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Old 11-25-2014, 09:05 PM   #1
armharm
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Default 2015 WRX lsd?

I was wondering if you guys can shed some light on this. Does the 2015 non sti have a limited slip differential or something like it? Does more power go to the outer wheels on turns? If not then what is the point of the display in the center showing how much power is going to each wheel?

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Old 11-25-2014, 09:11 PM   #2
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no it has an open differential. The display is for brake vectoring
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Old 11-25-2014, 09:13 PM   #3
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Open differentials. And the last time I drove on LSD was in 1991 in a Saab 900 turbo. It was trippy, particularly when it started to rain and I had to turn on the wipers. I recommend against it.
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Old 11-25-2014, 09:17 PM   #4
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Are you sure the display shows when the car is using torque vectoring?

Maybe, I think it is mainly for low traction situations to see what each wheel is doing -- I hope to encounter one such situation tomorrow, during the expected snow storm...

In everyday driving that display is pretty damn boring.

I just drove thru snowmaggedon and the display is still pretty damn boring. What you get is usually temporary flashing lights on all 4 wheels simultaneously while the traction control light flashes. For very brief moments it sometimes shows only one or two wheels when the traction light comes on, but mostly, lots of temporary flashes that amuse but don't inform.

Probably only useful when stuck in the snow, as the other person suggested, so you can restore traction to the slipping wheels, but how often is that gonna happen, when the other wheels usually get traction...

Last edited by Zeeper; 11-26-2014 at 04:59 PM. Reason: just tested the lights, woot!
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Old 11-25-2014, 09:23 PM   #5
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Quote:
Originally Posted by Zeeper View Post
Are you sure the display shows when the car is using torque vectoring?

Maybe, I think it is mainly for low traction situations to see what each wheel is doing -- I hope to encounter one such situation tomorrow, during the expected snow storm...

In everyday driving that display is pretty damn boring
This.

It shows if you've slipped in the last 30 seconds or what wheel is slipping. The only time I think this would be helpful is if you are stuck in snow you'll know what wheel to focus your digging or providing traction efforts.
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Old 11-25-2014, 09:28 PM   #6
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They stopped using LSD in 2008. IMO an LSD required for any performance car, its a must have. Thats why the STI's get them. Very disappointing to hear they don't have them. At least i have one in my old 2002 WRX.
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Old 11-25-2014, 09:49 PM   #7
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Open diffs. No ability to generate anything but 50/50 side to side. Despite what the marketing department would lead you to believe.
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Old 11-25-2014, 10:16 PM   #8
Scoobman20
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Default 2015 WRX lsd?

Viscous center diff and open front and rear diffs with brake assisted torque vectoring if you are in normal or trac mode.

Viscous diff helps send power to the front or back, whichever isn't slipping. Defaults at 50/50 torq distribution.

I'd like to know if anyone has information about replacing the center diff. Are there any "bolt on" options or custom options? STI swap maybe?

BTW, Cusco offers a 183 L15 rear lsd that works.

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Old 11-26-2014, 02:51 PM   #9
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And when searching for intense technical knowledge on a vehicle you intend to spend thousands on, the LAST thing you want to do is perform said critical research on a god damn phone! Go to subaru.com and read, then go to the transmission forum AKA the right forum and read, then ask specific pointed questions after taking the right steps in the process.
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Old 11-26-2014, 03:05 PM   #10
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Quote:
Originally Posted by Unabomber View Post
And when searching for intense technical knowledge on a vehicle you intend to spend thousands on, the LAST thing you want to do is perform said critical research on a god damn phone! Go to subaru.com and read, then go to the transmission forum AKA the right forum and read, then ask specific pointed questions after taking the right steps in the process.
Well the car is already purchased and I did try doing some searches (from a computer) and consult the manual. I'm not very technical when it comes to cars so I wouldn't know that LSD is related to transmissions and the manual isn't specific as to what the display does, hence the thread in general.

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Old 11-26-2014, 03:07 PM   #11
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Note: the CVT WRX does not have a viscous coupler, uses an electronically controlled clutch system, similar to other Subaru automatics.

While there is no LSD, the current generations of Subaru use integrated Vehicle Dynamics Control (ABS, Traction Control) and the WRX has torque vectoring.

In normal, on road driving, I doubt you will have issues with loss of traction due to the open differentials, but if that is your concern, sell it and buy an STI.
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Old 11-26-2014, 10:33 PM   #12
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I thought the Australian 2015 WRX still had rear LSD but open front diff.
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Old 11-27-2014, 12:00 AM   #13
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I thought the Australian 2015 WRX still had rear LSD but open front diff.
Yes, only for MT though. So, there is another reason to get MT over CVT in Australia
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Old 11-27-2014, 01:18 AM   #14
armharm
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Yes, only for MT though. So, there is another reason to get MT over CVT in Australia
Any way to get the Australian lsd part and put it on and american WRX?

