Subaru 2005 User Manual

Page 16

FOR OVER 30 YEARS,

the Subaru name has been synonymous with All-Wheel Drive (AWD). It is an essential part of the

Subaru experience. So it should come as no surprise that every vehicle we build comes equipped with our

advanced

Symmetrical All-Wheel Drive system. Uniquely

innovative

, it features drivetrain components positioned along a

longitudinal axis and between the

vehicle axles for

optimum balance

and

control. In turn, power is delivered to

all four wheels, and distributed wher-

ever traction is required most. Every

vehicle has its own specific All-

Wheel Drive requirements, however.

So Subaru engineers have thoughtfully developed multiple systems, each with its own distinct advantages. When

integrated with our Subaru Boxer engine and our 4-wheel fully independent suspension, these advanced All-

Wheel Drive systems deliver a level of

performance

, agility and handling that could only come from Subaru.

Symmetrical All-Wheel Drive

Optional on most models

is a smooth-shifting 4-speed
automatic transmission.

A 5-speed manual trans-

mission is standard on most
Impreza models.

IMPREZA WRX STi.

In keeping with its dedication to

uncompromising

performance, the WRX STi uti-

lizes an advanced Driver Controlled Center

Differential (DCCD) All-Wheel Drive sys-

tem. In automatic mode, its planetary

center differential splits the engine

torque, sending 65% to the rear wheels

and 35% to the front. In turn,

an electronically controlled multi-plate

transfer clutch continually

adjusts the torque split for

superb

handling in virtu-

ally all driving conditions.

SUBARU, 1997

Subaru becomes the only manufacturer in the world

to feature standard All-Wheel Drive in its entire vehicle line.

Impreza Models AWD System How It Works

2.5 RS, Outback

Continuous

Utilizing a viscous-center locking differential, normally,

Sport and WRX

power is split 50/50 between the front and rear wheels.

with 5-speed

If wheel slippage occurs, the center differential helps

manual transfer power to the wheels with the best traction.

2.5 RS and

Active

Featuring an electronically managed continuously

Outback Sport

variable multi-plate transfer clutch, this AWD system

with 4-speed

can anticipate slippage and transfer power to the

automatic

front or rear wheels with the best traction.

WRX with

VTD

Variable Torque Distribution (VTD) uses an electron-

4-speed

ically controlled hydraulic transfer clutch in con-

automatic

junction with a planetary gear-type center differential
to control power distribution between the front and rear
wheels. Normally, the VTD system splits power 45% front
and 55% rear, for more of a performance-driving feel.

WRX STi

DCCD

Featuring both manual and automatic modes, Driver

with 6-speed

Controlled Center Differential (DCCD) All-Wheel Drive

manual

uses an electronically managed multi-plate transfer
clutch in conjunction with a planetary gear-type center
differential to control power distribution between the front
and rear wheels. Normally, DCCD splits power 35% front
and 65% rear for an even greater performance-driving feel.