there good), swap the seals to 04 (late)-07 style, and use your existing axles.

For a DCCD controller, go with either a DCCDPro or MapDCCD unit. Look at both to see which one fits your needs better. I run a DCCDPro personally on my V9 JDM 6MT swapped hawkeye WRX. I like that it integrates the OEM Subaru controls and allows you to wire it to your instrument cluster if you swap to one that displays DCCD.
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Old 05-11-2020, 10:02 AM   #5
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Quote:
Originally Posted by kenliu84 View Post
Hey YB,

You've put a lot of thought into this as it clearly shows. I'm sure others will chime in considering you were very detailed and not like the typical 1-liner asking how to do a 6-speed swap. I also have an 06 wrx, swapped with the 07 STI trans, auto driveshaft and 02-05 R160. I did everything else to my car except this swap; my job at that time just wouldn't allow it (no free time). Good luck.
Thanks for the info!

Frankly, I was looking at the JDM transmissions because I could get lower mileage ones cheaper. However, this is the second time now (thank you!) that someone has told me that their gear ratios are actually quite short (it's fine to see numbers, but that doesn't have the same qualitative information of someone saying "hey, you know you're going to be shifting all the time and that 6th gear is still going to be revving really high, right?").

So now, given information I've gotten now from two sources, you being one of them, I am reconsidering.

I appreciate your time and the compliment!
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Old 05-11-2020, 10:05 AM   #6
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Quote:
Originally Posted by 03SubyWRX View Post
You can either run 02-04 (early) WRX wagon axles with that V8 JDM 6MT, or you can remove the axle stubs from the transmission (need a puller, the circlips keep them in there good), swap the seals to 04 (late)-07 style, and use your existing axles.

For a DCCD controller, go with either a DCCDPro or MapDCCD unit. Look at both to see which one fits your needs better. I run a DCCDPro personally on my V9 JDM 6MT swapped hawkeye WRX. I like that it integrates the OEM Subaru controls and allows you to wire it to your instrument cluster if you swap to one that displays DCCD.
Thanks! I feel like I am finally starting to get a handle on the mechanical aspects but I have NO idea what to do on controller. Also, thanks for the info on those stubs (even though I now may actually end up going all the way to the hubs anyway - may have found a local good deal on that option). I suspected they might just pop out but didn't know.
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Old 05-11-2020, 10:07 AM   #7
Yellowbeard
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Quote:
Originally Posted by snow_bound26 View Post
Go to Rallispec and look up trans codes to find out what that pinion ratio is. Many of the rear diffs are actually a 3.54 with a 1.1:1 ration in the trans for a final drive of 3.90.


http://www.rallispec.com/downloads/T...art_Public.pdf

Match up you're trans code here and find the right diff.

Also, Insane Shafts builds CVs that will work with the R180 diff and the WRX hubs. Shoot them an email and they will set you up with the right part number. Their shafts are good for either 500hp or 1000hp depending on which you want.
Excellent. Thanks! I just do NOT want to build my own. It looks like someone local may have a solution that DOES, in fact, involve changing the hubs (which, I understand from him, can be done without changing all my suspension as long as I use 04 knuckles and hubs). However, if I end up going the "R180 to WRX hub route" then I will check this out. Thank you!
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Old 05-11-2020, 01:21 PM   #8
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Default ***update***

I'm now thinking about going with a USDM transmission (taller gears that matter, I have found out) - probably a 2007 with a 3.54 final drive out the rear.

This leads me to believe I can do the following.

Starting from the back of the engine:

1. STI pull style clutch mated to a 2007 USDM STI transmission, complete with shifter (probably updated in terms of bushings, kart boy, yadda yadda), shift linkage, etc.

I will likely put in a new clutch/flywheel. Any recommendations? I need to hold up to 425 HP (looks like I may switch over to E85 and add 80 ponies). I REALLY don't want my left leg getting significantly larger than my right, so something that will hold the power but not be exceptionally different in terms of operation than stock. Advice desired. I suspect I can get away with just a stock STI, here.

