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Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

Mazda MX-5 breeds upgraded Roadster RS in Japan

Fans of the new Mazda MX-5 Miata looking for something a little more performance-focused may be enticed by the new RS model. Unfortunately they'll have to go all the way to Japan to get it. Because Mazda will only be offering this particular version back home. The new RS version of the Mazda Roadster (as it's known in Japan) features a number of performance upgrades, although none of them specifically affect the engine or its output. The Roadster RS features Bilstein dampers and front suspension tower brace for better handling, along with bigger brakes for added stopping power, a retuned steering rack for sharper turn-in, and upgraded exhaust for a better sound. Inside it's also been treated to heated Recaro seats with Nappa leather and Alcantara trim and a nine-speaker Bose audio system. It also comes equipped with adaptive front lighting and high-beam control as well as lane-departure and blind-spot warning systems. Feeling left out yet? Don't be too disappointed, or book that ticket to Tokyo's Natita International Airport just yet. The Mazda Roadster RS only comes with the smaller 1.5-liter engine that produces 129 horsepower, which is significantly less than the 2.0L we get here at 155 hp. It does, however, come with the six-speed manual instead of the automatic. So while this may not be the most powerful version of the Miata, it may be the enthusiast favorite – at least in the JDM. Related Video:

Mazda specs new MX-5 Miata with accessories

It's been 26 years since Mazda showcased the original Miata at the Chicago Auto Show, and now it's returned with a conceptual take on the new model, decked out with all the accessories and optional equipment your roadster-loving heart could desire. Or at least some of 'em, anyway. This show car is painted Ceramic Metallic (Zoom Zoom-speak for "white") and spec'd out with a full aero kit (including front air dam, side sills, rear skirt and lip spoiler) all done up in gloss black, 17-inch BBS wheels and Brembo brakes with red calipers. Mazda is also showcasing a carbon-fiber luggage rack for the new MX-5 that weighs less than two pounds and includes and integrated brake light. "The concept parts and accessories we have showcased at the Chicago Auto Show," said Mazda's North American chief Jim O'Sullivan, "were developed to give customers a look at what is possible for the new cars to make them truly one-of-a-kind, adding to that excitement." See them shown off in our high-res gallery of live photos, above. MAZDA UNVEILS 2016 MX-5 MIATA ACCESSORIES CONCEPT DESIGN AT CHICAGO AUTO SHOW CHICAGO, Feb. 12, 2015 -- The only thing better than the all-new 2016 Mazda MX-5 Miata is a personalized 2016 Mazda MX-5 Miata. Today at the Chicago Auto Show, where the first-generation MX-5 Miata was introduced to the world in 1989, Mazda revealed an MX-5 accessories design concept of the next-generation roadster that will hit showrooms this summer. At the Chicago Auto Show, Mazda revealed a 2016 Mazda MX-5 Miata accessories design concept for the next-generation roadster that will hit showrooms this summer. "There is so much MX-5 history at the Chicago Auto Show, and we wanted to continue building on that," said Jim O'Sullivan, president and CEO, Mazda North American Operations. "The MX-5 is the soul of our company, and its enthusiast following both inside and outside of Mazda drives us to keep innovating new ideas for it and the rest of our lineup." Painted Ceramic Metallic, the 2016 MX-5 accessories concept will be on display from Thursday, February 12 through Sunday, February 22 and includes an Aero Kit, BBS Wheels and Brembo Brakes as well as a Luggage Rack shown separately in Mazda's display. MX-5 concept accessories include: - Aero Kit (Front Air Dam, Side Sill Extensions, Rear Bumper Skirt and Rear Lip Spoiler): The gloss-black Aero Kit is the same package found on the 2016 MX-5 Global Cup Car that debuted at SEMA in November.