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Old 06-13-2011, 04:21 PM   #76
09rexwagon
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I put down 150+ autocross runs in the 1.5 years I owned my 09 and I guarantee you I experienced all the glory that is the open diff with the VDC switch set to 'off'....there was no transfer of drive torque left to right via individual braking of inside wheels. Well why would I turn off VDC then? Well the stability control takes yaw and lateral acceleration as inputs and cuts fuel AND brakes individual corners which drastically slow you down in transition intensive autocross. So no nannys other than ABS is definitely much faster from an autocross perspective even if it brings the full realization of the open differential into focus. Brake late and trail brake and be disciplined on the throttle on turn exit and it's not terrible .
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Old 06-13-2011, 07:02 PM   #77
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Quote:
Originally Posted by FuJi K View Post
Some "Stabilitly/Traction control" systems may flash a alight saying it's off, but really it is NOT off. That's what I wonder if Subaru is doing that as well. If you really want to see, try unhooking an ABS sensor from a corner and pulling the ABS fuse. Then the system will not work at all and you can see the open diff in all it's glory doing what it does best.

THIS, is what im trying to convey to everyone, because simply saying VDC is OFF and only your ABS is working is very misleading, and would definately be misunderstood and taken as only having open diffs again and no help from the abs system to give a lsd type action
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Old 06-13-2011, 07:05 PM   #78
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Originally Posted by jonklein611 View Post
What is there to catch? You're claiming that when you hit the VDC button, that it does NOT disable VDC.

I've show you multiple times, that is not true.

Here, I'll even break it down by model:

Vehicle Dynamics Control

OFF switch (except STI) Pressing the switch to deactivate the Vehicle Dynamics Control system can facilitate the following operations:

. a standing start on a steeply sloping road with a snowy, gravel-covered, or otherwise slippery surface
. extrication of the vehicle when its wheels are stuck in mud or deep snow

When the switch is pressed during engine operation, the Vehicle Dynamics Control OFF indicator light “ ” on the combination meter illuminates. The Vehicle Dynamics Control system will be deactivated and the vehicle will behave like a model not equipped with the Vehicle Dynamics Control system. When the switch is pressed again to reactivate the Vehicle Dynamics Control system, the Vehicle Dynamics Control OFF indicator light “ ” turns off. With the Vehicle Dynamics Control system deactivated, traction and stability enhancement offered by Vehicle Dynamics Control system is unavailable. Therefore you should not deactivate the Vehicle Dynamics Control system except under above-mentioned situations.

NOTE
. When the switch has been pressed to deactivate the Vehicle Dynamics Control system, the Vehicle Dynamics Control system automatically reactivates itself the next time the ignition switch is turned to the “LOCK” position and the engine is restarted.
. If the switch is held down for 10 seconds or longer, the indicator light turns off, the Vehicle Dynamics Control system is activated, and the system ignores any further pressing of the switch. To make the switch usable again, turn the ignition switch to the “LOCK” position and restart the engine.
. When the switch is pressed to deactivate the Vehicle Dynamics Control system, the vehicle’s running performance is comparable with that of a vehicle that does not have a Vehicle Dynamics Control system. Do not deactivate the Vehicle Dynamics Control system except when absolutely necessary.
. Even when the Vehicle Dynamics Control system is deactivated, components of the brake control system may still activate. When the brake control system is activated, the Vehicle Dynamics Control operation indicator light illuminates.


Vehicle Dynamics Control mode switch (STI)

When the switch is pressed briefly or for more than approximately 3 seconds during engine operation, the mode of the Vehicle Dynamics Control System will be changed.

! Vehicle Dynamics Control mode
When the ignition switch is on, this mode is selected.
This mode enables all controls for ABS, the Traction Control System, and the Vehicle Dynamics Control system. Select this mode for most driving situations. When this mode is selected, the indicator light “ ” on the combination meter turns off.

! Traction mode
This mode restricts the functions of the Traction Control System and Vehicle Dynamics Control system and thus delays utilizing their functions as a reaction to vehicle behavior in comparison with the Vehicle Dynamics Control mode. This mode should be used in driving situations where the vehicle dynamic performance will improve without decreasing engine torque control. When the switch is pressed briefly during engine operation, the indicator light “ ” on the combination meter illuminates in green. When the switch is pressed again to reactivate the Vehicle Dynamics Control system, the indicator light “ ” turns off.


! Vehicle Dynamics Control OFF mode

This mode allows only the ABS control.

This mode should be used in an emergency situation such as getting out of snow or mud.

When the switch is pressed for more than approximately 3 seconds during engine operation, the indicator light “ ” on the combination meter illuminates in yellow. When the switch is pressed again to reactivate the Vehicle Dynamics Control system, the indicator light “ ” turns off.

NOTE

. When a mode other than the Vehicle Dynamics Control mode is selected, the Vehicle Dynamics Control system automatically reactivates itself the next time the ignition switch is turned to the “LOCK” position and the engine is restarted.