2. STI driveshaft mated to the required connector to go to an R160.

3. R160 in 3.54 - but where do I get this? Can I use any R160 that has this gear ratio?

...I think that's it? Seriously? That's actually super easy and CHEAPER than putting PPGs into my 5 (which is what I was considering).

I could put in a DCCD controller, but at this point I think I am just running the setup that a 2007 STI would have come with anyway.


I found a guy locally (also a guy on this forum) who can get me all the parts I need. He is convinced I should go all the way out to the hubs (and he's right, but I may end up doing this in stages for financial reasons).

So, that would be thing the first.

Then, depending on what I have to spend, I will eventually change the front axles to STI for beefierness, which will necessitate a hub change (to 04 5X100s so I can keep my current suspension and 5X100 Brembo's and BBS wheels).

I will also change the diff to an R180 3.54 which will then necessitate an axle change (again to beefierness) which will necessitate a hub change (again to 2004 5X100s so I don't have to change suspension).

But I think I will split these up for time and money reasons (well, depending) and I will try to remember to document what I do.

Thanks for the help. Opinions and advice welcome as always.
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Old 05-11-2020, 01:39 PM   #9
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I just pulled out my book of receipts and found the one for my 6-speed swap.

1) Whatever clutch kit you get, just make sure the throwout bearing is OEM. I am not sure if this is still the case, but the ACT clutch kit I installed had a TOB that wore out prematurely and started making sounds during cold start idles.

The flywheel apparently is different between 5 and 6-speed. a 6-speed flywheel was part of the install.

2) Why not just get the auto driveshaft for now so you have less to mess with?

3) If you are getting the 07 STi trans, then any 02-05 R160 would be good. That's what I recall from my research.

You will have to consider front control arms if you are going with STi axles. The track is wider than wagon. Personally, I switched to the GC aluminum arms since the GD wagon control arms has a recall. The only thing you would need to do if you get the GC arms is get the front-inner bushing pressed into the GC arm. I would just get a new one, or aftermarket like Whiteline which I have.
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Old 05-12-2020, 07:50 PM   #10
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I'm now thinking about going with a USDM transmission (taller gears that matter, I have found out) - probably a 2007 with a 3.54 final drive out the rear.

This leads me to believe I can do the following.

Starting from the back of the engine:

1. STI pull style clutch mated to a 2007 USDM STI transmission, complete with shifter (probably updated in terms of bushings, kart boy, yadda yadda), shift linkage, etc.

I will likely put in a new clutch/flywheel. Any recommendations? I need to hold up to 425 HP (looks like I may switch over to E85 and add 80 ponies). I REALLY don't want my left leg getting significantly larger than my right, so something that will hold the power but not be exceptionally different in terms of operation than stock. Advice desired. I suspect I can get away with just a stock STI, here.

Clutches are rated in torque capacity, so you need to buy one based on how much torque you are making at the crank. I strongly recommend looking at South Bend's offerings, their clutches have the best pedal feel/effort I've experienced.

2. STI driveshaft mated to the required connector to go to an R160.

If you're sticking with an R160, just find an 02-07 automatic Impreza driveshaft. No sense in swapping out the pinion flange on an R160 to run an STi driveshaft. Go R180 if you want an STi shaft.

3. R160 in 3.54 - but where do I get this? Can I use any R160 that has this gear ratio?

All 02-05 WRX w/ manual transmissions are 3.54 R160, so they are plentiful.

...I think that's it? Seriously? That's actually super easy and CHEAPER than putting PPGs into my 5 (which is what I was considering).

I could put in a DCCD controller, but at this point I think I am just running the setup that a 2007 STI would have come with anyway.

Wiring in the stock system is way too much work on a non-STi vehicle. Pick up either a DCCDPro or MapDCCD unit.


I found a guy locally (also a guy on this forum) who can get me all the parts I need. He is convinced I should go all the way out to the hubs (and he's right, but I may end up doing this in stages for financial reasons).

