Gt-r 750 Hp Upgraded Turbos Upgraded Tires Rims 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.

Meet the Nissan GT-R test driver responsible for 'Ring tuning

Ever wonder what it's like to be a manufacturer's development driver at the Nürburgring? We imagine it's pretty cool. After all, you get to spend your days zooming about the greatest racetrack on the planet in a vehicle that is usually months or more away from consumers. For Hiroyoshi Kato, whose actual title is Technical Meister, life is even better than your typical development driver, because he spends his days wringing out the Nissan GT-R Nismo around the Green Hell.
Kato-san has a long history with both Nissan and the Ring. He had a major hand in the development of the R32, R33 and R34 Skyline GT-Rs, having first come to the Ring nearly three decades ago.
His experience with the Nismo, though, is different than the other vehicles he's contributed to. As he explains it, there are real racers on hand to test the car on the track, like Formula One reserve driver Sébastien Buemi. Instead, Kato focuses on the track-to-road balance. Still, he has some truly interesting insights on the car and the track, including his surprise at turning a sub-eight-minute lap in his first outing. That, along with a few other things (one of which is an R34 being hustled about), make this a must-watch video from Nissan.

2018 Mitsubishi Eclipse Cross vs. small crossover SUVs: How they compare on paper

In the midst of the crossover SUV boom, each traditional size segment has become saturated. As a result, automakers are beginning to fill the gaps that separate classes, giving us some interesting in-between options. The all-new 2018 Mitsubishi Eclipse Cross jumps right into one of those in-between categories bookended by compact and subcompact crossovers. It's a niche that offers more space and feature content than the smallest vehicles, with an extra dose of style and a lower price than bigger ones. Because of the Eclipse Cross' in-between nature, though, there's not really an obvious direct competitor. As such, we've selected a diverse group of small crossovers that are similar to the Eclipse Cross in some but not all key areas: size, price, feature content, style and likely buyers. The 2018 Subaru Crosstrek, 2018 Toyota C-HR and 2018 Nissan Rogue Sport each have elements in common, but are different enough to provide useful points of comparison. A chart of specifications and key standard features is shown below, followed by more in-depth analysis. And if you wish to compare these crossovers with others not listed, be sure to check out our comparison tools. Engines and Drivetrains One of the Eclipse Cross' biggest advantages in this segment will be its engine. Subcompact crossovers, including the other three we've chosen, are sluggish to say the least. This new Mitsubishi should be different as it packs a turbocharged 1.5-liter four-cylinder that belts out a whopping 184 pound-feet of torque. We say whopping, because the C-HR, Crosstrek and Rogue Sport all have between 139 and 147 pound-feet. Horsepower is similarly unimpressive at just 152 horsepower - the same as the Crosstrek - but that torque should make passing and on-ramp runs much more satisfying. The appeal of crossovers for many people is the availability of all-wheel-drive, and this is where the Subaru gets an advantage. Like with all Subarus that aren't a BRZ, the Crosstrek has standard all-wheel drive. The Mitsubishi comes close, making all-wheel drive standard on every trim level except the very base ES trim level. On the Rogue Sport, all-wheel drive is an option on all trim levels. Depending on where you live, though, being able to have front drive on a high-trim crossover could be a plus because it will save some money and improve fuel economy. The C-HR loses this battle as it's only available with front-wheel drive.