Welcome to the North American Subaru Impreza Owners Club Wednesday September 2, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Transmission (AT/MT) & Driveline

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-30-2012, 08:53 PM   #1
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Question Time for a one piece drive shaft? '12 WRX - All bushings and mounts, still sloppy.

So, in an endless quest for perfection, I've installed literally every single drivetrain bushing and mount available for my 2012 WRX; engine mounts, pitch stop, gearbox bushings, trans mount, STS kit & bushings, rear diff inserts and subframe inserts.

When I let off the throttle, make an imperfect shift, etc though, I STILL get that awd 'bounce', slack, clunking, etc, (different from true internal gear slack, which I feel when rolling in 2nd, for instance).

Will a one piece drive shaft fix this? Or should I buy the $35 drive shaft bushings? (I hear they don't do anything because of the giant 'donut' gasket.)

I love my modded WRX, and much more than when it was stock; it's taut, it's responsive, it's crisp, etc but really only when you get it perfect, otherwise the car bucks and bounces and will even do so when you just let off the gas
* Registered users of the site do not see these ads.

Last edited by blehhh; 10-30-2012 at 09:10 PM.
blehhh is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-30-2012, 09:52 PM   #2
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally Posted by blehhh View Post
So, in an endless quest for perfection, I've installed literally every single drivetrain bushing and mount available for my 2012 WRX; engine mounts, pitch stop, gearbox bushings, trans mount, STS kit & bushings, rear diff inserts and subframe inserts.

When I let off the throttle, make an imperfect shift, etc though, I STILL get that awd 'bounce', slack, clunking, etc, (different from true internal gear slack, which I feel when rolling in 2nd, for instance).

Will a one piece drive shaft fix this? Or should I buy the $35 drive shaft bushings? (I hear they don't do anything because of the giant 'donut' gasket.)

I love my modded WRX, and much more than when it was stock; it's taut, it's responsive, it's crisp, etc but really only when you get it perfect, otherwise the car bucks and bounces and will even do so when you just let off the gas
some of that is yer t00n....but some is also that crappy ds....get a cf one
Uncle Scotty is offline   Reply With Quote
Old 10-31-2012, 11:36 AM   #3
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

While a CF DS would be quite prime, I don't know how I feel about shelling out $1500 for a DS. Anyone have an aluminum one? Do they get rid of that bounce?
blehhh is offline   Reply With Quote
Old 10-31-2012, 11:51 AM   #4
Geeoff
Scooby Specialist
 
Member#: 106439
Join Date: Jan 2006
Chapter/Region: NESIC
Location: Manchester, NH
Vehicle:
06 WRX TR
'05 Matrix XRS

Default

The DSS CF shaft is only $1000. One of my favorite mods for sure.
Geeoff is offline   Reply With Quote
Old 10-31-2012, 12:23 PM   #5
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by Geeoff View Post
The DSS CF shaft is only $1000. One of my favorite mods for sure.
Looking around online, you're definitely right. It is more like $1000. *sigh* Next spring... next spring.
blehhh is offline   Reply With Quote
Old 10-31-2012, 12:30 PM   #6
connorlug
Scooby Newbie
 
Member#: 275276
Join Date: Feb 2011
Chapter/Region: Tri-State
Location: Long Island, New York
Vehicle:
2007 FXT
CGM

Default

Damn dude you must hate stock cars the things brand new! lol
connorlug is offline   Reply With Quote
Old 10-31-2012, 12:37 PM   #7
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by connorlug View Post
Damn dude you must hate stock cars the things brand new! lol
I've been playing video games for too long, I think. I'm used to immediate throttle response, cars that feel like a solid chunk of engine, and no perceived drivetrain slack or body roll or anything. Just acceleration, deceleration and turning lol.

My mods have all added up to a serious improvement over stock though. I used to cringe at the thought of driving my WRX in the morning because of how much play there was in... every single thing about it. It felt like the whole car was held together with a series of ham sandwhiches.