I'm a fan of doing it right the first time; I always recommend saving up enough money to buy the complete swap. The R180's LSD is much better than any R160.

So, that would be thing the first.

Then, depending on what I have to spend, I will eventually change the front axles to STI for beefierness, which will necessitate a hub change (to 04 5X100s so I can keep my current suspension and 5X100 Brembo's and BBS wheels).

I will also change the diff to an R180 3.54 which will then necessitate an axle change (again to beefierness) which will necessitate a hub change (again to 2004 5X100s so I don't have to change suspension).

But I think I will split these up for time and money reasons (well, depending) and I will try to remember to document what I do.

Thanks for the help. Opinions and advice welcome as always.
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Old 05-16-2020, 11:35 AM   #11
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Current state of the project:

It looks like I am now going with the following parts for phase 1 (possibly today):

(starting from the crank case)

1. ACT 6MT STI clutch (10k on it)

2. 2012 6MT out of an STI (100k on it - reportedly gently driven, though not by the proverbial little old lady).

3. STI Driveshaft (which, I am told, will bolt right to the R160 without a flange, which was a new lesson for me that I didn't know. Good info.)

4. R160 3.54


This leaves me with a speedo issue because the 2012 tranny doesn't have a speed sensor in the bell housing. So I will have to speed sense from the ABS sensor.

I will also have to get a DCCD controller, and I am now sorely tempted to get a combo which includes the ability to measure speed at all four wheels for greater traction control.

Anyone want to advise on this? Also, does anyone want to sell me a DCCD controller/Speed sensor combo they have lying around and realized they don't need?

Phase 2 will be R180, Axles, and 5X100 hubs to go with my already brembos and BBS 5X100s.

Phase 3 will be some combination of e85 and direct injection methanol capability. In this phase I will want to have an easy ability to switch tunes on the fly, so any advice welcome.

Phase 4 will be building an engine from scratch (or acquiring one).


Frankly, right now I am leaning toward the MAP advanced wheel sensor followed by (maybe later) the MAP G2 DCCD controller so they can work together.

All advice appreciated. PM me if you have speedo/dccd controller parts to sell.
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Old 05-17-2020, 10:22 AM   #12
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I'd double check the STI driveshaft bolting right up to a R160. Unless there's differences in the flanges of post-GD STI driveshafts that now allow them to bolt up to both same MY R180s and older R160s.

My personal swap had an auto driveshaft from 07 STI trans connecting to an 02-05 R160. I thought this was the only way but I could be wrong; it has been a long time since I've done this swap.
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Old 05-18-2020, 10:06 PM   #13
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Quote:
Originally Posted by kenliu84 View Post
I'd double check the STI driveshaft bolting right up to a R160. Unless there's differences in the flanges of post-GD STI driveshafts that now allow them to bolt up to both same MY R180s and older R160s.

My personal swap had an auto driveshaft from 07 STI trans connecting to an 02-05 R160. I thought this was the only way but I could be wrong; it has been a long time since I've done this swap.

I thought so too from reading lots of things, but this disagrees: https://www.dccdpro.com/technical-po...ns-swap-guide/

I guess I'm going to find out. At least an AT driveshaft is cheap if I need one. I'll need the STI for when I make the final swap to R180 anyway.

Thanks for the input!
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Old 05-19-2020, 08:41 PM   #14
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Quote:
Originally Posted by Yellowbeard View Post
I thought so too from reading lots of things, but this disagrees: https://www.dccdpro.com/technical-po...ns-swap-guide/



I guess I'm going to find out. At least an AT driveshaft is cheap if I need one. I'll need the STI for when I make the final swap to R180 anyway.



Thanks for the input!


Ok. This appears to be the answer.

