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New details emerge on Inifiniti QX50’s unique new variable-compression engine

Infiniti will release the world's first production variable-compression engine when it releases the 2019 QX50 midsize SUV sometime next year. Now we have some new details on the innovative new engine, which Infiniti is calling VC-T, for Variable Compression Turbo, after the luxury brand offered a prototype test drive. We wrote extensively about the complicated technology underpinning the new engine last year. It's the latest novel development that could represent a range-extender, if you will, for the embattled internal combustion engine in an era when automakers and governments are shifting their focus to electric vehicles. The VC-T is a new inline-four, 2.0-liter that combines the power of a high-performance turbo gasoline engine with the torque and efficiency of an advanced diesel engine, but without the latter's notorious emissions. It features the ability to seamlessly raise or lower the stroke of the pistons in the combustion chamber, depending on the driving conditions it detects and inputs from the driver, to select the best compression ratio—anywhere between 8:1, typical for high-performance engines, and 14:1 for high efficiency. In essence, it delivers the performance of a V6 but is much more efficient, with improved fuel efficiency of between 10 to 15 percent with its best competitors, per Car and Driver. You can view how it works in motion via the video below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. It's also quieter, more lightweight and compact than V6 engines with comparable power outputs, estimated at 268 horsepower and 288 pound-feet of torque. In a prototype test drive, Car and Driver writes that the engine "felt very conventional" and responsive, with strong and smooth acceleration. "The only indication you have that the compression ratio is changing is from an indicator in the instrument cluster next to the boost gauge." The engine is expected to deliver fuel economy gains of 27 percent in combined city-highway EPA rating over the outgoing QX50, which had a 3.7-liter V6. The 2019 model, fitted with the VC-T, should get about 26 mpg in combined fuel economy, and it will get to 60 mph almost one second faster than its four-cylinder counterparts, Nissan's chief powertrain engineer, Shinichi Kiga, told Automotive News. The VC-T engine is the result of 20 years of development spanning more than 100 prototypes and around 300 patents at Nissan.

A beautiful conundrum | 2017 Infiniti Q60 First Drive

"OK, this should be fun." Hands are rubbed together excitedly. It's a rear-wheel-drive sport coupe painted candy apple red. It's sleek, slinky, and uniquely styled. It's from the same folks who, in the 2000s, finally showed that BMW could be matched in the whole sport sedan/coupe game. Oh, and it has 400 horsepower. Four-hundred! With a four. And yet the 2017 Infiniti Q60 underwhelms. What looks so good on paper instead is rather conflicted, stuck somewhere in no-man's land between the traditional expectations of a performance sport coupe and those of comfier, more luxurious cruisers that isolate and pamper their occupants. It's a serious effort with serious engineering and a clear desire to be innovative, but at least in the range-topping Red Sport model we tested, it fails to come together in a way that truly excites or indulges. A great coupe should do one or the other, and ideally both. To explain, let's start under the hood, where Infiniti's all-new "VR" series 3.0-liter twin-turbo V6 makes its second appearance after debuting in the Q60's four-door sibling, the Q50. In the Q60 Silver Sport model, it produces 300 horsepower and 295 pound-feet of torque courtesy a pair of turbochargers that create 8.7 psi of boost. In the Red Sport, the knob is turned up to 14.7 psi, resulting in the oh-so-salivatory magic number of 400 hp along with 350 lb-ft of torque. A device known as an optical turbo speed sensor, special to the Red Sport, manages and maintains that extra boost, while an electric motor fitted to the valve timing system serves to quell any loss in throttle response due to forced induction. The Red also gets a second water-cooled intercooler, which, in both models, is distinctive for its more compact size, shorter airflow path, and, according to Infiniti, a resulting reduction in turbo lag and more immediate engine response. It's certainly a clear improvement on the somewhat rough 3.7-liter "VQ" V6 it replaces, which increasingly felt and sounded a little out of place in a luxury car. The new VR30DDTT, as it's so eloquently named, is buttery smooth and indeed responsive, likely capable of convincing luxury-car owners used to naturally aspirated V6s that everything's business as usual. Honestly, its character is reminiscent of a silky Honda V6. In some respects, that's a great thing. In others, it's where the Q60 starts to fall flat.

Infiniti QX55 Luggage Test | The price to be paid for a coupe

The Infiniti QX55 is the crossover-coupe version of the QX50, which like other such variants available throughout the industry, chops the roofline and cargo area down to create a "coupe-like" appearance. Obviously, this results in a reduction in cargo capacity, but because that reduction is largely above the back seat line, the actual reduction in usable cargo space isn't as great as you might expect. While carrying a large box or some other tall, bulky thing will be more difficult, smaller items like suitcases won't necessarily be much different since carrying them above the back seat line can reduce or eliminate rear visibility and create a hazard by flying forward while stopping as well. It's for those very reasons I don't stack to the roof in luggage tests. Now, I have not tested the QX50, so I have no point of comparison in that regard. But I have tested a variety of crossover-coupes and the QX55 does indeed share common attributes ... and detriments.  On paper, the Infiniti QX55 has 26.9 cubic-feet of cargo space behind its back seat. That is basically the same as the Audi e-Tron Sportback and a bit less than the Mustang Mach-E and Toyota Venza. The Cayenne Coupe figure just seems inaccurate.  The QX55's back seat reclines, however, so its amount is variable. I do not know where Infiniti set it while doing it's measurement, but I set it for a comfortable degree comparable to most fixed back seats. You can also easily lower the back seat with handles in the cargo area. Both elements are pictured below.  Now, let's get to the bags. As in every luggage test I do, I use two midsize roller suitcases that would need to be checked in at the airport (26 inches long, 16 wide, 11 deep), two roll-aboard suitcases that just barely fit in the overhead (24L x 15W x 10D), and one smaller roll-aboard that fits easily (23L x 15W x 10D). I also include my wife's fancy overnight bag just to spruce things up a bit (21L x 12W x 12D). Cool, that was easy. All the bags easily fit with minimal Tetrising and ... Oh no. Wait, they don't. Despite all the bags seeming to be clear of the liftgate, the power-closing function got stuck repeatedly. I could slam it shut manually, but that's another no-no here at Luggage Test Portland in order to keep things consistent.  I then Tetrised and Tetrised and Tetrised again. No good, no good, no good. "Boy, what an annoying cargo area," I said to an empty street. This is what eventually worked after the sixth attempt.