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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.

Buy a Fiat 124 Spider Abarth, get a free day of driving school

We know the Mazda MX-5 Miata and the Fiat 124 Spider are basically the same car underneath. As we pointed out in our first drive of the 124 Spider, the two cater to different drivers, so it can be tough to choose a favorite. FCA has made deciding between the two sports cars a little harder, as it will offer Abarth owners a free day of high-performance driving instruction with their cars. Anyone buying or leasing a new Fiat 124 Spider Abarth or a Fiat 500 Abarth will get a free, one-day class at the Bob Bondurant School of High Performance Driving in Phoenix. Bundling driving school with brand-new performance cars isn't unheard of – Dodge and Bondurant recently announced a similar program for the Viper – but it is quite rare for vehicles priced below $30,000. The free session will include instructor-led skid, autocross, slalom, and team rally cross activities, in addition to hot laps. While the one-day course is included for free, travel, food, and hotel expenses aren't covered. Fiat-less people can also join in on the fun buy purchasing the Abarth experience separately. Bondurant one-day classes cost at least a grand, which makes the Fiat price of $0 a good deal as long as you can get yourself there relatively cheaply. But is this enough for drivers to choose the 124 Spider Abarth over an MX-5 Club? This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Related Video: Featured Gallery Bob Bondurant Fiat 124 Spider Abarth Related Gallery 2017 Fiat 124 Spider: First Drive View 30 Photos News Source: FCAImage Credit: FCA Fiat Mazda Convertible Performance fiat 124 spider abarth

Our Mazda MX-5 Miata has the best engine bay in the business

One of the things that's really disappointing about modern cars is how they all hide their technology under a proverbial bushel. You pop the hood, and nine times out of 10, you're faced with some amount of black plastic hiding the functional bits. On some cars the plastic covers the bare minimum to have a "presentable" engine. Others have every tank, hose, wire and screw buried under a layer of smooth plastic. Few exemplify this practice better than engine bay of the current Lexus LS 460, seen below. If Lexus was this embarrassed about its engine, maybe it should have simply bolted the hood shut. However, like with weight gain and power creep, our fourth-generation Mazda MX-5 Miata bucks the plastic trend. Lift the aluminum hood of the little roadster, and you travel back in time more than a decade. (See the gallery up top.) Only one bit of decorative plastic is in sight, and it proclaims the car's Skyactiv technology and hides some of the wires leading to the ignition coils. Otherwise, nothing else is obscured. The shock tower braces, manifolds, battery terminals, the whole shebang is all right there for you to see. What's particularly amazing is that it all looks good. Even in some cars that eschew plastic covers, it's no guarantee of an attractive engine bay. We just had a new Honda Civic Sport hatchback (seen immediately above), and while it doesn't sport a plastic engine cover, you can see from the photo that it's not particularly attractive with tubes and cables snaking every which way. But in the Miata, the hoses and wires are kept to a minimum, and the ones that are there are arranged in a way that isn't haphazard or tangled. Then, in the middle, there's the clean, simple aluminum cam cover as the gleaming centerpiece, similar to those of the first- and second-generation cars. As the owner of a '99 Miata, this detail in particular gives me the warm fuzzies. The fully exposed engine bay fits with the Miata's personality. The car is very straightforward, it features just the absolute minimum of style and comfort additions, and is highly accessible. I would say the Miata's engine bay is the window to its soul, if driving it didn't offer a clearer picture. Related Video: