2006 Infiniti G35 X Sedan 4-door 3.5l on 2040-cars

Auto blog

Infiniti's variable compression engine in the 2019 QX50 is the first of its kind

The world's first variable compression ratio engine is here, in a production car. That car is the 2019 Infiniti QX50, debuting this week at the Los Angeles Auto Show. The midsize crossover has seen a refresh that has brought it an all-new platform together with new driver assist features, but it's the engine that's the centerpiece here. Nearly everything is continuously variable under the hood of the QX50 – not only the new shift-by-wire XTRONIC CVT. The new VC-Turbo gasoline engine is able to change its compression ratio from 8:1 to 14:1, or anything in between depending of the driving situation; whether there is need for top-end power or turbodiesel-like torque from low revs, or optimized fuel economy. The pistons' reach is continuously adjusted by an electric "Harmonic Drive" motor, which controls a multi-link system, affecting the top-dead-center of the pistons and changing the compression. The engine can also switch between efficiency-maximizing Atkinson cycle and regular combustion cycle, on the go – and there's both multipoint injection and gasoline direct injection employed. The result is 268 horsepower at 5,600 rpm and 280 pound-feet of torque at 4,400 rpm; good figures for a 2.0-liter four-cylinder gasoline engine with a single-scroll turbocharger. Infiniti says that the FWD version's fuel economy of 27 miles per gallon combined is 35-percent better than the previous-generation V6 engine; in AWD guise, it reaches 26 mpg, which is a 30-percent improvement. The new engine is pretty much all-aluminum, but the vaguely magical-sounding "transformative multi-link components" behind the variable compression system are made from high-carbon steel alloy. The engine's multi-link system also enables it to do away with any balancing shafts, and Infiniti compares its smoothness to a V6 rather than a regular four-cylinder. In addition to the aforementioned tech, the VC-Turbo engine has the world's first active engine mount vibration damping system to smoothen its operation even further. Related Video:

2019 Infiniti QX50 First Drive Review | A high-tech engine flies under the radar

Update: An Infiniti representative reached out after this review was published and noted that the "Park with Easy Steering" function of the Direct Adaptive Steering system was erroneously left engaged. Infiniti says this feature "reduces feel considerably at low speeds to aid in parking", and that the Easy Steering function will be disabled by default in customer cars unless the customer chooses to engage it. This seems to explain the issues our reviewer had with low-speed steering feel, although we've had other problematic experiences with Direct Adaptive Steering in a broader sense – not to mention the fact that the drive-by-wire system has been recalled several times to fix various issues, and also recalibrated in response to criticism. We hope to get another QX50 soon, and if so we'll compare the low-speed steering response with Easy Steering on and off. Even as manufacturers rush headlong into electrification and autonomous driving, revolutionary internal-combustion engine technologies are still being developed. Consider the Mazda Skyactiv-X Spark Controlled Combustion Ignition process, for example. But Infiniti's VC-Turbo four-cylinder engine, which makes its debut in the 2019 QX50, is truly a work of engineering fortitude. The engine realizes the long-held ambition among engine manufacturers to create a way to alter the compression ratio on the fly, a boon to both power and fuel efficiency. It's a brilliant bit of science that's, unfortunately, still in search of the right car. Don't get us wrong, the QX50 is perfectly competent — it's an exceedingly quiet and comfortable cruiser. However, it's no longer the driver-pleasing machine its predecessor was. That car, originally known as the EX35, was built atop Nissan's sporty FM platform, a front-midship, rear-wheel-drive layout putting the engine aft of the front axle line and giving the vehicle the athletic driving dynamics of a sport sedan. In fact, it was basically a G37 hatchback, and it was sold as the Skyline Crossover in Japan. A shortened FM chassis underpinned the 370Z, to put a finer point on it. For those more concerned with comfort than corners, the 2019 QX50 might actually be a more useful. It rides atop an all-new front-wheel-drive chassis, which means it's able to add more space for both passengers and cargo. It trades a heap of the old QX50's sportiness for comfort and packaging efficiency. If that sounds good to you, perhaps the new QX50 is the right crossover.

2020 Infiniti QX50 Luggage Test | Not infinity, but enough

The 2020 Infiniti QX50 is a comfortable five-seat luxury crossover that competes with the Audi Q5, Acura RDX, Volvo XC60, Lexus NX and others. If you’re interested in a QX50, itÂ’s probably got something to do with its impressive, technologically advanced VC-Turbo variable compression engine. It also has sumptuous swales of bodywork, a long list of driver-assist and safety features, and a solidly luxurious interior with a two-screen infotainment setup. The window sticker for the QX50 we drove recently in Essential trim says the seats were leatherette; if true, itÂ’s the most buttery fake leather out there. Still, the engineÂ’s the star. If performance is your only consideration, you can also get the VC-Turbo in the Nissan Altima sedan weighing 400 to 500-plus pounds less and at an MSRP starting $7,500 lower, a price spread that quickly expands as you option up the QX50. But if you want the QX50, itÂ’s probably because itÂ’s a crossover. You want to haul stuff. Which brings us to: luggage test. The QX50 has a cargo capacity of 31.1-31.4 cubic feet behind its raised back seat, which expands to 65.1 cubic feet with the rear seats down. That's more than most in its class, and the QX50Â’s cargo hold certainly looks big and usable enough. To test it, I had six roller suitcases at my disposal. Three would need to be checked at the airport, and one of those is particularly mondo (29x19x11, 26x17x10, 25x16x10). Three others were small enough to carry on (24x14x10, 23x14x11, 22x14x9). Several bags have four wheels that protrude and were counted in the dimensions. I lacked access to RiswickÂ’s wifeÂ’s fancy bag. An asterisk to all our luggage tests: Our crack team of test suitcases is empty. I know someone who can seriously overstuff a soft-sided bag, so depending on how you pack, your results may vary. The QX50 didn't arrive with a cargo cover, so that made things easier. My first stab at loading all those bags seemed promising — five out of six bags fit. Two of the big boys on edge, three carry-ons standing up. That would be one bag for every occupant, but hey, we can do better.  Standing them all up was the easy solution. This fits all six bags, and I'm certain they wouldn't fly forward in a hard stop. But the driver's rear view is impeded. I'd be annoyed to look back at this throughout a long trip. That biggest bag is the biggest offender, so can we just lay that one down? Sure, but we're back to just five bags fitting.