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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.

2016 Mazda2 gets EPA-rated 43 mpg highway

To paraphrase the famous quote from astronaut Neil Armstrong, that's one small step for man and one giant leap for the Mazda2. The Environmental Protection Agency (EPA) has weighed in on the new Mazda2 version, and says it gets a fuel-economy rating of 33 miles per gallon city and 43 mpg highway with a six-speed automatic transmission. Stick-shift gas-mileage figures are 31 city and 42 highway, which are still substantially better than the 29/35 rating from the most recent iteration of the model. That's about a 15-percent jump in fuel economy, people. More importantly, the Mazda2 beats out competitors such as the Hyundai Accent, Kia Rio Eco and even the Honda Fit in terms of fuel efficiency, which is pretty good company. The Mazda2 boasts a 1.5-liter four-cylinder engine. But it is the upgrade to six-speed transmissions in both manual and automatic versions that seem to be making the biggest difference in the ratings. Mazda started unveiling details about the next-generation Mazda2 last year, and last fall began production of the model at Mazda's new factory in Salamanca, Mexico. At that time, the Japanese automaker had already sold more than 2.4 million Mazda2 vehicles since the model's introduction in 1996. Related Video: