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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.

Car Club USA: Miatas at Mazda Raceway Laguna Seca

The Mazda MX-5 Miata is a very popular car for weekend warriors looking for the thrill of automotive racing in an affordable package. These iconic, rear-wheel-drive roadsters are lauded by enthusiasts for their driving dynamics, reasonable price, and plethora of available parts. That's why the annual Miatas at Mazda Raceway Laguna Seca track event draws such a diverse cross section of drivers from allover the country. But, still, some types of drivers are more well-represented than others. "I usually am the only female signed up for the high-performance driving," said Carolyn Kulaja of Gila Monster Racing. "The car doesn't care the gender of the person driving." For Carolyn, racing Miatas is a passion that developed later in life, but she's not slowing down anytime soon. "My first racecar was car number 57, which was my age when I started racing," said Carolyn. "The 88 I decided was going to be my age when I quit racing." Young competitor Kyle Koh of Infotech Motorsports has his own reasons for racing. "Driving has changed my life in a major way," said Kyle. "It took me out of a depression." Kyle's first competitive fire was directed toward football, but after breaking his back during his sophomore year of high school, he had to find another outlet. "Kyle came to me one day and he decided that he wanted a project car," explained Kyle's father and racing partner Larry Koh. "Because the Miata community is so friendly to begin with, it becomes a big family." How will Carolyn and Kyle fare through Laguna Seca's infamous corkscrew? Find out on this episode of Car Club USA. Each Car Club USA episode features a different car club or event from across the US, where passionate owner communities gather to share automotive experiences and embark on incredible adventures. From Main Street cruises to off-road trails, catch all the latest car club activity on Autoblog.

10 most memorable cars and SUVs of 2019

It's no surprise that a car reviewer will drive a large number of cars over the course of a year. Indeed, when the clock strikes midnight on Dec 31, I will have driven 75 new cars, trucks and SUV this year (and one old Peugeot) over the course of weekly evaluation loans and first drive events. That sure seems like a lot. Some definitely got more attention than others, and some came and went without leaving much of an impression – I completely forgot I drove a Kia Forte. Yet in the spirit of this day, I thought I'd pick the 10 that I would love to see under the Christmas tree tomorrow morning. You know, just in case you were looking to get me something. I'll also throw in a couple disappointments that were memorable for the wrong reasons. They'd get sent back to the store on Boxing Day. Lexus LC 500 Pictured below and resplendent in its Flare Yellow metallic paint, the car that would reach highest on my list is the divine Lexus LC 500. As a devout lover of GT cars, the LC ticks all the boxes. Muscular and characterful engine? V8, check. Beautifully made and memorable interior? It's gorgeous, to hell with Remote Touch. Check. Comfortable and reasonably practical? Superb seats and, uh, yeah. Makes me want to stand there and stare at it? You bet. Though I long figured my heart would say LC but my head "Porsche 911," after this go-around, that's no longer the case. LC, pretty please. 2020-lexus-lc500-f34-2 View 19 Photos Polestar 1 I actually feel lucky that I got to drive the Polestar 1. Only 150 will be produced each year, and it's a far more special thing than it would initially appear. And that's despite initially appearing to be a beautiful, classic two-door GT car with a roof so rakish it's only possible because it's made of carbon fiber. That itÂ’s a massively powerful plug-in hybrid with more all-electric range than any other PHEV is a thick dollop of whipped cream on a slice of Toscakaka. You know, Swedish dessert, Swedish car. Fine, I'll stick to Ikea references.  Polestar1_Launch_SanFrancisco-0014 View 44 Photos Volvo V60 Cross Country Speaking of Sweden, did I drive this car off the road there? Sure did! And despite this, the V60 Cross Country scratches that certain wagon itch and looks sensational to boot. I wish it were available with the T8 plug-in hybrid powertrain, but it's best not to get greedy at Christmas.