. If the switch is held down for 10 seconds or longer, the indicator light turns off, the Vehicle Dynamics Control system is activated, and the system ignores any further pressing of the switch. To make the switch usable again, turn the ignition switch to the “LOCK” position and restart the engine.

. When the Vehicle Dynamics Control OFF mode is selected, the vehicle’s running performance is comparable with that of a vehicle that does not have a Vehicle Dynamics Control system. Do not deactivate the Vehicle Dynamics Control system except when absolutely necessary.

. Even when the Vehicle Dynamics Control OFF mode is selected, components of the brake control system may still activate. When the brake control system is activated, the Vehicle Dynamics Control operation indicator light illuminates.



Now what you have been experiencing is that last bullet point. ABS can still come in and do all sorts of stuff, but it is not the VDC system. It's not using any of the VDC inputs, simply the ABS system inputs.

how come when i simply press the button , ive never ever seen a "VDC off" light, only the little car with sguigily lines behind it and a cross through it lights up.thats what im referring to
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Old 06-13-2011, 07:14 PM   #79
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Quote:
Originally Posted by WRrexu View Post
how come when i simply press the button , ive never ever seen a "VDC off" light, only the little car with sguigily lines behind it and a cross through it lights up.thats what im referring to
That is the VDC OFF light...
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Old 06-13-2011, 07:29 PM   #80
WRrexu
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Quote:
Originally Posted by jonklein611 View Post
That is the VDC OFF light...


NOW IM BACK TO SQUARE ONE. ok to prove that when that light is on its not open differentials 100% ill put the car on jack stands and hold one wheel and youll all see !! it wont be soon but ill do it just to prove a point.

Last edited by WRrexu; 06-14-2011 at 08:18 PM.
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Old 06-13-2011, 10:35 PM   #81
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Quote:
Originally Posted by WRrexu View Post
NOW IM BACK TO SQUARE ONE. ok to prove that when that light is on its not open differentials 100% ill put the car on jack stands and hold wheel and youll all see !! it wont be in soon but ill do it just to prove a point.
make sure to wear loose fitting clothes and a tie...

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Old 04-19-2012, 03:19 AM   #82
RoidRage
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Totally resurrecting this!

Has anyone found and answer to the "TCS off button = open front and rear diffs on 08+ WRX" question? I tried to get Cobb to let me put mien up on the dyno with 2 wheels jacked up to test it... they weren't having it lol.

Also would be intrested to hear about anyone else with LSDs on the 08+. What they used/impressions. Would be nice to find a good replacement for the center diff as well.
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Old 04-28-2012, 07:01 AM   #83
Lrn2Corner
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do your self a favor, go to a local autox event. press the VDC button once before you start your run. drive the piss out of your car and notice that it doesnt bog or pull punches as you corner aggressively.

Turn it back on and do your next run. notice your time is drastically slower due to VDC cutting you off most of the time during cornering maneuvers and so on.

You are running full open diff mode with VDC off. VDC is not reducing wheel spin or traction loss. The center diff is doing its job, which is deviding up the power to the wheels that can make the best use of it.

Thanks for the rez i was looking for what models and what ratio I needed to get a VLSD from.
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Old 04-28-2012, 10:03 PM   #84
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Quote:
Originally Posted by Lrn2Corner View Post
do your self a favor, go to a local autox event. press the VDC button once before you start your run. drive the piss out of your car and notice that it doesnt bog or pull punches as you corner aggressively.

Turn it back on and do your next run. notice your time is drastically slower due to VDC cutting you off most of the time during cornering maneuvers and so on.

You are running full open diff mode with VDC off. VDC is not reducing wheel spin or traction loss. The center diff is doing its job, which is deviding up the power to the wheels that can make the best use of it.

Thanks for the rez i was looking for what models and what ratio I needed to get a VLSD from.

Yeah I notice the power cut for sure, but I don't think im experienced enough to really tell if the diffs are just running open or are still geing some simulated LSD action via the brakes.
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Old 04-28-2012, 10:51 PM   #85
moonrider_99
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Quote:
Originally Posted by Lrn2Corner
do your self a favor, go to a local autox event. press the VDC button once before you start your run. drive the piss out of your car and notice that it doesnt bog or pull punches as you corner aggressively.

Turn it back on and do your next run. notice your time is drastically slower due to VDC cutting you off most of the time during cornering maneuvers and so on.

You are running full open diff mode with VDC off. VDC is not reducing wheel spin or traction loss. The center diff is doing its job, which is deviding up the power to the wheels that can make the best use of it.

Thanks for the rez i was looking for what models and what ratio I needed to get a VLSD from.
I autox and sometimes i forget to turn the vcd off and i did experience all of the above. Vcd off is much better I do dislike my open diffs on corner exits though.... terrible loss of grip/wheel spin of inside wheel. I also do not like the central viscous unit in the winter. So slow to lock up...