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Old 11-27-2014, 02:31 AM   #15
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Yes, only for MT though. So, there is another reason to get MT over CVT in Australia

Where did you find that info and what's the part number??


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Old 11-27-2014, 03:42 AM   #16
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I thought the Australian 2015 WRX still had rear LSD but open front diff.
Where did you hear that ? I've seen it mentioned a few times but can't find any information on it.
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Old 11-27-2014, 05:35 AM   #17
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Quote:
Originally Posted by Zeeper View Post
Note: the CVT WRX does not have a viscous coupler, uses an electronically controlled clutch system, similar to other Subaru automatics.

While there is no LSD, the current generations of Subaru use integrated Vehicle Dynamics Control (ABS, Traction Control) and the WRX has torque vectoring.

In normal, on road driving, I doubt you will have issues with loss of traction due to the open differentials, but if that is your concern, sell it and buy an STI.
I vote we stop using the term "torque vectoring". It's a mischaracterization. That term has a well-understood meaning in the automotive world, and it's not what is in a WRX. The WRX has no ability to transfer or otherwise apply more torque to one wheel independent of another of a given axle. It has open diffs, which means a 50/50 lateral split 100% of the time.
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Old 11-27-2014, 05:48 AM   #18
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It is just in the spec sheet, and there are many Australian reviews highlighting Viscous LSD.

http://www.subaru.com.au/wrx-and-wrx-sti/specs

I have been looking for the part number, but having no luck yet, might have to ask subaru genuine parts dealers.
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Old 11-27-2014, 06:09 AM   #19
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Quote:
Originally Posted by es2464 View Post
It is just in the spec sheet, and there are many Australian reviews highlighting Viscous LSD.

http://www.subaru.com.au/wrx-and-wrx-sti/specs

I have been looking for the part number, but having no luck yet, might have to ask subaru genuine parts dealers.
? That clearly says center diff. We know it has a VC center diff. We're talking about the rear.
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Old 11-27-2014, 07:21 AM   #20
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? That clearly says center diff. We know it has a VC center diff. We're talking about the rear.
Oops, sorry, I thought it was there, try this one

http://subaru-com-au-2.s3.amazonaws....8__for_web.pdf
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Old 11-27-2014, 11:07 AM   #21
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Originally Posted by es2464 View Post
Oops, sorry, I thought it was there, try this one

http://subaru-com-au-2.s3.amazonaws....8__for_web.pdf
That's a 28 page document. Can you be a little more specific?

The Spec-sheet again only mentions the VC center diff...nothing about the front or rear diffs.
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Old 11-27-2014, 11:59 AM   #22
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It says "traction control Limited Slip Device (LSD)". I still think they are talking about the center diff.


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Old 11-27-2014, 05:27 PM   #23
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lol.. could have done a search..
ok, go to page 24, in 'MODEL FEATURE SPECIFICATIONS' page,
look for 'Rear Limited Slip Differential (LSD) (manual)' and/or Torsen in the left hand side column, under 'CHASSIS AND MECHANISM'.
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Old 11-27-2014, 08:21 PM   #24
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Quote:
Originally Posted by SoapBox View Post
I vote we stop using the term "torque vectoring". It's a mischaracterization. That term has a well-understood meaning in the automotive world, and it's not what is in a WRX. The WRX has no ability to transfer or otherwise apply more torque to one wheel independent of another of a given axle. It has open diffs, which means a 50/50 lateral split 100% of the time.

Its splitting hairs, but it DOES have the ability to limit the amount of wheel spin (not torque) via the brakes... Is it the same, no... but in practice it can work fairly well. My only complaint with the 'virtual' LSD is that it is a little too aggressive with the brakes, but that is more the ABS system then anything else, there is no analog control. Its full on or full off, more or less PWM.
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Old 11-28-2014, 08:10 PM   #25
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Its splitting hairs, but it DOES have the ability to limit the amount of wheel spin (not torque) via the brakes... Is it the same, no... but in practice it can work fairly well. My only complaint with the 'virtual' LSD is that it is a little too aggressive with the brakes, but that is more the ABS system then anything else, there is no analog control. Its full on or full off, more or less PWM.
I just don't see it as splitting hairs. The ability to actually shift torque side to side on a given axle is not even remotely close to being able to limit wheel spin via the brakes.

I didn't say it wasn't useful. I just said it takes a commonly understood term of art, and assigns it to a lesser function.

Notice all the confusion on the this forum alone since its intro?

It's not splitting hairs, it's a ****ty marketing ploy.
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