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11-21-2012, 10:01 AM | #14651 | |
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region:
MAIC
Vehicle:2012 Impreza 4DR 5MT |
Quote:
The car knows how much acceleration you're asking for, which way you're pointing the steering wheel, where it's heading, and which wheels are slipping. It also has the ability to reduce engine power and brake any of the four wheels while powering others. All this lets you drive somewhat normally in bad conditions, but it's not magic and you can still lose the car in a ditch. Subaru warns not to become overly confident.
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11-21-2012, 11:38 AM | #14652 | |
Scooby Specialist
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:2008 STI Boost Wagon 2014 Honda Accord Hybrid |
Quote:
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11-21-2012, 11:39 AM | #14653 |
Scooby Specialist
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:2008 STI Boost Wagon 2014 Honda Accord Hybrid |
Also, sorry I wasn't clear in my original post. The front and rear LSD is on the STI not on the 2.0i
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11-22-2012, 02:04 AM | #14654 |
Scooby Newbie
Member#: 333201
Join Date: Sep 2012
Location: Boston, MA
Vehicle:2013 Impreza sport l DGM |
So today I filled up my subie with gas and as I drove home the Eco mileage gauge needle on the bottom of the speedometer stop working? I stopped the engine and restarted twice but still doesn't work. The needle moves when i start her up but then when i put it in drive it does not move anymore. Weird.... Anyone have that happened? Since my first service is not due for another 2500 miles (3750) I though I would wait to have it looked at. Anyone perceive any harm in waiting? I mean as far the actual mileage calculation and what not? Kind of a buzz kill on a 2013 car.
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11-22-2012, 02:20 AM | #14655 | |
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Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
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11-22-2012, 02:43 AM | #14656 |
Scooby Specialist
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:2008 STI Boost Wagon 2014 Honda Accord Hybrid |
It takes exactly 1 mile for it to register after resetting the trip odometer.
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11-22-2012, 03:20 AM | #14657 |
Scooby Newbie
Member#: 326540
Join Date: Jul 2012
Chapter/Region:
BAIC
Location: Oakland, CA
Vehicle:2012 Impreza MT SP DGM |
You guys are saying open diffs f/r with a 50/50 split LSD center diff right? There's so LSD between the wheels like you'd be familiar with on a 4x4 setup. Just making sure we're all on the same page.
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11-22-2012, 08:04 AM | #14658 |
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Member#: 299286
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2017 Legacy Limited White |
There is no LSD, but there is ABS and VDC which essentially means the car sends power to the wheels with grip, and cuts power to wheels that slip.
It is pretty efficient, no matter what the situation, perhaps the limitation is true off road driving (how many people actually drive their impreza offroad in the woods?) Watch the video, a CVT Crosstrek that is pretty impressive, even with a wheel off the ground the Crosstrek did not miss a beat -- better than a 4X4 land rover wheel slip wise: |
11-22-2012, 10:35 AM | #14659 |
Scooby Specialist
Member#: 315631
Join Date: Apr 2012
Location: Bryant, AR
Vehicle:2012 Impreza Sport |
old video
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11-22-2012, 10:44 AM | #14660 | |
Scooby Specialist
Member#: 75071
Join Date: Nov 2004
Chapter/Region:
Tri-State
Location: Long Island
Vehicle:23 Solterra,ModelY Old: 05 08 11 WRX, 18 STI |
Quote:
Front diff - open. If one tire slips VDC will brake it. Center diff - "Continuous AWD" is a viscous coupling type where metal plates are spinning (one set connected to the front axle shaft, other to the rear shaft) in a viscous fluid. Under normal conditions the axles both spin at an equal rate, leaving the normal 50:50 split. Once you lose traction on either axle the free spinning motion will spin those plates faster than the other set. This difference in speeds will cause friction and heat in the differential which hardens the viscous fluid. As it hardens it forces the faster spinning plates to slow until the entire diff is 50:50 again. This is a VERY good system and I have never been stuck in snow (05 WRX, 08 WRX, 11 WRX). Rear diff - open. If one tire slips VDC will brake it. For USDM CVT and 4EAT: Front - Open. Center - "Active AWD" The torque distribution is constantly changing as the ECU takes multiple sensors into account. Once conditions arise that change the throttle position, yaw, steering angle, tire slip, etc, multiple clutch plates are hydraulically pressed together to alter the amount of power diverted from front to rear. SOJ and SCI say it is 60:40 normally, up to 50:50. SOA refuses to say. It is however superior to other car makers as it does not always wait for a slipping wheel, even pressing the gas pedal will transfer torque. Rear - Open. VDC Tip: If you are in deep snow, like coming out of a parking space, going up a steep road that isnt cleared or doing donuts, I would suggest turning OFF VDC as it will reduce engine torque as it senses slipping (to slow the wheel) but that will just bog the engine and you wont have the power needed. Turn it OFF and let the center differential do all the work. As I've said, I've never been stuck with it OFF. |
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11-22-2012, 11:12 AM | #14661 |
Scooby Newbie
Member#: 333201
Join Date: Sep 2012
Location: Boston, MA
Vehicle:2013 Impreza sport l DGM |
I have driven it less then one mile. I never noticed that it stopped working after resetting the trip. So I will see if that's the case. Thanks for bringing that to my attention. I'll know today when I drive around.
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11-22-2012, 11:26 AM | #14662 | |
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Member#: 299286
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2017 Legacy Limited White |
Quote:
Then they continually adjust (usually when they first display the MPG's are very low and climb over the next 5-10 miles till it levels out) |
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11-22-2012, 11:43 AM | #14663 | |
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Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
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11-22-2012, 11:49 AM | #14664 |
Scooby Specialist
Member#: 75071
Join Date: Nov 2004
Chapter/Region:
Tri-State
Location: Long Island
Vehicle:23 Solterra,ModelY Old: 05 08 11 WRX, 18 STI |
VDC off *IS* the button on the dash. The button turns off the engine reduction function and TCS (or at least reduces it to an undetectable level). With the button ON the engine will slow as soon as there is slipping, the swerve light will turn on. With the button OFF nothing happens besides normal driving, enjoy the snow or track.
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11-22-2012, 12:04 PM | #14665 | |
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region:
MAIC
Vehicle:2012 Impreza 4DR 5MT |
The manual says:
Quote:
The manual also claims that when VDC is disabled, the car behaves like one without VDC, but if it's still firing the brakes, this isn't true. When VDC is reducing throttle, the light is steady. |
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11-22-2012, 02:54 PM | #14666 |
Scooby Specialist
Member#: 75071
Join Date: Nov 2004
Chapter/Region:
Tri-State
Location: Long Island
Vehicle:23 Solterra,ModelY Old: 05 08 11 WRX, 18 STI |
I've had VDC since 2008 and when you press the button, even in deep snow or at the track, the light stays off and the power doesn't decrease. The braking is never felt, so I don't know if it's happening.
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11-22-2012, 03:10 PM | #14667 |
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region:
MAIC
Vehicle:2012 Impreza 4DR 5MT |
Does your 08 manual mention anything like what I quoted above? The system may have evolved since then.
There's no missing the pulsed braking, it makes the entire car ring. |
11-22-2012, 03:54 PM | #14668 |
Scooby Specialist
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:2008 STI Boost Wagon 2014 Honda Accord Hybrid |
For my STI if you press the VDC button, it turns off traction control, if you press and hold it it turns off the VDC. Probably different for the '12 Impreza.
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11-22-2012, 05:26 PM | #14669 | |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
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11-22-2012, 06:17 PM | #14670 | ||
Scooby Specialist
Member#: 75071
Join Date: Nov 2004
Chapter/Region:
Tri-State
Location: Long Island
Vehicle:23 Solterra,ModelY Old: 05 08 11 WRX, 18 STI |
Quote:
Quote:
Are you sure you didn't feel the pulse of ABS? That is not VDC. |
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11-22-2012, 09:28 PM | #14671 | ||
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region:
MAIC
Vehicle:2012 Impreza 4DR 5MT |
Quote:
Quote:
The manual confirms what flyboy is saying. The skid logo can appear while the VDC OFF light is lit. |
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11-22-2012, 09:30 PM | #14672 |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
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11-23-2012, 09:43 AM | #14673 |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
i know the stock tires are no good on ice, but everything was really slippery last night and every time i tried to accelerate the back end wanted to swing out on me. would putting some weight back there help? like people do with pickups?
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11-23-2012, 11:13 AM | #14674 |
Scooby Newbie
Member#: 333201
Join Date: Sep 2012
Location: Boston, MA
Vehicle:2013 Impreza sport l DGM |
You guys are absolutely correct. I guess I never noticed that before. It started working again at exactly 1 mile. Chalk it up to my being a subie newbie. Thanks for your response everyone.
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11-23-2012, 03:14 PM | #14675 | |
Scooby Newbie
Member#: 315883
Join Date: Apr 2012
Chapter/Region:
E. Canada
Vehicle:2012 IMPREZA Silver |
Quote:
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