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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 Hazumi concept gets punchy, comes out of its corner early

The official images Mazda Hazumi concept, which previews the next-generation Mazda2, have leaked out from Chinese website Auto.sohu.com ahead of its debut at the 2014 Geneva Motor Show.
The subcompact, four-door hatchback shows off Mazda's Kodo design language in its smallest size yet. Hazumi means "bound" or "spring up" in Japanese, and it is meant to look like it is packed with energy. It is a very attractive little concept and hopefully points to a more stylish face for the next-generation Mazda2.
Mazda has not unveiled the full details about the concept yet, but in a previous release, it said for the car is using a 1.5-liter Skyactiv-D diesel engine. While Mazda has not officially said that the Hazumi shows the next Mazda2, it did say in its earlier release that it "points the way to the future" for the brand's small cars. Reading between the lines isn't too difficult, then.

The Mazda MX-5 Miata RF's trick roof will cost you at least $2,555 extra

Now that loyal customers have been given the opportunity to preorder the Mazda MX-5 Miata RF Launch Edition, Mazda has finally announced pricing for the regular 2017 MX-5 RF lineup. The vehicle, with its gorgeous power retractable hardtop, will come in two trims – the MX-5 RF Club and Grand Touring when the vehicle goes on sale early next year. The MX-5 RF Club with the manual transmission is priced at $32,390, including $835 destination, which represents an additional $2,955 over a six-speed manual MX-5 Club with a soft top. An automatic is a $730 option for both RF and soft top Club models. The range-topping MX-5 RF Grand Touring trim will start at $33,455 with a six-speed manual transmission, which is $1,170 less than the Launch Edition's price tag of $34,685 and $2,555 more than a soft-top model. Opting for the automatic transmission on the Grand Touring trim bumps the price tag up to $34,660. The MX-5 RF models are similarly equipped to the soft-top models. The Club models benefit from cloth seats with red stitching, a limited-slip differential (when equipped with a manual transmission), suspension from Bilstein, and an optional Brembo brake and BBS wheel package for an extra $3,400. The more luxurious Grand Touring models get adaptive headlights, heated leather seats, and lane departure warning. The MX-5 RF models, just like the regular soft-top models, don't have many options. Hands-free keyless entry is a $130 option, while premium paint options, which includes Machine Gray Metallic (the same color on the Launch Edition) and Soul Red Metallic both cost $300. Crystal White Pearl Mica is only available on Grand Touring models and will cost an additional $200. Unlike the Launch Edition that was limited to only 1,000 units, there's no production limit on the regular MX-5 RF. Mazda will being delivering the MX-5 RF Launch Edition in February of 2017, with the standard MX-5 RF models following shortly after. Related Video: Featured Gallery 2017 Mazda MX-5 Miata RF View 15 Photos News Source: MazdaImage Credit: Mazda Mazda Convertible Lightweight Vehicles Performance pricing mazda mx-5 rf