2011 Mazda 3 S Sedan 4-door 2.5l on 2040-cars

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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.

Tesla Model Y and Cadillac CT5 | Autoblog Podcast #573

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski and Associate Editor Joel Stocksdale. They catch up on the Tesla Model Y, as well as the Cadillac CT5 and the brand's new naming structure. Afterward they talk about our driving the 2019 Mazda3, 2019 Volkswagen Golf GTI and 2019 Ford Ranger. Finally, the three editors take a lap around eBay looking for the best ways to spend $15,000 on a car. Autoblog Podcast #573 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Tesla Model Y unveiled Cadillac CT5 and Cadillac's new badging strategy Cars we're driving: 2019 Mazda3 2019 VW Golf GTI 2019 Ford Ranger How we'd spend $15,000 on eBay Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

5 stars in Euro NCAP crash tests for 5 new cars available in U.S.

Seven new cars have received a full five-star rating in the latest Euro NCAP crash tests. Of these, five are available in the United States: the Audi E-Tron, Lexus UX, Toyota Corolla, RAV4 and Mazda3. The Renault Clio and the Volkswagen T-Cross also took part, also receiving five stars. The Mazda3 hatchback was the fourth car in Euro NCAP history to reach an adult occupant protection score of 98%, after the Volvo V40 and XC60 and the Alfa Romeo Giulia. No NHTSA ratings for the Mazda3 or the Audi are yet available, but the Lexus and the Toyotas have all received five-star NHTSA safety ratings as well. Those three were tested as hybrid variants by Euro NCAP. Audi's first fully electric vehicle, the E-Tron, scored 91% in Euro NCAP's adult occupant rating, with unavailable knee airbags bringing down the score. The Mazda and the Toyotas offer them for the driver only, and the Lexus has the passenger's knees covered as well. The Lexus UX managed a 96% adult occupant score, close to the Mazda, and it provided better pedestrian safety (82%) than the Audi (71%), despite neither, or none, of the test vehicles having an active hood to catch pedestrians. As for the Toyotas, the Corolla, tested in both sedan and hatchback guises, scored 95% for adult occupant safety, with the RAV4 a couple notches down at 93%. Still, the five-star rating means all these vehicles are a very safe choice in their respective classes. Michiel van Ratingen, secretary general of Euro NCAP, states how important it is that even family hatchbacks perform well and have the latest safety tech available. "It is encouraging to see that all manufacturers did well, regardless of type of powertrain or class of vehicle tested," said van Ratingen. "New cars on the market continue to offer more advanced technology as standard, systems that were not even considered an option a few years ago." More crash test videos are available on Euro NCAP's YouTube channel. Audi Lexus Mazda Toyota Car Buying Safety audi etron lexus ux