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Nissan recalls 226k vehicles over airbag inflators

Nissan and Infiniti are the latest automakers to issue recalls involving faulty airbag inflators from Takata. The Japanese automakers have announced campaigns covering about 226,326 units from seven models built in the early 2000s because they contain the bad part in the passenger-side, front airbag. The affected vehicles include the 2002-2004 Nissan Sentra, 2002-2003 Pathfinder and 2002-2003 Maxima, and it also covers the 2002-2003 Infiniti QX4, 2002-2003 I35, 2003 FX45 and 2003 FX35.
Like the other vehicles with the faulty inflators, it's possible for the part to rupture during airbag deployment and spray metal shrapnel at occupants. Nissan and Infiniti have even included vehicles with replacement airbags in this campaign because those parts also could have been defective. Both companies were also part of the earlier regional campaign to fix cars in high-humidity climates where the problem has been found to be the worst.
As is the usual response, Nissan and Infiniti will notify owners of the affected vehicles and will make the repair at no charge. According to the filing with the National Highway Traffic Safety Administration, these fixes will commence around August 11. Scroll down to read the report from NHTSA, or read the full defect notice as a PDF, here.

Infiniti SUV recall marks latest chapter in Takata airbag saga

Automotive parts maker Takata is having a rough year with millions of vehicles equipped with its airbag inflators being recalled. However, it looks like there might still be problems with the company's quality control, if a new recall by Infiniti is any indication.
The Japanese luxury brand is recalling 1,912 total units of the 2013 Infiniti QX56 and 2014 QX80 in North America because of a manufacturing flaw with their Takata-supplied inflators for the driver's side front airbag. Of those, 1,848 are in the United States, according to the National Highway Traffic Safety Administration. Specifically, the outer baffle could be the wrong component and cause too much pressure to build up inside. According to documents submitted to NHTSA, it's possible in a crash for the part to rupture spraying metal shrapnel at occupants. At this time, Infiniti has not had any reports of this actually happening to drivers.
While this problem sounds nearly identical to the issue affecting millions of earlier vehicles, it must be noted that this is a different fault. According to the notice being sent to dealers on NHTSA's website: "This particular Voluntary Safety Recall Campaign is unrelated to two earlier campaigns that involved Takata passenger front air bag inflators on some older model Infiniti vehicles. This issue involves a much newer inflator and is a different, more isolated, Takata quality control issue."

Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.