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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 delays fastback-like QX55 crossover until late 2020

Infiniti confirmed it has delayed QX55 production by about five months. The as-yet-unveiled crossover is a swoopier, more stylish evolution of the QX50 with a fastback-like roof line inspired by some of the company's past models. The Nissan-owned company informed its suppliers production will start in November 2020, not in June as previously announced. It explained it needs to "ensure production capability" at the Aguascalientes, Mexico, facility that will manufacture the model. It didn't provide additional details, though a spokesperson confirmed the new timeline to Automotive News. The factory — a joint-venture between Mercedes-Benz parent company Daimler and Nissan — also makes the QX50, the A-Class, the Kicks, and the Sentra, among other models. "Production schedules are internal and due to various operation priorities can move — sometimes forward, sometimes backward — as a normal course of business," a spokesperson told Autoblog.  The QX55 is based on the aforementioned QX50, and spy shots confirm the two models share several design cues when viewed from the front. Minor nameplate-specific details will set the 55 apart from the 50. It's a different story out back, where the 55 ditches the 50's family-friendly silhouette for a fast-sloping roofline penned with an eye on the first-generation FX released for the 2003 model year, five years before the original BMW X6.  Infiniti is not yet revealing technical specifications, but we expect the variable-compression VC-Turbo engine will be one of the available powertrains. The turbocharged, 2.0-liter unit makes 268 horsepower and 280 pound-feet of torque in the QX50. It also returns 26 mpg in combined driving, according to the EPA. What remains to be seen is whether the delay also affects the car's unveiling date, which hasn't been publicly announced yet. An Infiniti spokesperson told Autoblog the QX55 is scheduled to make its debut "in the next few months," and pointed out it's one of five new models due out in the next three years. When it does arrive, the Infiniti QX55 will compete in the same segment as the BMW X4 and the Mercedes-Benz GLC Coupe.

Listen to the 2020 Infiniti Q60 Red Sport 400's screaming exhaust

The best thing about the 2020 Infiniti Q60 Red Sport 400 is its engine. That 3.0-liter twin-turbo V6 makes one of the better noises in the automotive landscape on its way to the 6,800 rpm redline. It makes 400 horsepower and 350 pound-feet of torque, and the engine feels every bit that strong. Peak power is made at a high 6,400 rpm, so it feels linear all the way up to that point. There’s no mistaking this for a naturally aspirated engine with the lag off the line, but once itÂ’s up and running, thereÂ’s no obvious fading of power in the higher rpms. As for the sound Â… itÂ’s also pretty spectacular. We took the Q60 out to some of our favorite deserted backroads and let it rip with a GoPro attached to the bumper. This particular Q60 Red Sport 400 is fitted with a more aggressive exhaust from Infiniti. ItÂ’s an axle-back exhaust, aptly named the “Axle-Back Sport Exhaust Kit.” Infiniti sells the exhaust on its official online parts store — thereÂ’s one available for the Q60 and another for the Q50. ItÂ’s currently listed for $707 and is backed by the original factory warranty. Buy it from the store, and then have the dealer fit it to your new (or old) car. WeÂ’ve driven Infinitis with this engine that donÂ’t have the sport exhaust installed, and theyÂ’re nowhere near as loud. And after driving one with the exhaust, itÂ’s safe to say the factory exhaust is a bit too quiet for our tastes. Starting the cold engine up in the morning is much more satisfying. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. And under load this exhaust sounds fantastic, too. In the cabin we hear loud intake whooshes, and on the outside we get to hear its screaming yowl. ThereÂ’s enough sound deadening in the cabin to make it refined and luxurious on light throttle applications, but the exhaustÂ’s sound doesnÂ’t ever disappear. A bit of drone sneaks in on the highway, but if you turn up the decent-sounding Bose audio system, it fades away. More cars could use legitimately aggressive exhausts like this one. Manufacturers continue to pump fake audio into the cabin over the speakers, but itÂ’s not as authentic as something like this. All thatÂ’s missing are bangs and pops on shifts, but we can live without them. Each downshift is delightful, and the overrun is music to our ears. Related video: