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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.

Mazda's slick new CX-4 crossover is sadly only for China

Mazda just unveiled the CX-4 crossover at the Beijing Motor Show, introducing the sleek new crossover exclusively for the Chinese market. The CX-4 rides on the same wheelbase as the CX-5, and is just as wide. It even packs the same powertrain options: 2.0- or 2.5-liter inline fours from Mazda's Skyactiv-G series, mated to the same six-speed manual or automatic transmissions. It measures a little longer from bow to stern than the CX-5 (albeit shorter than the CX-7), but the key part here is that it's shorter in height – shorter even than the smaller CX-3 – thanks to its sleek coupe-like roofline. The resulting impediment to interior space may make little sense from a practical standpoint, but it sure does make it look good. Consider the CX-4, then, to bear a similar relationship to the CX-5 as the BMW X4 does to the X3, or the Coupe versions of the Mercedes GLC and GLE to their conventional counterparts – albeit with styling more similar to the Infiniti QX70, particularly at the back. The question is whether the US market is ready for a more budget-oriented five-door crossover coupe in the same way that it has embraced those more upscale offerings. Mazda doesn't seem to think so; at least not for the time being. For our part, looking at the CX-4, we're not so sure. What do you think? Related Video: Mazda Unleashes New Mazda CX-4 Crossover SUV - On display now at the Beijing Motor Show, sales in China start in June - HIROSHIMA, Japan—Mazda Motor Corporation has unveiled a new crossover SUV, the Mazda CX-4, at the Beijing Motor Show (Auto China 2016).*1 The latest edition to Mazda's new-generation lineup adopts SKYACTIV TECHNOLOGY and KODO—Soul of Motion design throughout and goes on sale in China in June. The CX-4 was made to exceed existing categories and stereotypes. The dynamic design is unmistakably KODO in form and the planted stance and sleek, coupe-like cabin combine to give the model an outstanding presence. Customers will appreciate the exceptional functionality and user-friendliness, including the ease of entering and exiting the vehicle and the flexible cargo space. With SUV-like ground clearance and Mazda's i-ACTIV AWD*2 all-wheel drive system, the CX-4 is ready to take on a wide range of road conditions and offers a combination of outstanding environmental and safety performance (Sustainable Zoom-Zoom) and a Jinba-ittai driving feel with excellent handling thanks to its low center of gravity.

Mazda Furai concept designer talks about his car's passing

Last week, there was mourning at the Autoblog offices as word trickled in that the Mazda Furai concept - one of the coolest, best-looking showcars to grace an auto show stage since the wild and crazy 1960s -had been killed. It was killed on the track with the folks from Top Gear in attendance. We're sure the gods of driving would have wanted it to die on a circuit, but that doesn't make its fiery passing any easier to deal with.
The Furai is the rare concept car that had a lasting appeal with enthusiasts, partly because it was a real, functioning racecar, complete with a wacky three-rotor Wankel engine and cutting-edge Nagare design. Now that it's gone, though, Road & Track's Mallory McMorrow, who was an intern at Mazda Design when the Furai was being styled in 2007, has published an interview with one of the men who penned the Mazda showcar's striking exterior, Carlos Salaff. It's a great piece on the emotional connection between a designer and his creation, and one you should take the time to read. Click on over to R&T for the full story.