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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.

8 cars we're most looking forward to driving in 2015

Now that 2014 is officially in the books, it's time to look ahead. And following our list of the cars we liked best last year, we're now setting our sights at the hot new metal that's coming our way in 2015. Some of these, we've already seen. And some are still set to debut during the 2015 auto show season. But these are the machines that keep us going – the things on the horizon that we're particularly stoked to drive, and drive hard. Jeep Renegade Not the Chevrolet Corvette Z06. Not the Ford Mustang GT350. Not the new John Cooper Works Mini. Nope, I'm looking forward to the adorable, trail-rated Jeep Renegade. And that's because I really, really, really like our long-term Jeep Cherokee Trailhawk. I do not, however, care too much for the Cherokee's looks, and I really don't like its $38,059 price tag. The Renegade Trailhawk, meanwhile, promises much of the same rough-and-tumble character as its big brother, but at what we expect will be a more reasonable price (I'm personally wagering on the baby Jeep's off-road model starting at no more than $23,000). With a 2.4-liter four-cylinder and a nine-speed automatic, it should also be a bit easier to fill than the V6-powered Cherokee. Also, I can't help but love the way the Renegade looks. It's like someone took a Wrangler, squished it by 50 percent and then handed it off to George Clinton for a healthy dose of funk. The interior, with its bright, expressive trims and color schemes should also be a really nice place to spend some time. I'll be attending the Renegade's launch later this month, so I'll have a much shorter wait than my colleagues. Here's hoping the baby Jeep lives up to my expectations. – Brandon Turkus Associate Editor Mazda MX-5 Miata Here's an uncomfortable truth: I'd rather spend a day driving a properly sorted Mazda MX-5 Miata of any generation on a winding road than I would nearly any other vehicle, regardless of power, price or prestige. It's not just that I prize top-down driving and enjoy the Miata's small size because it gives me more road to play with. I just find there's more motoring joy to be had with high-fidelity handling and an uncorrupted car-to-driver communication loop than I do with face-distorting power or grip – let alone valet-stand gravitas. But perhaps most of all, I love Miatas because they can deliver that level of feedback and driver reward at modest speeds that won't put the locals on edge or endanger lives – you can use more of the car more of the time.

Mazda won't build new Mazdaspeed3 or 6 based on current models

It's sad news but not entirely unexpected: According to a Motoring interview, Mazda doesn't intend to build high-performance versions of the latest Mazda3 and Mazda6. Instead, it will wait for the next generations of those cars to arrive before applying the Mazdaspeed treatment. When the future performance models do eventually arrive, expect them to take a step upmarket compared to the last ones. In the meantime, the Japanese brand will focus its engineering resources on the next-generation Skyactiv engine family, according to Mazda's North American operations president and CEO Masahiro Moro. "Our research and development department is 100 percent focused on delivering Skyactiv generation two and if we don't have this we don't have any other derivatives," Moro told Motoring. Once the new engines arrive around 2017, Mazda's engineers can start to develop performance versions. "MPS or performance model or a sort of iconic model of the future will be a little bit later at this stage," Moro said. Moro is already thinking about the direction for the future performance vehicles. He calls the previous Mazdaspeed3 "childish" and thinks it's time to go a different way. "Mazda brand has become more mature, more upscale, more sophisticated, and we have a new transition of the brand to relate that direction," he said. Rumors last year suggested that Mazda might introduce a new Mazdaspeed3 (speculative rendering above) as a concept at the 2015 Frankfurt Motor Show. It would have reportedly used the CX-9's 2.5-liter turbocharged four-cylinder tuned to 295 horsepower and an all-wheel-drive powertrain. The vehicle never appeared, though. The current Mazda3 and Mazda6 arrived in 2014, so a new generation of each wouldn't arrive until around 2020. That would put Mazdaspeed derivatives at 2021 or later. In short, it will be a while. For customers that have the Driving Matters attitude now, Mazda still offers the award-winning MX-5 Miata as a convertible and soon with an impressive folding hardtop. Plus, Fiat will sell its own versions of the car with 160 hp. We wouldn't mind if Mazda turned up the heat a little by introducing something like the Racing concept from last year's Tokyo Auto Salon, though. Related Video: