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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 will have a new rotary concept at Tokyo show, trying to bring it to production

Despite ending production of the rotary engine in 2012, Mazda has repeatedly insisted that it's still working on rotary engine tech, and it has continued to tease a potential future rotary car with concepts, the latest of which was the RX-Vision. The company even continues to file patents on rotary tech. It seems the company is continuing this pattern, since the vice president for Mazda's European R&D center told Auto Express that it has another rotary concept ready for this October's Tokyo Motor Show. According to Auto Express, the car expands on the groundwork laid by the RX-Vision concept. In addition to revealing the existence of the concept, the executive also reiterated the fact that there's still a team in Mazda working on the rotary engine, and people are still trying to make a business case for a new rotary sports car. Auto Express expects a production car could come in 2020. The news outlet also asked if the hypothetical car would be hybridized, and the Mazda executive didn't give much of an answer beyond it being possible, though he would prefer a purely rotary-powered car. We at Autoblog think a hybrid rotary of some sort would make the most sense. It would make for an impressive halo vehicle that could be used to promote future Mazda hybrids. This would also help with the business case side of things. An electric motor, or motors, would be highly complementary to the rotary engine as well. Electric motors produce oodles of torque from down low, which rotaries don't, and the rotary engine's high-rpm horsepower would compensate for the electric motors when they've started running out of power. Not only that, but using a hybrid powertrain could help a thirsty rotary engine meet fuel economy and emissions requirements while still producing plenty of power. A hybrid system is also more possible now that Mazda is teamed up with hybrid expert Toyota. Related Video:

Oliver Jarvis in a Mazda takes pole in star-studded Rolex 24 at Daytona

DAYTONA BEACH, Fla. — Oliver Jarvis broke a 26-year-old record at Daytona International Speedway in putting the Mazda DPi from Team Joest on the pole for the Rolex 24 at Daytona. Jarvis went to the top of the scoring chart early in Thursday's qualifying session with a lap at 1 minute, 33.685 seconds. It broke the mark by two-tenths of a second set by P.J. Jones in 1993 in a GTP-class Toyota. The Englishman spoiled a strong run by Team Penske, which qualified second and third for the twice-round-the-clock endurance race that begins Saturday. Ricky Taylor earned the second spot in Penske's Acura ARX-05, while teammate Juan Pablo Montoya was third in his first time qualifying the sports car for the organization. Team Joest wound up first and fourth on the starting grid with Jonathan Bomarito putting its second car on the second row. Felipe Nasr had the fastest Cadillac DPi-V.R in fifth for Action Express Racing. Nasr is the reigning IMSA champion and led the way for four more Cadillacs in qualifying. Jordan Taylor was sixth for Wayne Taylor Racing, ahead of Juncos Racing's Agustin Canapino, then Tristan Vautier and Stephen Simpson for JDC-Miller Motorsports. James Allen in an Oreca 07 Gibson for DragonSpeed won the LMP2 pole. In the GT Le Mans class, Nick Tandy put a Porsche on the pole as four different manufacturers qualified in the first two rows. IMSA GTLM champion Jan Magnussen of Corvette Racing was second, Ryan Briscoe in a Ford GT for Chip Ganassi Racing was third and followed by Davide Rigon in Risi Competizione's Ferrari 488. Marcos Gomes gave Via Italia's Ferrari 488 the pole in the GT Daytona class. Related Video: