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Old 04-04-2013, 05:34 PM   #1
RIBahler
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Join Date: Jul 2012
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Location: Oregon
Vehicle:
2005 WRX STi Wagon
Crystal Grey Metallic

Default WRX Tranny Go BOOM!...05' STI Wagon Commense!

The story of stories...My 2005 WRX Wagon transmission first gear said good buy to me on April Fools Day, and I said "ARE YOU KIDDING ME"!?! There was no response not even a chuckle, so I knew it wasn't a joke. I then proceeded to pull over and tried to put it in first gear...Nope 'Not today Jr, not ever agian', so I tried second gear and lucky enough it went in. Then I saddly slipped the clutch to get going and this little piggy limped all the way home.

Well yes it was a bad April Fools Day and yes I was the fool this time, but thats okay because now I have a good excuse to start my STI conversion on monday.

Parts just ordered and being installed by FTW Tuning:
-2004 STI Transmission
-R180 Rear Diff
-Rear Axles
-Driveline
-Linkage
-Front/Rear Brembos
-Rear Hubs
-Exedy OEM Replacement Clutch
-Used Resurface STI Flywheel
-Redline Transmission and Diff Fluid
-Used STI Cluster
-DCCDPro Center Diff Controller w/ STI Cluster Harness
-Power Slot Slotted Brake Rotors
-Stoptech Street Performance Brake Pads
-Perrin Subframe Diff Lockdown Kit
-Perrin Shifter Bushings
-Perrin Shifter Bushings Rear
-Group N Transmission Mount
-Grimmspeed AOS

Car currently has:

Engine
-Stock EJ205
- 19 lbs of Boost
- 320 AWHP
- 299 AWTQ
-SPT Intake & Heatshield
-2010 STI TMIC
-IHI VF43 Turbo
-Perrin Turbo Heat Blanket
-Perrin Inlet Hose
-FIC 775CC Injectors
-Walbro 255lph Fuel Pump
-Grimmspeed Electronic Boost Controller
-Grimmspeed Cross Pipe
-Perrin Up Pipe
-Perrin Down Pipe
-Modified SPT Mid Pipe
-SPT Axle Back Exhaust

Suspension:
-Swift Springs
-Perrin Rear Sway Bar
-Perrin Rear End Links

Wheels:
-2004 STI BBS Wheels

Tires:
Bridgestone Potenza RE970AS Pole Position Ultra High Performance All-Season

I know I have a ways to go until I have a complete 05' STI Wagon, but this just gets me that much closer. I hope to be complete with the swap on next friday, so I can prepair for Autocross on April 20th.

*If you have any suggestions, than please let me know and i would be glad to entertain them*



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Last edited by RIBahler; 04-16-2013 at 07:07 PM. Reason: Giving props to FTW Tuning for their work
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Old 04-04-2013, 05:51 PM   #2
RIBahler
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Crystal Grey Metallic

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If anyone is curious what else is done then here you go:

Dyno Tune: 2005 WRX WOW!
http://forums.nasioc.com/forums/show...hlight=wrx+wow

Modified Splitter for 05' WRX w/ 10' STI Intercooler
http://forums.nasioc.com/forums/show....php?t=2458117
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Old 04-04-2013, 07:32 PM   #3
RIBahler
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Crystal Grey Metallic

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Looks like its going to be a couple more weeks until my DCCDPro will show up, but I am still doing the swap without it for now. I was curious if anyone has driven their STI Drivetrain swap without the DCCD hooked up and is it ok to do so until I recieve and install the DCCDPro?
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Old 04-04-2013, 07:33 PM   #4
codesoccer
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Quote:
Originally Posted by RIBahler View Post
Looks like its going to be a couple more weeks until my DCCDPro will show up, but I am still doing the swap without it for now. I was curious if anyone has driven their STI Drivetrain swap without the DCCD hooked up and is it ok to do so until I recieve and install the DCCDPro?
Not gonna hurt anything.
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Old 04-04-2013, 10:16 PM   #5
RIBahler
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Quote:
Originally Posted by codesoccer View Post
Not gonna hurt anything.
I heard that it will be more like rear wheel drive and that I should be careful while taking corners because I can easily get turned around, so I guess i'll be taking it easy until I get the DCCDPro hooked up.
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Old 04-05-2013, 01:02 AM   #6
RIBahler
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The next autox will be april 20 and the 21 at Goshen Forest Products (the Old Mill) 33908 Hampton Rd, Eugene, OR. Come on out if you want to ride along!
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Old 04-05-2013, 03:52 PM   #7
mhoerath
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Quote:
Originally Posted by RIBahler View Post
I heard that it will be more like rear wheel drive and that I should be careful while taking corners because I can easily get turned around, so I guess i'll be taking it easy until I get the DCCDPro hooked up.
the dccd is open unless a controller tells it to close. Open means your power split is more to the rear wheels, less to the front. At 100% lock you'll have a 50-50 power split. Different year groups have different "open" power splits. my jdm v7 my 05 has a 35/65 split.

