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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.

Infiniti G37 to live on in showrooms alongside 2014 Q50

Infiniti is preparing to roll out its hotly anticipated 2014 Q50, a car that not only ushers in a new alphanumeric naming strategy, it ostensibly replaces the G37 as the brand's bread-and-butter sport sedan. That will happen, but not in the short-term, as the G37 will continue to be manufactured and sold alongside the Q50, at least for the rest of this year.
Infiniti spokesman Kyle Bazemore has confirmed to Autoblog that a decision is pending on how long to extend the G37 sedan's production run. "We're taking Q50 up a little bit, and that allows us to keep the G Sedan in the lineup... It [Q50] certainly started as a replacement, but it ended up being much more than that." Confusingly, Infiniti has already announced that the Q50 is to start at $37,605 (including $905 destination charge), yet the 2013 G37 is more expensive, starting at $38,255 delivered according to Infiniti's consumer website. Thus, a price drop on the G37 is likely coming in short order.
So why hold on to the older model? With the Q50 launching exclusively with V6 and Hybrid models (a turbo four and diesel are said to be in the cards down the road), Infiniti evidently feels it is risking leaving lower-end sales on the table. "There's a lot of movement with the [BMW] 320i and such, and this allows us a two-tier strategy to compete," says Bazemore. Keeping the G37 on tap at a lower price for fleet sale duty may also serve to protect the Q50 as it establishes itself on the market.

NHTSA Probes Nearly 400,000 Infiniti, Honda Vehicles Over Steering Faults

As many as 391,000 vehicles from Honda and Infiniti may eventually need to be recalled as a result of two, separately announced Preliminary Evaluations from the National Highway Traffic Safety Administration to ascertain the scope of the potential safety hazards. In one of the queries, NHTSA is looking into 24 reports from drivers of the 2013 Honda Accord who say they had total loss of their power steering or experienced a sudden increase in the necessary effort to turn the wheel. In four cases, the problem may be linked to crashes. According to the claims, 13 people reported seeing a warning message during the failure. Turning off the car and restarting it would fix the issue in some cases. If a recall is necessary, it could affect an estimated 374,000 Accords. The second investigation is much smaller in scope. The safety agency is investigating the 2008 Infiniti EX35 after two complaints of the steering wheel shaft separating and the vehicle losing the ability to steer. Both reports say the steering became loose when driving and then completely failed once the vehicle was stopped. A recall for the problem would affect an estimated 17,000 vehicles. Recalls Honda Infiniti Safety NHTSA steering