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Feds investigating 2010-11 Mazda CX-9 CUVs over braking issues

The National Highway Traffic Safety Administration is investigating 62,000, 2010-2011 Mazda CX-9 models over brake problems. The government safety watchdog says it has received seven complaints of an observed loss of power braking power to stop the crossover, according to the The Detroit News.
The NHTSA complaints say that the problem causes a hard pedal, increased braking effort and reduced braking effectiveness. Some complaints allege that they hear a hissing noise during braking similar to the sound of air leaving the tires. No injuries or crashes have been reported.
"As always, we are fully cooperating with NHTSA on their investigation. We cannot comment further at this time," said Mazda spokesperson Tamara Mlynarczyk to The Detroit News.

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.

6 best cars for $5,000

Looking for a great used car but only have a few thousand bucks to spend? Check out our 6 favorite used vehicles that you can get for around $5,000 or less. 1. 2004-2006 Subaru WRX The Subaru Impreza WRX offers a lot of what you might want in a vehicle. A 2L turbocharged engine gives 227 horsepower and it gets 27 mpg on the highway. 2. 2006-2015 Mazda5 The Mazda5 never got the sales it deserved. It was affordable and more maneuverable than most vehicles, but it never took off. It was based on the Mazda3, and felt like it as well... just a bigger version. If you're lucky, you'll be able to locate one with a manual transmission. 3. 1990-1997 Mazda MX-5 Miata A car that's praised for rewarding the driver. The shifter is sublime, and the controls are light and accurate. The 1.6-liter engine that makes 115 horsepower or a 1.8-liter that makes 128 horsepower are our preferred versions. 4. 2009-2013 Honda Fit Beside being cute, it's supremely practical and great in the city. It manages to be pretty entertaining to drive, and let's not forget it's a hatchback. 5. 1987-2006 Jeep Wrangler Yes, it's possible to get a well-loved Jeep Wrangler with about 100,000 miles on the odometer. In many ways, a Wrangler is perfect for the snowy winters with its unrivaled 4x4 capability. An SUV, convertible and icon, all in one? What more could you ask for? 6. 2002 Chevy Silverado Truck lovers, we have you covered. We love the Chevy Silverado with a 5.3-liter V8 engine and a 4-speed automatic transmission. It makes a great second car, especially if you already have a fuel efficient vehicle around the house. What would you buy for $5,000? Honda Jeep Mazda Subaru Autoblog Minute Videos Original Video wrangler mazda5