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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.

2023 Japan Mobility Show Editors' Picks

No, it's no longer called the Tokyo Motor Show, but the Japan Mobility Show is still in Tokyo and it still has to do with motors. In fact, with the rise of EVs, it's more of a motor show than ever before. And there were an astounding number of motors (and engines) to see, or at least concepts that hypothetically have them. Truly, we haven't seen a turnout this amazing since before the pandemic.  As such, the 2023 Japan Mobility Show featured plenty of machines that could, and did, snag points from our editors. And yet, even with the massive field, one car, unequivocally, stole our hearts. Read on to see our favorites.   Toyota Land Cruiser Se concept View 4 Photos 5. (Tie) Toyota Land Cruiser Se  While this concept is not quite the off-roader that the Land Cruiser is known to be, a street-focused electric SUV seems like a fine fit for the Toyota portfolio. It's hard to imagine we won't see an electric Land Cruiser come to production one day, filling out that as-yet underrepresented three-row EV segment. Give us an even more rugged version, and we'll be happy — Senior Editor, Green, John Beltz Snyder   Subaru Sport Mobility Concept View 7 Photos 5. (Tie) Subaru Sport Mobility I'm still waiting for a fun, electric sport coupe, and as much as I enjoy the likes of the rear-drive BRZ, I could have some serious fun in something like this all-wheel-drive Subaru Sport Mobility year round. I could fill that hole in my heart left by my '04 WRX. — Senior Editor, Green, John Beltz Snyder   Toyota EPU concept View 4 Photos 4. Toyota EPU You know what I like? Useful, funky little vehicles. The Ford Maverick and Hyundai Santa Cruz fit that bill well, and it seems a lot of other people like them, too, based on demand. You know what I also like? EVs. You know what combines those two things? The Toyota EPU. Assuming it was priced fairly reasonably (well below $40,000 is what I'm thinking), I would seriously be looking at getting one. I also seriously hope that Toyota's seriously looking at launching this, because it seems like a seriously great package. Seriously. — News Editor Joel Stocksdale   Mitsubishi D:X Concept View 8 Photos 3. Mitsubishi D:X Concept We sure do wish Mitsubishi sold the Delica here in the United States. We've long been fans of the van, which initially was sold in rear-wheel-drive form but adopted four-wheel drive in the early 1980s, and judging by the numbers we see imported to the States, we're not the only ones.

2019 Mazda3 Sedan Drivers' Notes Review | Moving on up

The Mazda3 enters its fourth iteration for 2019, replacing one of our favorite compacts on the market. As such, expectations were high for the new model. Like before, the Mazda3 is available as both a sedan and hatchback, though the big news for the new model is the available all-wheel drive system, a rarity for the class and and a feature more and more people are looking for in a car these days. At launch, power comes solely from a 2.5-liter naturally aspirated inline-four, though Mazda plans to offer additional powertrains down the line. Competitors include the Honda Civic, Toyota Corolla, Subaru Impreza, Hyundai Elantra and Kia Forte. Our tester was a well-equipped Mazda3 Premium front-wheel-drive sedan. Standard features include 18-inch wheels, LED lighting, a power driver's seat, leather seating and trim, keyless entry and ignition, dual-zone climate control, an 8.8-inch infotainment system, Bose audio, blind-spot monitoring, rear cross-traffic alert and adaptive cruise control. The only added cost to the Premium Package is $595 for the paint. All in, our tester came out to $27,990. Editor-in-Chief Greg Migliore: The Mazda3 is the sportiest in the segment and, as far as I'm concerned, it's dead-even with the Honda Civic for the top spot in the looks department. The steering, brakes and suspension all feel dialed-in and quick. Many compacts are sedate. The 3 makes you want to track it. The suspension is stiff enough that non-enthusiasts might prefer something else, though it's not abusive. The naturally aspirated four provides just enough getup. Mazda is good at the minimalistic approach. Tune a car well, make it look sporty, and don't try to overcompensate with horsepower. This thing looks great inside and out. For the price, you can't beat it. The cabin has the appearance and feel of a premium sedan, with pleasing materials and an enveloping cockpit. With a creased hood and huge, blacked-out grille, the 3's front end has a contemporary style with old-school panache. I might like the hatch better because it's a rarer body style. Still, this sedan is a well-rounded, sporty execution and a great value. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Associate Editor Joel Stocksdale: Since its reveal at the Los Angeles Auto Show, the 2019 Mazda3 has been my most anticipated car of the year, as well as the one I've been most worried about.