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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 RT24-P brings KODO style to the Rolex 24 at Daytona

In addition to its new CX-5 crossover, Mazda revealed its new racecar, the RT24-P, at the Los Angeles Auto Show. The car has been designed for the Daytona Prototype international (DPi) class in IMSA's WeatherTech SportsCar Championship and will make its racing debut at the Rolex 24 at Daytona. It was designed using Mazda's KODO design language, which the brand has so successfully applied to its road-going cars. The racer's relation to Mazda's production cars is made obvious by the small five-point grille at the tip of the RT24-P's nose. While plenty of credit needs to go to the stylists and aerodynamicists at Mazda and Multimatic, one of the companies Mazda partnered with on the car, some of the credit needs to go to IMSA's new DPi rules for 2017. The new DPi class is very similar to the LMP2 class that it competes with in the WeatherTech series, with some noteworthy differences. The DPi class allows manufacturers to create unique bodies and engine packages for one of the four chassis available. The LMP2 class requires competitors to use the chassis companies' bodies, and are restricted to one engine package. View 14 Photos As for the powertrain, the Mazda RT24-P uses a turbocharged 2.0-liter four-cylinder that puts out roughly 600 horsepower. Mazda used the same engine in its P2-class race car last season. Mazda's body and engine will ride atop a chassis developed by Riley Technologies and Multimatic. You may remember that latter company as the one that developed the awesome spool valve shocks on the Chevrolet Colorado ZR2. The RT24-P will be campaigned by Speedsource, a company that has been racing Mazdas in American endurance racing for years, including last year's P2 cars. Considering Mazda's success in making such a cool race car, we're excited to see what other manufacturers do with the extra design freedom of the DPi class. Both Chevrolet and Ford competed last year in the WeatherTech prototype class with Daytona Prototype-style cars, and Honda competed with an LMP-style racer. Depending on what other makes decide, this year's WeatherTech line-up could have some nifty designs. Related Video: Related Gallery 2017 Mazda RT24-P race car View 9 Photos News Source: Mazda, IMSAImage Credit: Live photos copyright 2016 Drew Phillips / Autoblog Motorsports LA Auto Show Mazda Racing Vehicles Videos Original Video 2016 LA Auto Show

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.