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Old 10-18-2000, 06:57 PM   #1
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Member#: 2465
Join Date: Sep 2000
Post New Impreza with VTD

Just read a post about Outback VTD and whether the New Impreza will get it.

Well I have a Japanese magazine, called "Subaru Impreza: Test Drive Report and Complete Buyser's Guide" (title translated from Japanese), it says that Turbo AT (namely WRX NB with automatic trans.) has VTD system, while MT model (manual) uses "Viscous LSD center diff."
WRX NA uses "Active Torque Split" (translation)...

Well, I may be wrong on the translations.
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Old 10-18-2000, 07:01 PM   #2
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Is that the same as VDC?
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Old 10-18-2000, 07:06 PM   #3
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Old 10-18-2000, 07:08 PM   #4
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Not sure, Japanese uses a lot of abbreviations. I don't even know what VTD stands for. Probably, "variable torque differential"?

This is Japanese Spec. We might get different stuff in america.
By the way, in Japan if you get WRX NB 4-speed auto, you get the "speed-shift"(or manu-matic) for sure, any info on what we'll get here?
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Old 10-18-2000, 07:10 PM   #5
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oops, that's "sport-shift" not "speed" :-)
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Old 10-18-2000, 07:14 PM   #6
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Oh, for the safety issue, the front seats get side airbags too.
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Old 10-18-2000, 11:37 PM   #7
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GC4 -> GGA -> GM6
Yeah, that's about right.


VTD is NOT the same as VDC!

VTD is variable torque distribution all wheel drive. Similar to the existing MPT clutch system in U.S. spec automatic tranny Subarus, except I think it has the ability to actually rear-bias the car (rather than simply lock up the center diff). The turbo automatic wagons in Japan have had this for a long time.

VDC is vehicle dynamics control. This is the ABS-like yaw control system employed on the H6 Outback to correct bonehead maneuvers. Given the option, I would probably pass on this feature since it is likely going to try and prevent me from turning the car in properly to a turn. But I haven't driven it yet, so we'll see if that changes.

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Old 10-19-2000, 05:19 AM   #8
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In AutoWeek's review of the Outback H6, it stated that VDC/VTD will be standard on the New Impreza Turbo.

Here is an explanation:

The Outback H6-3.0 VDC provides unequaled traction and stability using Variable Torque Distribution (VTD) All-Wheel Drive, working in conjunction with the Vehicle Dynamics Control (VDC) system. The VTD and VDC systems operate simultaneously to help maintain traction and stability, and take corrective action before the driver even notices.

The new VTD automatic transmission uses an electronically controlled hydraulic transfer clutch that works with a planetary gear-type center differential to control power distribution between the front and rear wheels. Under most conditions the VTD system splits the power 45 percent front and 55 percent rear. The slight rear-wheel bias enhances the performance driving feel, and the VTD system can vary the power split as needed to respond to road conditions.

Like Active All-Wheel Drive, VTD adjusts the front/rear power split, always helping to ensure that the wheels with the best traction receive the most power.

Vehicle Dynamics Control (VDC) works together with VTD All-Wheel Drive and four-wheel electronic traction control to help maintain directional stability under all driving conditions. The system monitors vehicle stability by continually measuring inputs such as steering angle, yaw rate, lateral g-force and individual wheel speed.

Using that input data, VDC can tell whether the car is going where the driver is steering it. To correct understeer (front-wheel drift), VDC applies split-second brake pressure to the inside rear wheel to help pull the car back on the desired course. To correct oversteer (rear-wheel drift), VDC applies split-second brake pressure to the outside front wheel to bring the rear of the vehicle back in line. Under certain oversteer conditions, VDC can even direct the All-Wheel Drive system to transfer more power to the front wheels. If the situation requires greater intervention, VDC can also direct the engine control module to turn off one or more fuel injectors to reduce power.

The Outback H6-3.0 VDC system adds another layer of driving control -- an all-wheel, all-speed Traction Control System (TCS). Should any wheel spin on a slippery surface, VDC will apply braking force to that wheel to help keep wheel spin under control. Depending on the traction situation, the VDC system can instruct the engine control module to reduce power by turning off one or more fuel injectors. The Outback H6-3.0 VDC can maintain traction even if three wheels are slipping on ice or snow, without the need for a limited-slip differential.
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Old 10-19-2000, 06:05 AM   #9
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Out of the sudden an overly tailhappy old 911 comes to the mind of true drivers.
Cars tend to become less driver oriented(for most moron drivers a good thing),
but also very boring to drive. My old 280Z was a blast to powerslide through a turn.
Lets keep in mind, thats fun driving.
Too much control for me in those new cars.
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Old 10-19-2000, 08:26 AM   #10
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IF the new US/Can Impreza gets VTD and VDC, a VDC off button would be great for more "spirited" driving. But in the litigious(sp?) U.S. - I don't know.
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