View Single Post
Old 10-19-2000, 05:19 AM   #8
T-WRX
Scooby Specialist
 
Member#: 2468
Join Date: Sep 2000
Chapter/Region: South East
Location: JAX
Vehicle:
08 RS4
05 STi - Gone

Post

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.
* Registered users of the site do not see these ads.
T-WRX is offline