2005 Infiniti Fx35 Base Sport Utility 4-door 3.5l 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.

2020 Infiniti Edition 30 models priced

The 2020 model year marks the 30th anniversary of Infiniti, and as announced back in August, the brand is rolling out specially tweaked Edition 30 models across the bulk of its lineup. We now have more details and pricing for the commemorative editions, which are available on the Q50 sedan, Q60 coupe, QX50 compact crossover, QX60 mid-size crossover, and QX80 full-size SUV. The Q50 Edition 30 sedan's starting price is $43,700 with rear-wheel drive and $45,700 is all-wheel drive. The Q50 Edition 30 is priced between the Luxe and Sport trim levels, but its equipment is closer to that of the Sport. Although it's $4,800 cheaper than the Sport, the Edition 30 adds full-speed adaptive cruise control, but it uses the smaller brake rotors of the Luxe trim and it skips the Sport's adaptive damping. Unique Edition 30 elements include dark-chrome 19-inch wheels and exterior trim, black mirror caps, and a black mesh grille. The Q60 Edition 30 coupe is offered as a $4,200 package for the Luxe trim level. Added to the $45,500 base price of the rear-wheel-drive Luxe coupe, and you get a starting price of $49,700 for the Edition 30. All-wheel drive is another $2,000. Exterior enhancements mirror those of the Q50 Edition 30. The Q60 Edition 30 package also adds navigation, an around-view monitor, power-adjustable steering column, memory settings, rear auto-braking, adaptive cruise control, heated seats and steering wheel, and a few lesser items. The QX50 Edition 30 compact crossover builds on the mid-level Essential trim level. It's sold as a package for $1,200 and includes adaptive cruise control, blind-spot intervention, lane-depature prevention, and adaptive front lighting, plus 20-inch dark-finish wheels, dark-chrome exterior accents, a body-color rear diffuser, and a black headliner. For the range-topping QX80, the Edition 30 is a package that adds $3,500 to the Luxe (base) trim level. Besides the dark-chrome exterior trim and dark-finish 22-inch wheels, it includes a rear camera mirror, lane-departure prevention, adaptive cruise control, blind-spot intervention, and a black headliner. On Infiniti's most popular vehicle, the QX60, full details of the Edition 30 are not yet available, but we're told the model will start at $50,850. That represents a $4,700 premium over the Luxe trim level, and includes the content of the ProAssist package as well as the Edition 30 design enhancements.

Infiniti Q50S getting G37's hydraulic steering for 2016

Sometimes, new technology doesn't make things better. Take the march of power steering technology as an example. Electrically assisted systems are in vogue at the moment for their ability to increase fuel efficiency, but tuning them to offer good feedback remains something of a dark art. Some automakers get it, but most don't. The previous hydraulically assisted setups just seem to be inherently more communicative when driven with enthusiasm. And it looks like Infiniti might be learning this lesson the hard way.
In talking with Keith St. Clair, the luxury brand's head of product planning, Car and Driver has learned that the Q50S is probably going to ditch its standard electrically assisted steering in favor of a hydraulic system derived from the old G37, a model soon to be renamed the Q40. The system should make the sedan more engaging behind the wheel, but it still won't help those who tick the option box for Infiniti's controversial Direct Adaptive Steering drive-by-wire system.
According to St. Clair, Infiniti's engineers have heard the complaints of critics and previous G37 owners about the Q50S model's electric steering system, and wanted to see what they could do. They didn't have to go far to figure it out - all it required was taking the steering rack off of a G37 and putting it onto the Q50S. After a little tweaking, "the car is a blast to drive," St. Clair reports. Now, the company is said to be fast-tracking the switch, and it could be ready for the 2016 model year.