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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.

The Mazda MX-5 Miata is truly a four-season sports car

For all intents and purposes, the Mazda MX-5 Miata is a product of California. I know it says Hiroshima on the shipping container, but the car belongs to the Golden State as it was dreamt up in Irvine and honed its driving skills on the roads near Santa Barbara. And logic would dictate the Miata would be useless in any situation other than direct sunlight. That's what drivers from other states would think, anyway. It's the time of year when those of us from the west coast fly out to places where it's snowy and icy and everyone laughs at us because the cold and white stuff essentially shuts us down. Make fun of Californians driving in the rain or freaking out when the outside temperature dips below 55 degrees. What can we say, we're just out of our element. Perhaps, then, it's surprising the Miata handles snow a lot better than I do. I found this out when Mazda sent me to Crested Butte, CO, for a little fun on a frozen track. Yes, there was a lot of sideways action, but it had more to do with the two California residents inside than with the car. The company really invited journalists to Colorado to get an idea of how its all-wheel-drive crossovers perform when things get snowy and icy. But the real show was watching how we navigated the autocross course they set up for the rear-drive Miatas that Mazda brought along. The Miata had a good heater, but it was my laughter caused by immense admiration that kept me from freezing my fingers off. Armed with a set of Bridgestone Blizzak winter tires, the Miata performs just about how you'd expect it to – if you're light on the gas and quick with the steering and have a good amount of patience in you. It all works well if you're a pro driver, less so if you're not a frequent track visitor, regardless of the weather. But fortunately we were using the fourth-generation Miata, which has to be the most forgiving sports car ever. On pavement, it behaves like a compact hatchback. Put it in sixth and it's relaxed and compliant, with a ride that doesn't beat you up and an engine that knows when you just want to get where you need to go. Provoke it, however, and it rewards you with predictable responses from the controls. It does the same thing on ice, if you have a firm grasp on how a car responds to the frozen stuff. Starts are tricky, even in second gear, if you underestimate the power from the 2.0-liter four.

6 best cars for $5,000

Looking for a great used car but only have a few thousand bucks to spend? Check out our 6 favorite used vehicles that you can get for around $5,000 or less. 1. 2004-2006 Subaru WRX The Subaru Impreza WRX offers a lot of what you might want in a vehicle. A 2L turbocharged engine gives 227 horsepower and it gets 27 mpg on the highway. 2. 2006-2015 Mazda5 The Mazda5 never got the sales it deserved. It was affordable and more maneuverable than most vehicles, but it never took off. It was based on the Mazda3, and felt like it as well... just a bigger version. If you're lucky, you'll be able to locate one with a manual transmission. 3. 1990-1997 Mazda MX-5 Miata A car that's praised for rewarding the driver. The shifter is sublime, and the controls are light and accurate. The 1.6-liter engine that makes 115 horsepower or a 1.8-liter that makes 128 horsepower are our preferred versions. 4. 2009-2013 Honda Fit Beside being cute, it's supremely practical and great in the city. It manages to be pretty entertaining to drive, and let's not forget it's a hatchback. 5. 1987-2006 Jeep Wrangler Yes, it's possible to get a well-loved Jeep Wrangler with about 100,000 miles on the odometer. In many ways, a Wrangler is perfect for the snowy winters with its unrivaled 4x4 capability. An SUV, convertible and icon, all in one? What more could you ask for? 6. 2002 Chevy Silverado Truck lovers, we have you covered. We love the Chevy Silverado with a 5.3-liter V8 engine and a 4-speed automatic transmission. It makes a great second car, especially if you already have a fuel efficient vehicle around the house. What would you buy for $5,000? Honda Jeep Mazda Subaru Autoblog Minute Videos Original Video wrangler mazda5