At the 5:00 minute mark:
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Old 05-19-2020, 08:46 PM   #15
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so the answer is: no, the STI driveshaft will not bolt to the R160 directly. But apparently, you can swap out the "yoke"(?) on the R160 for the one from an R180? That seems to have been what I understood from that video. So this is another solution, alternative to using an auto driveshaft.
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Old 05-20-2020, 12:17 PM   #16
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Quote:
Originally Posted by kenliu84 View Post
so the answer is: no, the STI driveshaft will not bolt to the R160 directly. But apparently, you can swap out the "yoke"(?) on the R160 for the one from an R180? That seems to have been what I understood from that video. So this is another solution, alternative to using an auto driveshaft.
It's actually the flange that must be switched out, is my understanding. And that actually jives with what I had heard people say. Here's the part. https://www.flatironstuning.com/sti-...rential-flange
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Old 05-20-2020, 01:08 PM   #17
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Right, thats what I meant when I put that ? Next to yoke. Just wanted to be clear you're speaking of the flange on the R160 and not the flange of the driveshaft.
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Old 05-20-2020, 10:50 PM   #18
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Does the 2012 6MT you're getting have the speed sensor on the transmission? 93-07 Imprezas use a speed sensor on the transmission. I'm pretty sure 08+ they went to using the ABS system for speed sensing, so I'm doubting that 2012 6MT you have your eyes on has a speed sensor on it. If it doesn't, and you proceed with its purchase, you will need to buy MapDCCD's VSS kit that allows your computer to access speed sensor readings from your existing ABS system.

I would really try to find an 04-07 STi 6MT if possible for an easier swap as those years 100% have a speed sensor on the transmission for compatibility with your car.
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Old 05-21-2020, 06:25 PM   #19
Yellowbeard
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Originally Posted by kenliu84 View Post
Right, thats what I meant when I put that ? Next to yoke. Just wanted to be clear you're speaking of the flange on the R160 and not the flange of the driveshaft.


Ah. Sorry for the miscommunication. Yes. I should have noticed that terminology. Thanks.
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Old 05-21-2020, 06:28 PM   #20
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Originally Posted by 03SubyWRX View Post
Does the 2012 6MT you're getting have the speed sensor on the transmission? 93-07 Imprezas use a speed sensor on the transmission. I'm pretty sure 08+ they went to using the ABS system for speed sensing, so I'm doubting that 2012 6MT you have your eyes on has a speed sensor on it. If it doesn't, and you proceed with its purchase, you will need to buy MapDCCD's VSS kit that allows your computer to access speed sensor readings from your existing ABS system.

I would really try to find an 04-07 STi 6MT if possible for an easier swap as those years 100% have a speed sensor on the transmission for compatibility with your car.


Thank for letting me know! However, the end part of my post (and really the point of the post overall) is a question about whether people prefer MAP speed sensors to VSSPro speed sensors.

I’m leaning toward the map advanced because it measures speed at all four wheels and that data can be fed back to the DCCD controller which, I would think, lead to greater traction control.
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Old 05-21-2020, 09:45 PM   #21
03SubyWRX
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Originally Posted by Yellowbeard View Post
Thank for letting me know! However, the end part of my post (and really the point of the post overall) is a question about whether people prefer MAP speed sensors to VSSPro speed sensors.

I’m leaning toward the map advanced because it measures speed at all four wheels and that data can be fed back to the DCCD controller which, I would think, lead to greater traction control.
Just seeing that now, somehow I misread your post, my apologies! I think for the very reason you wrote about feedback to the DCCD controller I would lean towards MAP.
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Old 05-26-2020, 08:20 PM   #22
thejaredhuang
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I did a 6spd in my 06 Wagon, here are my thoughts:

Ideally you want a 06 or 07 transmission for 3 reasons. #1 they still have a fluid pump which helps with reliability, #2 they work with the GD with no modifications, #3 3.54 rear diff ratio which means you can use any 02-05 R160 or any 06+ R180.

The next preferred is a 08+ transmission for these reasons. #1 newer/less mileage, #2. 3.54 so same as #2 above, #3 cost less than GD transmissions, #4 supposedly they have stronger carbon synchros
The only downside is the speed sensor but that has been addressed sufficiently.

