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'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).

A car writer's year in new vehicles [w/video]

Christmas is only a week away. The New Year is just around the corner. As 2014 draws to a close, I'm not the only one taking stock of the year that's we're almost shut of. Depending on who you are or what you do, the end of the year can bring to mind tax bills, school semesters or scheduling dental appointments. For me, for the last eight or nine years, at least a small part of this transitory time is occupied with recalling the cars I've driven over the preceding 12 months. Since I started writing about and reviewing cars in 2006, I've done an uneven job of tracking every vehicle I've been in, each year. Last year I made a resolution to be better about it, and the result is a spreadsheet with model names, dates, notes and some basic facts and figures. Armed with this basic data and a yen for year-end stories, I figured it would be interesting to parse the figures and quantify my year in cars in a way I'd never done before. The results are, well, they're a little bizarre, honestly. And I think they'll affect how I approach this gig in 2015. {C} My tally for the year is 68 cars, as of this writing. Before the calendar flips to 2015 it'll be as high as 73. Let me give you a tiny bit of background about how automotive journalists typically get cars to test. There are basically two pools of vehicles I drive on a regular basis: media fleet vehicles and those available on "first drive" programs. The latter group is pretty self-explanatory. Journalists are gathered in one location (sometimes local, sometimes far-flung) with a new model(s), there's usually a day of driving, then we report back to you with our impressions. Media fleet vehicles are different. These are distributed to publications and individual journalists far and wide, and the test period goes from a few days to a week or more. Whereas first drives almost always result in a piece of review content, fleet loans only sometimes do. Other times they serve to give context about brands, segments, technology and the like, to editors and writers. So, adding up the loans I've had out of the press fleet and things I've driven at events, my tally for the year is 68 cars, as of this writing. Before the calendar flips to 2015, it'll be as high as 73. At one of the buff books like Car and Driver or Motor Trend, reviewers might rotate through five cars a week, or more. I know that number sounds high, but as best I can tell, it's pretty average for the full-time professionals in this business.

Chevy trademark for E-Ray may signal Corvette hybrid or EV

A spy photographer and friend of Autoblog Chris Doane spotted this trademark filing with the US Patent and Trademark Office, and there's not much to it: Chevy is calling dibs on the "Corvette E-Ray" name, and that raises more questions than answers. Being obsessed with this industry is an Autoblog core value, and Corvette is perennially a big deal. It's also historically, and famously, resistant to change. So what's going on here? Unless it's a pure show car, it's unlikely the E-Ray will be a C7-based hybrid. The current Corvette is a tightly-packaged thing, and batteries are bulky. That makes a concept of some sort all the more likely, especially with the Detroit Auto Show coming up. Unconstrained by the packaging of the real-world Stingray, this E-Ray concept may be a pure EV, or a hybrid, of any configuration. GM has built mid-engined Corvette concept cars in the past, and maybe we'll see one again in a few weeks. A gutted C7 with a pure EV drivetrain is also a remote possibility, although less likely – the Stingray wasn't engineered with that in mind, and we think GM's too big to show off a hack-job at a major auto show. Not that it is a Corvette competitor, but don't forget that the Tesla Model S P85D and it's P90D successor have taken pure EV performance into the mainstream – the upper end of the mainstream, to be sure. It has been enough to draw industry performance players into the genre. Look at Aston Martin's production-possible RapidE concept, a pure EV, and the confirmed-for-production Porsche Mission E. We've heard rumblings in the past that Corvette may become a marque unto itself, spawning a variety of variants (including the hypothesized mid-engined production car – don't hold your breath). Perhaps the gas-powered C8, in whatever form it takes, will be complemented with a greener version. We'll try to dig up insider information about what the E-Ray will reveal itself to be, but rest assured that if it shows up at Detroit we'll bring you analysis of every inch of it.Related Video: Featured Gallery 2016 Chevy Corvette Z06 C7.R Edition View 9 Photos Tip: Chris Doane/Facebook Green Rumormill Detroit Auto Show Chevrolet Electric Future Vehicles Hybrid Performance corvette stingray