Last edited by moonrider_99; 04-28-2012 at 11:01 PM.
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Old 05-03-2012, 08:16 AM   #86
Lrn2Corner
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Quote:
Originally Posted by moonrider_99 View Post
I autox and sometimes i forget to turn the vcd off and i did experience all of the above. Vcd off is much better I do dislike my open diffs on corner exits though.... terrible loss of grip/wheel spin of inside wheel. I also do not like the central viscous unit in the winter. So slow to lock up...
Yeah I know what you mean. It gets a little annoying living in alaska and having to wait for the center diff to actually go into full lock.

The rear VLSD is not much better but in the end if you know how to push it you can use it to get better times, it is generally meant for crap weather and off road use.

Finding a 3.9 VLSD is like pulling teeth along with finding a complete set of Subaru 4 and 2 pot calipers off a WRX to swap on.
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Old 04-08-2013, 04:14 AM   #87
Vanderkitten
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For track, rear LSD like the Cusco or Quaife is the ticket. Easy to install (front has to split the tranny case) and will increase oversteer to make rotating the car easier.

It would also make doing donuts in the snow better.

VDC is for grand mothers and insurance companies, not to make your car to around a track faster.
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Old 04-08-2013, 10:41 AM   #88
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Quote:
Originally Posted by Vanderkitten
For track, rear LSD like the Cusco or Quaife is the ticket. Easy to install (front has to split the tranny case) and will increase oversteer to make rotating the car easier.

It would also make doing donuts in the snow better.

VDC is for grand mothers and insurance companies, not to make your car to around a track faster.
That is the correct answer
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Old 04-09-2013, 02:21 PM   #89
DisrupTer911
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Does adding a Quaife or Cusco LSD in the rear cause issues with the sensor systems detecting incorrectly?

What about adding one to the front?

Is there anything you can do about the center diff? can it be swapped out to a mechanical diff as well?
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Old 04-09-2013, 03:03 PM   #90
FuJi K
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Quote:
Originally Posted by DisrupTer911
Does adding a Quaife or Cusco LSD in the rear cause issues with the sensor systems detecting incorrectly?

What about adding one to the front?

Is there anything you can do about the center diff? can it be swapped out to a mechanical diff as well?
The sensors read wheel speed at the ABS sensors. It doesn't know there's a LSD in or not.
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Old 04-09-2013, 04:55 PM   #91
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Good to know. Thanks!
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Old 07-21-2013, 07:24 AM   #92
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Lightbulb 2011 WRX has rear LSD confirmed Australia model

Quote:
Originally Posted by jonklein611 View Post
Have you seen the price of an Australian WRX / STI? You would no longer be perturbed.
Hey all,

Confirm that the 2011 WRX has rear LSD. Below is the Subaru official web site: http://www.subaru.com.au/wrx/premium-sedan/features

Under Chassis and Mechanism.
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Old 07-22-2013, 05:03 PM   #93
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Originally Posted by Prodoco View Post
Hey all,

Confirm that the 2011 WRX has rear LSD. Below is the Subaru official web site: http://www.subaru.com.au/wrx/premium-sedan/features

Under Chassis and Mechanism.
Looks like friends from Australia are getting a nice upgrade, none of this here in North America.
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Old 07-23-2013, 12:37 PM   #94
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I wonder if the wrxs in australia cost more too.
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Old 07-23-2013, 03:27 PM   #95
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Originally Posted by DONx3 View Post
I wonder if the wrxs in australia cost more too.
In general, cars are more expensive there.
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Old 07-24-2013, 08:06 AM   #96
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Quote:
Originally Posted by Lrn2Corner View Post
is like pulling teeth along with finding a complete set of Subaru 4 and 2 pot calipers off a WRX to swap on.
i found a 4 pot/2 pot GC Sti set, black w raised letters. jealous.
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Old 07-26-2013, 09:36 AM   #97
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Quote:
Originally Posted by DONx3 View Post
I wonder if the wrxs in australia cost more too.
Australia WRX drive away price is around $43000 USD for Premium WRX.
And 65000 USD for STI drive away.
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Old 08-07-2013, 04:53 PM   #98
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Soo if i wanted to do an lsd in the rear on my 2011 wrx would i need to disable the ghetto vdc which acts as a dif of sorts? Will the 2 mess with eachother and cause problems down the road? I autox regularly and the car tries to control the slide and its super annoying even with the traction control off the vdc still is on. The only way to really get it to slide decently is to get it way out to the point the computer basically stops trying but this is not helping times. I know some people say to disable the steering angle sensor and that kills the vdc but keeps ABS which is good i dont want abs lights and cel codes and everything i do street the car. I dont care if vdc is permanently disabled either as long as the car still functions normally
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Old 08-07-2013, 05:17 PM   #99
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Pull the ABS solenoid and everything is off. You're 1:1 then. If a little light on the dash is annoying, don't touch anything, leave the car stock.
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Old 08-07-2013, 09:44 PM   #100
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Id rather not disable abs just the simulated lsd crap. And put in a real lsd. I know people have done diaabled the steering angle sensor which kills input to the Gsensor and stuff that activates the simulated lsd. i just dont know what other side effects there are if any. I also dont know how to disable said sensor so anyone whos done it i would appreciate input
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