2003 Infiniti G35 Sport Sedan on 2040-cars

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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 recalls Q50 and Q70 Hybrid models

Infiniti is issuing three separate recalls for its Q50 Hybrid and Q70 Hybrid and M35 Hybrid covering roughly 13,794 vehicles in North America.
The larger campaign listed by the National Highway Traffic Safety Administration covers 5,831 examples of its 2014 Q50 Hybrid (shown above) and 2014 Q70 Hybrid in North America, with 5,412 of those in the US and its territories. According to NHTSA, "due to a software error, the electric motor may stop working while the vehicle is being driven using the electric motor only," creating a "stall-like condition." To fix the fault, the company is reprogramming the motor inverter software, and owners should be contacted in mid-November.
The second recall covers just 890 2014 Q50 Hybrid and 2014 Q70 Hybrid models in North America, with 817 of those residing in the US. It's possible that their transmission housings were damaged during manufacturing, and on affected models, the housing could have a crack that might fracture while driving. Dealers will inspect the transmission and faulty examples will be replaced.

Infiniti Q50 Eau Rouge Concept could be something special

With one of Infiniti's chief goals being to adopt a less US-centric product lineup and burnish its standing on the global stage, Nissan's premium outpost will have to get serious about enhancing its offerings' performance and image credentials if it wants to take on the Germans model for model. It dabbled with the idea when it launched its Infiniti Performance Line (IPL), but its sole emissary to this point, the G37 IPL, offered little in the way of actual enhanced performance, focusing instead on visuals and a hefty price tag. This just-revealed Q50 Eau Rouge Concept suggests Infiniti is starting to get the message. Based on the cooking Q50, the Eau Rouge concept features both enhanced visuals courtesy of much more aggressive (and 20-millimeter-wider) carbon fiber bodywork inspired by the company's RB9 Formula One car and an improved stance thanks to a lowered, firmed suspension. As for what's lurking underhood this Detroit Auto Show star, that may be as much a theoretical at this point as anything else, but Infiniti president Johan de Nysschen offers a hint: "If we built this car I would expect it to feature over 500 horsepower and 600 pound-feet of torque," power arrived at via "a big personality, V-cylinder engine with forced induction." Johan, that sounds like a fine place to start. Infiniti Q50 Eau Rouge: Muscular, purposeful, refined - Q50 Eau Rouge concept provides a glimpse of Infiniti's design prowess for high-performance vehicles - Exterior features Infiniti Red Bull Racing Formula One design influences - Q50 Eau Rouge hints at future powerful product line Detroit / Hong Kong – The Infiniti Q50 Eau Rouge, revealed at the 2014 NAIAS Detroit Motor Show, is a concept car that expresses Infiniti's design vision of a high-performance Q50 premium sports sedan. The Q50 Eau Rouge embodies the arresting design features of the Q50 premium sports sedan – infused with the enticing spirit of Formula One. Featuring bespoke aerodynamic carbon fiber bodywork, Q50 Eau Rouge is lower and wider, possessing genuine road presence. This striking design is inspired by muscularity, aerodynamics, refinement, and understated power. "If we built this car I would expect it to feature over 500hp and 600lb/ft of torque. Through our various alliance partners we have access to a range of engines featuring this performance capability which, with a fair amount of engineering effort, can be developed to exhibit Infiniti character and accommodated within the Q50 engine bay.