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AWD

Car culture term

What is AWD?

All-wheel drive. Power is delivered to all four wheels, either continuously or on demand based on traction needs.

AWD (all-wheel drive) describes a drivetrain that delivers power to all four wheels. Modern AWD systems are typically computer-controlled and can vary the torque distribution between front and rear axles based on driving conditions. The result is improved traction in wet, snow, gravel, or low-grip conditions, and improved acceleration on dry pavement compared to two-wheel drive.

AWD systems vary widely in design. Subaru Symmetrical AWD and Audi Quattro use mechanical differentials with continuous power split. Most modern AWD passenger cars (Toyota, Honda, Hyundai) use Haldex-style on-demand systems where the rear axle engages only when slip is detected. Performance AWD (Nissan GT-R, Porsche 911 Turbo, Lamborghini Huracan) uses sophisticated electronic torque vectoring for cornering performance.

The downsides of AWD are added weight (typically 100-200 pounds compared to FWD or RWD equivalent), reduced fuel economy, and additional maintenance complexity. AWD is increasingly common as a feature on luxury and performance cars; it is the default on most Subaru models, Audi quattro models, and many modern crossovers.

Related terms

RWDFWD4WD

Frequently asked questions

What is the difference between AWD and 4WD?
AWD is typically full-time and computer-controlled, optimized for on-road traction. 4WD (four-wheel drive) is typically part-time with selectable transfer case (high range, low range), optimized for serious off-road use. Trucks and traditional SUVs use 4WD; cars and crossovers use AWD.
Is AWD faster than RWD?
In low-grip conditions, yes. AWD launches better on wet, snow, or gravel. On dry pavement at high speed, RWD can be faster because of less drivetrain loss. Most modern performance cars (911 Turbo, R8, GT-R) use AWD because the launch advantage outweighs the weight penalty.
Are AWD cars more expensive to maintain?
Generally yes. The center differential or transfer case adds maintenance items (fluid changes, occasional rebuilds). Tire wear can be uneven if not rotated regularly (AWD systems are sensitive to mismatched tire diameters). Insurance and replacement parts cost more.
Can AWD work in snow?
Yes, but proper winter tires matter more than AWD itself. AWD with summer or all-season tires can be inferior to FWD with winter tires in deep snow. AWD plus winter tires is the optimal combination for snow and ice conditions.
Why does Subaru use AWD on everything?
Subaru built its identity around standard AWD on nearly every model since the 1970s. The horizontally opposed boxer engine layout integrates well with longitudinal AWD architecture, and the brand has marketed AWD as a key differentiator in markets with snow or rough roads. Subaru sells almost no FWD or RWD vehicles globally.

AWD on the blog

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