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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.

Rumored Mazda CX-3 may not be for US

Mazda has used its Kodo design language to make some of the most attractive, affordable cars in the world right now, with the Mazda3, Mazda6 and CX-5 (pictured above), but it still lacks a crossover in the smaller class, which are becoming popular on the world market. It seems like a natural fit then, that the Japanese company would shrink its CUV design even smaller for a CX-3 to fill the gap. However, a rumor suggests that the compact might not make it to these shores.
The Mazda2-based crossover is due later this summer in Japan and is launching in Europe and emerging markets later, according to Automotive News citing a report in Japan's Nikkei newspaper. The little CUV would cost between 1.5 million yen and 2.0 million yen ($14,700-$19,500) in Japan and be available with diesel and petrol engine options. However, the report made no mention of selling it in North America. There is a glimmer of a chance for the CX-3 here. Mazda is upgrading its Mexican factory to 230,000 annual unit capacity by 2016, which gives it the room to add the new vehicle.
While the midsize CUVs are hugely popular in the US, compacts like the Buick Encore are still a small portion of things. If Mazda could time the CX-3's launch right here, it could take advantage of the lack of competition.

Mazda3 officially unveiled

Mazda has officially pulled the sheets off of its 2014 Mazda3. The all-new compact boasts a wheelbase that's a full 2.4 inches longer than the outgoing model, yet the hatchback is a nearly two inches shorter from stem to stern. The machine is also lower and wider than before, which should give occupants plenty of space indoors. The driver gets treated to a new human-machine interface that features a new Active Driving Display for information like vehicle speed and navigation instructions conveniently in the line of sight. Likewise, the vehicle's infotainment system has received a complete rebuild.
Outside, the new Mazda3 makes full use of the company's KODO design language, and to our eyes, the result is one of the most attractive entries in the segment. Jump under the hood, and buyers can expect to find a Skyactiv-G 2.0-liter gasoline engine with 155 horsepower and 150 pound-feet of torque, though no fuel economy estimates are available. For those looking for a bit more thrust, Mazda also offers a 2.5-liter Skyactiv-G gasoline mill with 184 hp and 185 lb-ft of torque. So far there's no word on the diesel engine available to our friends in Europe.
Both engines can be mated to either a six-speed manual or a six-speed automatic and feature the automaker's i-ELOOP brake energy regeneration systems. The recaptured energy is stored in a capacitor and used to power the vehicle's various electrical systems.