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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.

2017 Fiat 124 Spider priced below most Miatas

The Fiat 124 Spider and Mazda MX-5 Miata might be siblings, but all that means is the rivalry between the two cars will be unusually intense. Pricing for the reborn 124 has been released and is added proof of that fact – aside from the very base trim, the turbocharged Italian is cheaper than its Zoom-Zoomy brother. Fiat's base model, the 124 Spider Classica, starts at $25,990. The MX-5 Sport isn't much cheaper, at $25,735. Both cars get 16-inch alloy wheels, black cloth seats, LED taillights, but the Mazda will throw in LED headlights. It's also interesting to note that the two cars have differing destination charges – $995 for the Fiat and $820 for the Mazda. Move up to the mid-range Fiat, and you'll start to see the "Italian" car eke out a pricing advantage. The Lusso, Italian for luxury, rings up at $28,490 compared to the MX-5 Grand Touring's $30,885. Yes, we're comparing the middle-tier 124 to the range-topping Mazda, because the mid-range, enthusiast-oriented Club is more analogous to the 124's Abarth model. The Lusso matches the MX-5 GT with 17-inch alloys, heated leather seats, a 7.0-inch touchscreen with navigation, and dual-zone automatic climate control. The Mazda does come with a bevy of safety features as standard – blind-spot monitoring, lane-departure warning, and automatic high-beam control – which look to be optional on the Fiat, so take that into consideration if you're thinking about buying one of the two. We enthusiasts are most interested in the matchup between the 124 Spider Abarth and the MX-5 Club. The scorpion-badged 124 starts at $29,190 and the Club at $29,420. You'll get more power – 10 additional ponies according to FCA – as well as all the performance goodies from the Club. There are Bilstein-tuned shocks, a mechanical limited-slip diff, and a front strut bar, plus a very imposing exhaust note. Recaro seats will be an optional extra, as will Brembo brakes (the MX-5 bundles them with BBS wheels). Finally, there's the 124 Spider Prima Edizione Lusso. The limited-edition wears Azzurro Italia (translation: pretty blue) paint and rings in at $35,995, which gets you a bunch of swag on top of the normal Lusso stuff. Oh, and if you choose the automatic transmission, you'll be punished with a $1,350 charge, regardless of which Fiata you go for. That's less than the premium Mazda charges for an automatic on an MX-5 Club or GT, but more than the $1,480 extra it charges for a two-pedal Sport.

Mazda recalling 18k Mazda6 and RX-8 models over airbag inflators

Faulty Takata airbag inflators keep taking their toll on automakers. Mazda is the latest to be affected in the US by announcing a recall covering 18,050 Mazda6 and RX-8 models to replace the front, passenger-side airbags. Specifically, the campaign covers 18,000 Mazda6 units from the 2003 and 2004 model years built between May 29, 2002, and March 4, 2004, and 50 RX-8 vehicles from the 2004 model year made between June 25, 2003, and June 30, 2003.
As with the rest of the vehicles with these faulty inflators, it's possible for the part to rupture when deploying the airbag and potentially spray shrapnel at the occupant. Mazda's defect notice goes into a bit more detail than most about the problem saying: "some propellant wafers have been produced with an inadequate compaction force, or may have been exposed to uncontrolled moisture conditions (those wafers could have absorbed moisture beyond the allowable limits)."
This isn't Mazda's first difficulty with Takata-supplied airbags this year. The company was among the seven automakers that recalled vehicles in hot-weather states over the inflators. It also had to recently fix 42,000 Mazda6 vehicles in China over the issue.