2001 Nissan Maxima Se on 2040-cars

Auto blog

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.

Nissan settles with FTC over misleading dune buggy ad [w/videos]

A couple years ago, Nissan created a series of commercials for its compact Frontier pickup showing the truck performing outlandish stunts such as snowboarding, saving a passenger airplane from a crash landing and climbing a steep sand dune to help a stranded dune buggy. As crazy as the first two commercials were, the Federal Trade Commission (FTC) took issue with the latter, titled Hill Climb, with the agency considering it to be a misleading commercial since both vehicles required a cable to reach the top of the steep dune.
As such, Ad Age is reporting that Nissan - and its ad agency TBWA Worldwide - has settled with the FTC over the ad despite the fact that it features a disclaimer stating: "Fictionalization. Do not attempt." Nissan did not have to pay out any money in the settlement, but it is prohibited "from using potentially misleading demonstrations in future advertisements for pickups." In addition to the offending commercial, posted below, we've included some of the other related videos from the same Frontier campaign.

Nissan recalling 2012-14 Frontier pickups over fire risk

Nissan is recalling its Frontier pickup over fire concerns, according to a National Highway Traffic Safety Administration bulletin. A total of 13,535 vehicles are being recalled, all from the 2012 to 2014 model years, built between November 28, 2012 and December 27, 2013.
The NHTSA report states that "in the affected vehicles, a circuit breaker may have been installed incorrectly causing the main wire harness connected to the circuit breaker to face outward, potentially contacting a metal bolt located on the A-pillar." If this happens, it's possible that "the bolt may wear though the wire harness covering, resulting in an electrical short," NHTSA states. In the event of an electric short, a fire may occur.
The official recall will begin in March, where Nissan dealers will inspect the circuit breaker for the correct orientation, and if necessary, repair the vehicles, free of charge. Scroll down for the full NHTSA bulletin.