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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.

Will the Mazda2 be offered as a PHEV with a rotary engine range extender?

Every few months, it seems a rumor crops up about plans from Mazda to revive the rotary engine. Last November, its CEO said the only way another one could happen is if the project was profitable, and then a month later the automaker showed off the Mazda2 RE Range Extender with a 330cc Wankel engine mounted in the rear. Now, Australian auto site Motoring reports that the PHEV may actually make production in the next-gen Mazda2 sometime after it's initial launch.
Martin Benders, managing director of Mazda in Australia, spoke to Motoring about the company's future with hybrids and basically reiterated what the CEO said last year. The Japanese automaker only plans to offer electrified powertrains in places where they can sell in sufficient numbers to be profitable, like Japan.
Mazda has been playing with the rotary range-extender idea for years. In the RE prototype, the engine was exclusively used to charge the lithium-ion batteries when they were running low, and a 100-horsepower electric motor provided all of the propulsion. It gave the little hatch an estimated range of about 250 miles. The company reportedly took inspiration from its Skyactiv engines to make the Wankel have lower friction and a lighter weight.

2019 Mazda CX-5 to get 2.5-liter turbo and revised G-Vectoring

The 2019 Mazda CX-5 is getting Mazda's 2.5-liter turbocharged four-cylinder engine if this supposed internal document from Reddit is correct. The user claims a salesperson showed him the document in question. In addition to the availability of the turbo engine, Apple CarPlay and Android Auto appear to be added onto every trim level. Do take note that the document says it's from Mazda Canada at the bottom, so that's why the trim levels don't have the same names as they do in the U.S. Another interesting mention in there is G-Vectoring Control Plus. We've had Mazda's G-Vectoring Control technology for a little while, but never has a car come out with the Plus moniker on there. Our best bet is Mazda has revised its original G-Vectoring system for 2019; we'll have to wait for official information to see what exactly changed though. At the top of the page Mazda lists "substantial visual changes to the interior" as one of the highlights. The biggest change we can find related to that is a seven-inch LCD display added to the gauge cluster on what would equate to the Grand Touring trim in the U.S. At least Canada — and maybe we too — seems to be getting a fourth trim level called "Signature." This will probably consist of more expensive materials used throughout and maybe a few bonus tech features over the Grand Touring. The page shared looks plenty legitimate, but it's still best to maintain some healthy skepticism. It's also from Canada, so there could be some slight variations between how those cars are equipped versus those coming stateside. We're excited to see the 2.5-liter turbo in the smaller CX-5, though. It should give that car the extra punch it needs to fend off faster rivals in the ever-expanding crossover segment. Featured video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.