2013 Nissan Sentra Sr With Super Low Miles 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.

Did Nissan send a ringer GT-R to run the 'Ring? [w/video]

It turns out that after toting a 7:08 time around the fearsome Nürburgring Nordschleife for the new Nismo-tuned GT-R, Nissan might not have been entirely honest about the car it was using. From what we've been hearing from a few different publications, the GT-R featured in the video isn't what we're going to see on the production model.
PistonHeads reported on the so-called "Time Attack" GT-R while it was in Japan for the Tokyo Motor Show, going so far as to detail the differences between it and the standard GT-R Nismo. And friends, this isn't just a matter of swapping tires. The mods made to the Time Attack car are far more comprehensive.
For a start, the TA produces more downforce thanks to larger aerodynamic pieces. It's some 110 pounds lighter than the standard car, thanks to new bucket seats. The ECU and dampers have been swapped for new units, and the brake pads are different as well. If you've read this far, you might be feeling slightly angry or betrayed that Nissan is toting numbers for a modified car. Don't be.

Waymo partners with Nissan, Renault on robotaxis outside U.S.

SAN FRANCISCO — Self-driving car pioneer Waymo is teaming up with automakers Renault and Nissan to make its first journey outside the U.S. with a ride-hailing service that will dispatch a fleet of robotaxis in France and Japan. The partnership announced late Wednesday underscores Waymo's ambition to deploy its driverless technology throughout the world in an attempt to revolutionize the way people get around. The Mountain View, California, company can afford to try because it's backed by one of the world's richest companies, Google, which secretly began working on driverless technology a decade ago before spinning off that project into what is now known as Waymo. After launching its ride-hailing service in France and Japan, Waymo intends to explore other European and Asian markets with Renault and Nissan. "This is an ideal opportunity for Waymo to bring our autonomous technology to a global stage," Waymo CEO John Krafcik said. Waymo, Renault and Nissan didn't set a timetable for when their ride-hailing service will launch. They left most other details vague. It seems likely it will still be several years before Waymo will be in a position to pose a serious challenge to Uber, the world's largest ride-hailing service. Although Waymo's self-driving technology is widely considered to be the world's most advanced, it still isn't adept enough to be trusted without a human poised to take control in case something goes awry with the robot. Waymo had hoped to launch a fully autonomous ride-hailing service last year in the Phoenix area, but instead is still keeping human safety drivers in those vehicles more than six months after it rolled out. That service, known as Waymo One, is still only offering rides to a few hundred passengers that previously participated in a test program. Krafcik told the German newspaper Handelsblatt last year that Waymo will likely use a different brand for its ride-hailing services outside the U.S. That could be one reason Waymo is working with France-based Renault and Japan-based Nissan, household names in their home countries. Waymo has previously struck deals with two automakers, Fiat Chrysler and Jaguar, but those involved ordering tens of thousands of vehicles to be equipped with self-driving technology for services in the U.S. So far, Waymo is only using Fiat Chrysler minivans for its Phoenix service. The partnership with Renault and Nissan also involves a long-time alliance they formed with Mitsubishi.