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Mazda3 Skyactiv-Hybrid and CNG Concept shown in Japan

Mazda has received a tremendous amount of public and industry praise in the last few years, following up the successful introduction of its Skyactiv technology (powertrain and otherwise), with strong products like CX-5, Mazda6 and most recently, the Mazda3. At the Tokyo Motor Show, Mazda has taken yet another step forward with Skyactiv and the 3, showing the compact (called "Axela" in Japan) with an all-new compressed natural gas engine in the Skyactiv-CNG Concept.
The end result of the Skyactiv-Hybrid is fuel consumption estimated at something like 74 miles per gallon.
Mazda thinks that CNG-powered vehicles are due for an uptick in demand, and the company believes this new powertrain will add valuable breadth to the Mazda3 range. The CNG Concept is actually a duel-fuel vehicle, capable of running on either natural gas or gasoline. In fact, we're told that the high compression ratio (14:1) inherent in Skyactiv-technology gasoline engines makes conversion to CNG particularly simple.

Mazda files patents for a sequential twin-turbo setup

Mazda has a history of interesting engine technologies, from yesterday's rotary engine to tomorrow's compression ignition engine, and new patents show it still may have some internal combustion tricks up its sleeve. The one on display in these patents isn't especially new in concept, though. A sequential twin-turbocharger setup is something Mazda itself used on the third-generation RX-7. But it's something we haven't seen much of lately. It looks like it could have some possible advantages over older sequential systems, and it has some potential advantages for enthusiasts. First a quick and dirty primer for what makes a sequential twin-turbo system distinct from other twin-turbo systems. In many twin-turbo engines, there are simply two turbos that work together as one bigger turbo. They're the same size, and they spool up at the same time. With a sequential setup, at low rpm, a smaller turbocharger is spooled up first at low-rpm for quicker throttle response, and as the rpm and exhaust pressure increases, a valve opens up that allows a larger turbocharger to also spool up and provide high-rpm boost. That's basically how the Mazda design shown above functions. A big flap blocks off the larger turbocharger exhaust inlet, channeling all the exhaust to the smaller turbo. When more exhaust is available at high rpm, it looks like that flap opens up to spool up the big turbo, too. What's interesting here is that the way the turbochargers are packaged takes up less space than past systems. It looks like both turbos are contained in one unit that shares the same exhaust outlet, meaning the exhaust manifold could be kept simple and compact. In fact, the piping for compressed intake air could also be shared, reducing the amount of piping, which would further decrease the amount of materials and possible failure points. There are a number advantages of making this system smaller. The potential applications of the system are much greater, since it could fit in smaller cars with smaller engine bays. Making the system smaller also means that there won't be as much weight, which is important from both fuel economy and performance standpoints. Finally, the smaller setup likely uses fewer materials, which could make the system cheaper and thus easier to offer on a wider range of vehicles, or at least more profitable for Mazda.

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.