Now it's taut, responsive, solid, smooth, etc except for when you get it wrong or let off the throttle.
blehhh is offline   Reply With Quote
Old 10-31-2012, 03:39 PM   #8
skets
Scooby Newbie
 
Member#: 170698
Join Date: Feb 2008
Location: Kingston, Jamaica
Vehicle:
2003 WRX V-Limited
Blue

Default

I'm looking forward to hearing the answer to this because I am in exactly the same situation and like you I think the $400 aluminum driveshaft will be more than enough (dont see the need to drop a grand on the CF one).
skets is offline   Reply With Quote
Old 10-31-2012, 03:58 PM   #9
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by skets View Post
I'm looking forward to hearing the answer to this because I am in exactly the same situation and like you I think the $400 aluminum driveshaft will be more than enough (dont see the need to drop a grand on the CF one).
Glad to hear that I am not the only one experiencing this and willing to pay to have it eliminated. I was really hoping the Group N engine mounts were the last lose end, but I guess not. Even after the drive shaft, I suppose there will always be the true internal mechanical slop, as well as the sprung clutch. I hope I can live with those!

Kind of relieved to know that there is yet another step to be taken to further improve driveability.
blehhh is offline   Reply With Quote
Old 10-31-2012, 06:41 PM   #10
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

d00000ds....im thinking that this whole 'rubber banding' thing is in the tune....the throttle needs to be retuned so it wont do this most likely

it is IMPOSSIBLE to take ALL the slop outta this driveline as the whole awd thing means LOTS of parts that gotta work together and that involves some inevitable slop in the system

i think that if it isnt a tuning issue, ya need a differnt car....or learn how to drive it so it wont DO that
Uncle Scotty is offline   Reply With Quote
Old 10-31-2012, 07:03 PM   #11
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

I can drive it so that it won't, it just takes a lot of precision for a DD, which gets most of its mileage while you're half awake, or coming off a long day at the office. I still rip on it, and I'm up for that when the road beckons, but my mad driving skillz are in tatters during a commute.

To be honest though, driving home today was fine and I do feel the difference that the engine mounts have made. The bouncing, rubber banding issue, (at this stage in the game) is something that I'm blowing way out of proportion in my mind.

Last edited by blehhh; 10-31-2012 at 09:51 PM.
blehhh is offline   Reply With Quote
Old 11-01-2012, 11:53 AM   #12
aboothman
Scooby Specialist
 
Member#: 127745
Join Date: Oct 2006
Chapter/Region: NWIC
Location: CA
Vehicle:
06 WRX 30r 6 speed
99L EJ255 6 Speed

Default

It is not the "tOOn"...once you let off the throttle the injectors shut, and as soon as whatever air is passing through the intake has been used the engine is out of the equation. A front mount makes the issue more pronounced, especially when you stab the throttle, but most of what is experienced is exaggerated by the drivetrain.

The car bounces for the exact reason you think it does, drivetrain slop. Especially in the carrier bearing.

I used to experience it, and then I installed a 1 piece. Then I switched back to the OEM, and later back to the 1 piece again. I also have every bushing available as I too hate drivetrain slop ad wanted a firm responsive car.

There are pros and cons to a 1 piece...especially if you pick up an aluminum piece. They are expensive as well. I would recommend looking into a steel 1 piece with good quality yokes and replaceable ujoints.

Before anything, however, see if you can find a car that has one to drive and see if it has the same behavior. In my opinion, and experience, it is the cause of your issue, but it is a different car...
aboothman is offline   Reply With Quote
Old 11-01-2012, 12:28 PM   #13
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

I just wish there were a way to lock the carrier bearing in place. That outrigger and the rubber connecting to the carrier bearing allow such a huge amount of transverse play in the drive shaft.
blehhh is offline   Reply With Quote
Old 04-24-2013, 11:34 AM   #14
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Welp, finally pulled the trigger on a PST Carbon Fiber Driveshaft a few minutes ago. I'll let you guys know how it turns out... Car is fully tuned on Stage III now, and the two-piece driveshaft is really spoiling the fun.
blehhh is offline   Reply With Quote
Old 04-24-2013, 02:49 PM   #15
Rally2
Scooby Newbie
 
