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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 zooms into SEMA 2016 with lighter MX-5 Speedster and RF Kuro concepts

It's almost time for the 2016 SEMA aftermarket show again, if you haven't guessed already by the steady parade of early looks at various show cars. Mazda's MX-5 creations are generally a highlight for us, unapologetic Miata junkies that we are. This year's cars should be just as exciting as last year's, one being a revision of last year's Speedster concept and the other based on the brand new, sexy RF retractable targa top model. Both SEMA MX-5s were designed and built in-house at Mazda's Irvine design studio. This year's Speedster is somehow even lighter than before. Mazda carved 100 pounds out of it, making it a staggering 350 pounds less than a production soft top model. It's also been repainted in a color called "White Ether", which we're imagining looks something like the "Blue Ether" paintjob on last year's highly reflective Speedster minus the blue tint. Mazda will probably never sell a roofless Miata or anything this lightweight, but maybe it should. It looks like it'd be a blast to drive at a road course. And then there's the RF Kuro concept, the first RF-based SEMA show car, which is shown in the teaser above. It doesn't seem terribly extreme, to be honest. It's wearing a matte charcoal paint, which explains the "Kuro" moniker – kuro means "charcoal" in Japanese. A set of 17-inch RAYS forged wheels and MX-5 Cup suspension, and that's about it. Not to knock it; the RF is a sexy looking thing as it sits, and Cup suspension should make it handle even more like a go-kart. Of course, both concepts will be fully revealed at the show next month in Las Vegas. Stay tuned for a dose of concept Miata hotness.Related Video:

Range Rover Sport SVR, Mazda CX-3, this week's news | Autoblog Video Podcast #533

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Reese Counts. We'll talk about the latest news and discuss a couple of the cars we've had in the office, the Land Rover Range Rover Sport SVR and the Mazda CX-3. We also have a look behind the scenes of a video we shot in Iceland. And of course, we'll help choose a new vehicle for a listener in our "Spend My Money" segment. Autoblog Podcast #533 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown This week's news Land Rover Range Rover Sport SVR Mazda CX-3 Iceland behind-the-scenes look Spend my money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Podcasts Land Rover Mazda Crossover SUV mazda cx-3