What is Subaru X-MODE?

X-MODE Features

When in use, X-MODE engages the following key systems within your Subaru, making crucial adjustments to keep you safe and provide exceptional grip and control.

Engine Throttle Response

Often our instinct is to apply more power to the accelerator when we are stuck in ice, snow, or mud. Unfortunately, this can deliver too much torque at once, resulting in the throttle opening up too quickly and creating rapid wheelspin with no traction. With X-MODE activated, the engine will deliver torque gradually—even if you floor it!—until the sensors detect that the wheels have achieved sufficient grip, and only then allow the wheels to receive stronger torque and acceleration.

Transmission

On steep hills or challenging terrain like sand, X-MODE forces the transmission to remain in a lower gear in order to maximize power delivery. This is the same principle used in 4WD manual transmission vehicles when off-roading, but X-MODE executes it responsively at the push of a button, without having to shift down manually.

AWD System

Subaru vehicles improve on the already outstanding AWD system by increasing the front/rear coupling force, splitting power more evenly between the front and rear sets of tires. This maximizes traction at crucial moments.

VDC System

With X-MODE in use, the Vehicle Dynamics Control (VDC) system provides enhanced Limited-Slip Differential (LSD) control. This means that braking is applied much faster and only to the wheels that need it most because they are slipping or spinning without traction.

Hill Descent Control

Hill Descent Control (HDC) is a useful feature of X-MODE. When driving down a steep hill with X-MODE engaged, HDC manages throttling and braking automatically, keeping your Subaru steady while you focus solely on steering. Note that HDC only functions below 12 mph.

Reducing greenhouse gas emissions is not simply a case of switching cars to electric power–at least until the whole world runs on renewable energy. That’s why Mazda is taking a “well-to-wheel” approach to reducing emissions, considering fuel extraction, manufacturing, and shipping as well as driving. One part of this bold plan is a revolutionary new combustion engine. Mazda calls it SKYACTIV-X.

What is SKYACTIV-X?

SKYACTIV-X is a revolutionary engine, a world first. It employs a method of combustion—compression ignition—that the combined might of the motoring sector has been trying to master for over two decades.

Why SKYACTIV-X is a defining moment for the industry?

The development of this technology comes from Mazda’s “well-to-wheel” approach, which considers real-world emissions over a car’s entire life cycle. Of course, Mazda plans to introduce electric vehicles to areas that have clean energy sources and will add hybrid and plug-in vehicles from 2020, but the internal combustion engine will continue to be the base power unit for 85 percent of all cars up until 2035. That’s why SKYACTIV-X is such an important breakthrough in Mazda’s goal to reduce “well-to-wheel” carbon dioxide emissions to 50 percent of 2010 levels by 2030, and a staggering 90 percent reduction by 2050.

Here's how the SKYACTIV-X works...

In a gasoline engine, the fuel-air mixture is ignited by a spark from the spark plug. In a diesel engine, the fuel-air mix is compressed and ignites through pressure and heat alone. Diesel is more energy dense than gasoline, which also means more air and less fuel goes in, making for better fuel economy. And although diesel engines tend to release less carbon dioxide than gasoline engines, they emit particulates that, unless trapped or treated, can cause pollution. Diesels, which are often turbocharged, have a reputation for having lots of torque even at low revs, while gasoline engines can rev higher and produce more horsepower at those high revs.

SKYACTIV-X offers the best of both diesel and gasoline engines with none of the disadvantages. It does this thanks to a new technology called Spark Controlled Compression Ignition (SPCCI). Running on regular gasoline, SPCCI works by compressing the fuel-air mix at a much higher compression ratio, with a very lean mix. The SKYACTIV-X engine uses a spark to ignite only a small, dense amount of the fuel-air mix in the cylinder. This raises the temperature and pressure so that the remaining fuel-air mix ignites under pressure (like a diesel), burning faster and more completely than in conventional engines.

The many benefits of SKYACTIV-X: click on the buttons below to find out more.