I would avoid 04-05 transmissions for the following: #1 oldest, #2 limited 3.90 ratio.

If you do get an 06+ transmission and decide to go R180 don't bother with 06-07 IMO, both use a clutch type LSD that requires $20/L oil and offers no tangible benefits for 99% of drivers. The 08+ R180 is torsen (gear) based and shouldn't wear out over the lifetime of the car. Also 08+ R180s are much cheaper and more plentiful than 06-07.

I'm not 100% sure but if you want to use the R180 and keep the 5x100 I think you still need to get 04 STI rear hubs or maybe use axles from a Legacy GT spec B.

You can use any slave cylinder from the 02-05 WRX or any STI, it should all bolt up. Get the stainless steel line while you're there.
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Old 06-05-2020, 10:40 PM   #23
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Quote:
Originally Posted by thejaredhuang View Post
I did a 6spd in my 06 Wagon, here are my thoughts:

Ideally you want a 06 or 07 transmission for 3 reasons. #1 they still have a fluid pump which helps with reliability, #2 they work with the GD with no modifications, #3 3.54 rear diff ratio which means you can use any 02-05 R160 or any 06+ R180.

The next preferred is a 08+ transmission for these reasons. #1 newer/less mileage, #2. 3.54 so same as #2 above, #3 cost less than GD transmissions, #4 supposedly they have stronger carbon synchros
The only downside is the speed sensor but that has been addressed sufficiently.

I would avoid 04-05 transmissions for the following: #1 oldest, #2 limited 3.90 ratio.

If you do get an 06+ transmission and decide to go R180 don't bother with 06-07 IMO, both use a clutch type LSD that requires $20/L oil and offers no tangible benefits for 99% of drivers. The 08+ R180 is torsen (gear) based and shouldn't wear out over the lifetime of the car. Also 08+ R180s are much cheaper and more plentiful than 06-07.

I'm not 100% sure but if you want to use the R180 and keep the 5x100 I think you still need to get 04 STI rear hubs or maybe use axles from a Legacy GT spec B.

You can use any slave cylinder from the 02-05 WRX or any STI, it should all bolt up. Get the stainless steel line while you're there.


Wow! That was super useful.

I ended up with a 2012 with 100k purportedly on it (from a source I have confidence in).

In point of fact, I HAVE 04 5x100s which were put on the car by the previous owner when he installed brembos, along with BBSs. So that part is solved.

I’m doing what I call a “phase 1 swap” right now meaning I’m just using an R160 and my existing hubs and axles. This is partly for cost reasons and partly labor (though I am having a BEAR of a time getting the transmission out and think I will have no choice but to remove the wheels and uncouple the hubs up front, though I did figure out what I think may be a new method for getting the rear diff in and out w/o removing the rear wheels which I will post as a follow up).

I’m currently thinking about getting the advanced 4 wheel map dccd speed sensor and a used 2008-2012 dccd controller out of a used Subaru. Reason being cost. What I WANT is the map dccd g2 controller to interact with that four wheel speed sensor for advanced traction control. But I figure I can put the four wheel sensor on now, spend 75 bucks on eBay for a used original dccd controller and knob and replace it with a mapdccd g2 at my leisure.

Later I will upgrade the hubs and axles and rear diff as well.

Any advice always appreciated.
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Old 06-05-2020, 10:41 PM   #24
Yellowbeard
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Quote:
Originally Posted by 03SubyWRX View Post
Just seeing that now, somehow I misread your post, my apologies! I think for the very reason you wrote about feedback to the DCCD controller I would lean towards MAP.


No worries! Thanks just for responding and for the subsequent advice!
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Old 06-05-2020, 11:26 PM   #25
Yellowbeard
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Here are the videos I was talking about upthread. I also posted it as it's own topic.

https://www.youtube.com/playlist?lis...SJbmeU2T6EDCp3
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