Is The WRX AWD? | Subaru’s Symmetrical Drive

Yes, every Subaru WRX, from its inception, has featured and continues to feature Subaru’s renowned Symmetrical All-Wheel Drive system as standard.

Stepping into the world of performance cars often brings questions about how they put power to the pavement. For many, the Subaru WRX stands out, not just for its rally heritage but for its distinct drivetrain.

Let’s peel back the layers and understand what makes the WRX grip the road with such tenacity.

The Core Truth: Is The WRX AWD? — Unpacking Subaru’s Symmetrical System

The answer is a resounding yes. Every single WRX model ever sold in the US has come equipped with Subaru’s Symmetrical All-Wheel Drive system.

This isn’t an optional upgrade; it’s a fundamental part of the car’s engineering and performance identity.

Unlike many systems that only engage all four wheels when slip is detected, Symmetrical AWD is a full-time, always-on system.

Power is continuously sent to all four wheels, providing constant traction and stability.

The “symmetrical” part refers to the horizontally opposed Boxer engine and the drivetrain components being laid out in a straight line, creating a balanced, low center of gravity.

This balanced design contributes significantly to the WRX’s handling characteristics.

A Legacy of Grip: WRX AWD Through the Generations

The WRX’s all-wheel-drive system has evolved over the years, becoming more sophisticated with each generation.

While the core principle of constant power to all four wheels remains, the methods of power distribution and control have seen significant advancements.

Early WRX models often featured simpler viscous coupling center differentials.

Later iterations introduced more advanced systems, including electronically controlled multi-plate clutches and Subaru’s Driver-Controlled Center Differential (DCCD).

DCCD allows the driver to manually adjust the center differential’s locking behavior, tailoring the power split for different driving conditions or preferences.

Even without DCCD, the standard Symmetrical AWD systems employ various mechanisms to manage torque distribution effectively.

Evolution of WRX AWD Systems

Different WRX models and generations have utilized distinct AWD configurations:

• Manual Transmission WRX: Often features a viscous-coupling center differential or, in higher-performance STI models, the DCCD system.
• Automatic Transmission WRX (e.g., WRX with Subaru Performance Transmission): Typically uses an electronically controlled multi-plate transfer clutch to manage torque distribution.

Each setup is designed to provide optimal traction and handling for its specific application.

Key AWD System Features by Generation (Illustrative)

Here’s a simplified look at how the core AWD technology has progressed in the WRX:

Generation Era	Primary AWD System	Typical Power Split (Front/Rear)
Early 2000s	Viscous Center Differential	50/50 (Nominal)
Mid-2000s to Present	Planetary Gear/Electronic Clutch (Manual)	41/59 (Nominal, MT)
Mid-2000s to Present	Variable Torque Distribution (CVT/SPT)	45/55 (Nominal, AT)

These nominal splits can dynamically change based on traction conditions and driver input, thanks to the system’s ability to transfer torque.

More Than Just Snow: The Real-World Benefits of WRX AWD

While AWD is often associated with adverse weather, its advantages extend far beyond snowy roads.

The WRX’s Symmetrical AWD system provides tangible benefits in a wide range of driving scenarios across the US.

Enhanced Traction and Stability

On wet roads, gravel, or even dry pavement, the continuous power to all four wheels helps maintain grip.

When one wheel begins to lose traction, the system can quickly redistribute power to the wheels with more grip.

This translates to better control and a more confident driving feel, especially when accelerating or navigating challenging surfaces.

Improved Performance Dynamics

The even distribution of power and weight contributes to the WRX’s agile handling.

During cornering, AWD helps pull the car through turns, reducing understeer and allowing for higher cornering speeds.

It also aids in launching the car off the line, minimizing wheel spin and maximizing acceleration.

Safety and Confidence

The inherent stability of Symmetrical AWD is a significant safety feature.

It helps the driver maintain control during sudden maneuvers or unexpected road conditions.

This added layer of control can be particularly reassuring for drivers encountering varied climates or winding roads.

Understanding the Mechanical Heart: How WRX AWD Works

The magic of the WRX’s Symmetrical All-Wheel Drive lies in its mechanical components working in concert.

It starts with the engine, which powers the transmission, and from there, the power is directed through a series of differentials.

The Role of Differentials

A differential is a mechanical device that allows wheels on the same axle to rotate at different speeds, which is essential for turning.

The WRX has a front differential, a rear differential, and a crucial center differential.

The center differential is responsible for distributing power between the front and rear axles.

In a Symmetrical AWD system, this center differential is always active, ensuring power reaches all four wheels.

Power Distribution and Control

Depending on the specific WRX model and transmission, the center differential might be a simple viscous coupling, a more complex planetary gear set, or an electronically controlled multi-plate clutch.

These systems work to send torque where it’s most needed, preventing individual wheels from spinning freely.

Modern WRX models also incorporate electronic aids like Vehicle Dynamics Control (VDC) and Active Torque Vectoring (ATV).

VDC monitors wheel speed, steering angle, and yaw rate, applying individual brakes or reducing engine power to help maintain stability.

ATV uses the brakes to lightly slow an inside wheel during cornering, sending more power to the outside wheel and helping the car pivot more sharply.

AWD Maintenance and Care for Your WRX

Maintaining your WRX’s AWD system ensures its longevity and performance.

Like any sophisticated mechanical system, it requires regular attention and proper care.

Tire Management is Key

One of the most important aspects of AWD care is tire maintenance.

It’s vital to use tires of the same brand, model, size, and tread depth on all four wheels.

Significant differences in tire circumference can cause stress and premature wear on the differentials and transfer case.

Regular tire rotations are also important to ensure even wear across all four tires.

Fluid Changes and Inspections

The differentials (front and rear) and the transmission/transfer case contain specialized fluids.

These fluids lubricate components, dissipate heat, and protect against wear.

Following Subaru’s recommended service intervals for fluid changes is essential for the health of your AWD system.

During routine service, mechanics should inspect drive shafts, CV joints, and boots for any signs of wear or damage.

Key AWD Maintenance Intervals (General Guideline)

Always refer to your WRX’s owner’s manual for precise maintenance schedules.

Component	Typical Interval (Miles)	Note
Differential Fluid (Front/Rear)	30,000 – 60,000	More frequent for heavy use.
Transmission Fluid (MT/AT)	30,000 – 60,000	Crucial for transfer case health.
Tire Rotation	5,000 – 7,500	Promotes even wear, extends tire life.

Neglecting these simple maintenance steps can lead to costly repairs down the road.

A well-maintained AWD system is a reliable system, ready to tackle any road conditions.

The WRX’s Symmetrical AWD is a cornerstone of its performance and safety, a feature deeply ingrained in its DNA.

Understanding how it works and how to care for it helps you get the most out of your driving machine.

Is The WRX AWD? — FAQs

Does the WRX STI also have AWD?

Yes, absolutely. The Subaru WRX STI, which historically represented the highest performance variant of the WRX, always came standard with Subaru’s Symmetrical All-Wheel Drive.

STI models often featured a more advanced version, specifically the Driver-Controlled Center Differential (DCCD), allowing for manual adjustment of torque distribution.

This system provided even greater control and customization for performance driving.

Is WRX AWD full-time or part-time?

The WRX’s Symmetrical All-Wheel Drive is a full-time system, meaning power is continuously sent to all four wheels.

It is not a part-time or on-demand system that only engages AWD when slip is detected.

This constant engagement provides immediate traction and stability, contributing to the WRX’s predictable handling characteristics in all conditions.

What makes Subaru’s Symmetrical AWD different from other AWD systems?

Subaru’s Symmetrical AWD is unique due to its horizontally opposed Boxer engine and drivetrain components being aligned in a straight line.

This layout creates a balanced weight distribution and a low center of gravity, which enhances stability and handling.

Many other AWD systems often add components to a front-wheel-drive or rear-wheel-drive platform, which can result in less inherent balance.

Can I put different sized tires on my WRX with AWD?

No, it is strongly advised against using different sized tires on a WRX with AWD.

The AWD system relies on all four tires having virtually identical rolling circumferences to function correctly.

Significant differences in tire size or tread depth can cause stress and premature wear on the differentials and transfer case, leading to expensive repairs.

Does AWD in the WRX affect its fuel economy?

Yes, the presence of an AWD system generally results in slightly lower fuel economy compared to a comparable two-wheel-drive vehicle.

The additional drivetrain components add weight and create more internal friction, requiring more energy to move the vehicle.

However, many WRX owners find the enhanced traction, performance, and safety benefits outweigh this minor difference in fuel consumption.