I only engage my dccd racing on dirt or driving in snow, and have it programmed to open progressively as ground speed increases.
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Old 04-06-2013, 12:34 AM   #8
atomicfire
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04-06 STi transmission is 35F/65R with "open" type center differential. It's possible (but highly not recommended) to do a rwd burnout with these transmissions.

07+ is 41F/59R torque split, with I believe a helical center LSD. No more RWD burnouts - the center differential will sense slip and lock up slightly (mechanical LSD)

In all year STis from 04+, you can manually control the DCCD to lock up the center diff UP TO 50/50.

Stock DCCD programming is to be "OPEN" during straight driving, then progressively start locking once the yaw sensor sees peak Gs with throttle input. Basically, in "simple speak", the computer will look for your apex in a turn, and at apex the diff is "open" but as you lay on the gas and throttle out of the apex, the computer will progressively start locking the diff to 50/50.

hope this helps
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Old 04-06-2013, 04:32 PM   #9
RIBahler
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2005 WRX STi Wagon
Crystal Grey Metallic

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Quote:
Originally Posted by atomicfire View Post
04-06 STi transmission is 35F/65R with "open" type center differential. It's possible (but highly not recommended) to do a rwd burnout with these transmissions.

07+ is 41F/59R torque split, with I believe a helical center LSD. No more RWD burnouts - the center differential will sense slip and lock up slightly (mechanical LSD)

In all year STis from 04+, you can manually control the DCCD to lock up the center diff UP TO 50/50.

Stock DCCD programming is to be "OPEN" during straight driving, then progressively start locking once the yaw sensor sees peak Gs with throttle input. Basically, in "simple speak", the computer will look for your apex in a turn, and at apex the diff is "open" but as you lay on the gas and throttle out of the apex, the computer will progressively start locking the diff to 50/50.

hope this helps
Thank you for the information! I think the only other difference is the 04' has a suretrac lsd and 05' and on have the helical lsd.
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Old 04-07-2013, 08:05 AM   #10
mhoerath
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other differences depending on when in 04. rallispec transmission chart in post 1

http://forums.nasioc.com/forums/show...smission+chart
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Old 04-07-2013, 05:40 PM   #11
RIBahler
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Quote:
Originally Posted by mhoerath View Post
other differences depending on when in 04. rallispec transmission chart in post 1

http://forums.nasioc.com/forums/show...smission+chart
Good information...thanks!
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Old 04-09-2013, 06:44 PM   #12
RIBahler
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Crystal Grey Metallic

Default

Parts are in the shop and after inspection I decided to add a couple extras:
-Power Slot Slotted Brake Rotors
-Stoptech Street Performance Brake Pads
-Perrin Subframe Diff Lockdown Kit
-Perrin Shifter Bushings
-Perrin Shifter Bushings Rear
-Grimmspeed AOS (because I got it for $100)

Last edited by RIBahler; 04-09-2013 at 06:58 PM. Reason: Missed a word
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Old 04-10-2013, 11:47 AM   #13
RIBahler
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Crystal Grey Metallic

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Just added a Group N Transmission Mount. Oh man...I need to stop adding parts and get this swap done.
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Old 04-10-2013, 12:15 PM   #14
RIBahler
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Need Help!...Come to find out that the breather nozzle on the top front of the transmission case is missing. The hose is there, but the breather nozzle is missing.

I have looked as far as I could all over the internet and I got nothing. Does anyone know where I can find a breather nozzle?
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Old 04-12-2013, 01:28 PM   #15
RIBahler
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No help...no worries! I will just make a custom set up.
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Old 04-15-2013, 09:14 PM   #16
RIBahler
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Brakes are going High Temp Black with the white Brembo logo.



Last edited by RIBahler; 04-16-2013 at 01:48 PM. Reason: spelling error
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Old 04-16-2013, 07:04 PM   #17
RIBahler
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In the process of removing everything and preparing to put in the STI Trans and Brakes.






Last edited by RIBahler; 04-16-2013 at 07:11 PM.
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Old 04-18-2013, 11:35 AM   #18
RIBahler
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Progress...Transmission, Driveshaft, Rear Diff, Axles, and Hubs are all in. Im hoping this friday it will be all complete, because I am ready to drive!


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Old 04-18-2013, 01:21 PM   #19
RexFTW
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Quote:
Originally Posted by mhoerath View Post
the dccd is open unless a controller tells it to close. Open means your power split is more to the rear wheels, less to the front. At 100% lock you'll have a 50-50 power split. Different year groups have different "open" power splits. my jdm v7 my 05 has a 35/65 split.

I only engage my dccd racing on dirt or driving in snow, and have it programmed to open progressively as ground speed increases.
This is a bit misleading.

Your natural torque splits is 65/35 and nothing will change that. Torque will naturally take the path of least resistance and limited slip differentials are to fight that. So, in lockup, if you light up the rear tires and the fronts grip your _effective_ torque distribution after the differential shifts torque will be near 0% rear/near 100% front (like for example if your rears are on ice and your fronts are on pavement with full lock and you launch it). Vice versa is also true.

Dccd does not directly impact this native torque split, only shift torque under slip conditions. It will almost never be a true 50/50 split.

In full lock your rear tires are still receiving more torque than the front until something slips and there is torque to shift.

You can take this to the extremes and engineer scenarios where you can get 100/0 torque split or 0/100 torque split.

A true dynamic torque split like what you are referring to is a very different thing. All we have is a limited slip differential with variable lockup. Not much different than a limited slip differential in a front or rear while drive car. It doesn't change the natural torque split from tire to tire, just shifts torque when rotation speeds from one side to the other change.

Last edited by RexFTW; 04-18-2013 at 01:30 PM.
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Old 04-18-2013, 02:22 PM   #20
RIBahler
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Quote:
Originally Posted by RexFTW View Post
This is a bit misleading.

Your natural torque splits is 65/35 and nothing will change that. Torque will naturally take the path of least resistance and limited slip differentials are to fight that. So, in lockup, if you light up the rear tires and the fronts grip your _effective_ torque distribution after the differential shifts torque will be near 0% rear/near 100% front (like for example if your rears are on ice and your fronts are on pavement with full lock and you launch it). Vice versa is also true.

Dccd does not directly impact this native torque split, only shift torque under slip conditions. It will almost never be a true 50/50 split.

In full lock your rear tires are still receiving more torque than the front until something slips and there is torque to shift.

You can take this to the extremes and engineer scenarios where you can get 100/0 torque split or 0/100 torque split.

A true dynamic torque split like what you are referring to is a very different thing. All we have is a limited slip differential with variable lockup. Not much different than a limited slip differential in a front or rear while drive car. It doesn't change the natural torque split from tire to tire, just shifts torque when rotation speeds from one side to the other change.
Thank you for the clarification!
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Old 04-18-2013, 04:51 PM   #21
kantthinkofasn77
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When is this engine going in??!! Lol i have the same wagon but only have dreams of an sti swap
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Old 04-18-2013, 06:29 PM   #22
gsla72
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Quick question, did your wrx transmission crossmember work with the sti transmission?
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Old 04-22-2013, 09:59 PM   #23
RIBahler
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Quote:
Originally Posted by kantthinkofasn77 View Post
When is this engine going in??!! Lol i have the same wagon but only have dreams of an sti swap
I will be building and swapping a 2.5 STi motor in about a year or two. I need to save the money up again and I want to make sure it's done right, so I will take my time.
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Old 04-22-2013, 10:00 PM   #24
RIBahler
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Quote:
Originally Posted by gsla72 View Post
Quick question, did your wrx transmission crossmember work with the sti transmission?
Sure did!
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Old 04-22-2013, 10:11 PM   #25
RIBahler
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STi rears done.

STi fronts done.

Perrin Subframe Diff Lockdown Kit done.

Perrin Shifter Bushings, Perrin Rear Shifter Bushings, Group N Transmission Mount done.


The last this is wiring up the DCCDpro and STi Cluster!!! =)
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