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New Chevy Malibu helps parents monitor teen driver's performance

For teens, a driver's license can represent freedom. For parents, it can represent fear. Now there's a way parents can alleviate some of their worries and monitor their teen drivers. The 2016 Chevy Malibu, which debuted Wednesday at the New York Auto Show, contains a new feature that tracks driving performance and helps inexperienced drivers rein in some of their more dangerous habits. Accessed through a password in the car's infotainment system, parents can learn how far their child has driven, how fast they've gone and how many times they've braked hard, among other features. "It's an in-vehicle report card that gives parents information," says Mary Ann Beebe, one of the lead engineers who designed the system. "It's meant to be used as a teaching tool. Parents can sit down and talk with their teen about, 'Here are some areas where you're doing well, and here's some where you can use improvement.'" Car accidents are the leading cause of death for teens ages 16 to 19, and only last week, AAA released a study that found their driving behavior can leave them particularly susceptible to crashes. General Motors had sought ways to help educate and train younger drivers. In an era where data can be harvested from cars, monitoring performance is one way to provide information. Parents access the Teen Driver system in the car through a PIN-number entered into the Malibu's infotainment system. The report card can only be seen in the car – so far, it's not available via a smartphone app, like some other types of on-board diagnostic information. The system is activated by the use of a specially programmed key fob that lets the system know who is driving the car. Once the vehicle recognizes the key fob, it takes preventive measures to ensure safer conduct behind the wheel: Until the driver and front passenger buckle their seat belts, the radio is muted. Safety systems such as forward-collision assist and electronic stability control are automatically turned on. Parents can preset preferred speed limits, and drivers will hear a warning if that sound is exceeded. "We have these great technologies, and we want to make sure we turn them on for the teen," Beebe said. There are no geo-location aspects of the program, and data is stored on the car, not uploaded to the Cloud or even seen by General Motors, she said.

Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).