Member#: 132023
Join Date: Nov 2006
Chapter/Region: W. Canada
Location: Alberta Canada
Vehicle:
2005 STI
blue

Default

Interesting thread, definitely let us know what the 1 piece c/f shaft does for drivetrain slop and throttle response
Rally2 is offline   Reply With Quote
Old 04-24-2013, 04:30 PM   #16
BigAir
Scooby Newbie
 
Member#: 200496
Join Date: Jan 2009
Chapter/Region: MWSOC
Location: Michigan
Vehicle:
2008 WRX
Obsidian Black

Default

Yes, I'm interested as well. 08 wrx. I'm near my "point of no return" for modding vs putting back to stock and getting an sti (for the 6sp and differential). Some of those bushings were a pain in the #ss to install. As I slowly move this car more toward track duty with bushing and suspension improvements, I would like to see about increased "driveability" and responsives with a CF one piece drive shaft. First event is this weekend
The Kartboy pitch stop I just installed made a difference in how my car starts out from a stop and responds to throttle. I've been dreading tackling the engine mounts, but will get to it.
BigAir is offline   Reply With Quote
Old 05-01-2013, 12:52 PM   #17
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Well it's here, and it looks pretty good, and yes, it's quite light. The paint is sanded off the u-joints here and there, but the CF looks perfect. Hopefully get it installed this weekend.

Last edited by blehhh; 05-01-2013 at 01:08 PM.
blehhh is offline   Reply With Quote
Old 05-01-2013, 06:19 PM   #18
Blktrax
Scooby Newbie
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default

Are you going to ....


http://www.advancedclutch.com/6240018


No doubt losing the carrier bearing is going to help, but an un-sprung clutch disc is going to affect on/off throttle transition more severely.
Blktrax is offline   Reply With Quote
Old 05-01-2013, 08:43 PM   #19
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by Blktrax View Post
Are you going to ....


http://www.advancedclutch.com/6240018


No doubt losing the carrier bearing is going to help, but an un-sprung clutch disc is going to affect on/off throttle transition more severely.
That's what I'm afraid of... I'm really hoping what I feel isn't the clutch, and that the DS fixes it.
blehhh is offline   Reply With Quote
Old 05-01-2013, 10:18 PM   #20
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Sooo, I'm pretty sure this is wrong, right?

blehhh is offline   Reply With Quote
Old 05-01-2013, 10:51 PM   #21
Blktrax
Scooby Newbie
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default

Yea, that's not going to work on a Subaru rear diff, they're all 4 bolts unless modified.


http://www.driveshaftshop.com/import...ber-driveshaft

Blktrax is offline   Reply With Quote
Old 05-01-2013, 11:00 PM   #22
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by Blktrax View Post
Yea, that's not going to work on a Subaru rear diff
PST packaged it wrong then...

blehhh is offline   Reply With Quote
Old 05-01-2013, 11:07 PM   #23
Blktrax
Scooby Newbie
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default

*edit* likely mis-packaged, see pics below.

I see the pic there... I wonder if its a discontinued product...

http://www.pstds.com/carbonfiber.htm

Other than whats on the link above, it says call to order a custom drive-shaft, and that part/application isn't listed.


I Digress rallysport direct has that part number listed for the WRX and the picture appears to be correct.
http://www.rallysportdirect.com/PST-...ber-Driveshaft


Last edited by Blktrax; 05-01-2013 at 11:21 PM.
Blktrax is offline   Reply With Quote
Old 05-01-2013, 11:53 PM   #24
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

e-mailed the retailer. Hopefully they can take it up with PST. I'm curious what car this is for...
blehhh is offline   Reply With Quote
Old 05-01-2013, 11:58 PM   #25
Rodwrx23
Scooby Specialist
 
Member#: 170948
Join Date: Feb 2008
Chapter/Region: South East
Location: Pembroke Pines, FL
Default

I absolutely love my DSS cf shaft. I got tired of staring at it online and saying "next year" for several years in a row. I got a sweet deal on it too from IIR
Rodwrx23 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 01:25 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.