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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).

2016 Chevrolet Malibu Hybrid: 48 mpg for $28,645

With the 2016 Chevrolet Malibu Hybrid, General Motors wants to show it's as serious about mainstream hybrids as it is about mainstream midsize sedans. Keeping with the theme, Chevy announced the Malibu Hybrid will have a serious price tag of $28,645. Chevy said Thursday the 2016 Malibu Hybrid will go on sale in the spring, with that price also including an $875 destination charge. That's about $3,000 more than where the Ford Fusion Hybrid kicks off, and about $2,000 more than a Toyota Camry Hybrid LE. The big news being pushed with the Malibu Hybrid, however, is the fuel economy. GM says it's capable of 48 miles per gallon city and 45 highway, for a combined rating of 47 mpg. That's better than any other 2016 midsize hybrid sedan. Power comes from a 1.8-liter gasoline engine and an electric motor with a 1.5-kWh lithium-ion battery, producing 182 combined horsepower. That's competitive with both the Camry and Fusion. Chevy also likes to say it's roughly the same system as the one installed in the 2016 Volt – although with a smaller battery, larger gas engine, and without the plug – so the Malibu Hybrid has that halo effect going for it. With both this Malibu and 2016 Toyota Prius, there's a lot of activity around gas-electric hybrids amid lowering fuel prices and a raft of plug-ins and full-electrics. The gas-only 2016 Malibu was found to be, "at least good again," so the 2016 Malibu Hybrid should be able to attract those who want a competent midsize sedan with excellent fuel economy that awaits EPA verification. We'll go with that thought until we get to drive it. Related Video: NEXT-GEN CHEVROLET MALIBU HYBRID LT STARTS AT $28,645 Projected to offer 48 MPG city using technologies borrowed from Volt DETROIT – The 2016 Chevrolet Malibu Hybrid LT, which achieves a General Motors'-estimated 48 mpg city, will be available this spring with a starting price of $28,645. "The Malibu leverages knowledge and technology directly from the second-generation Chevrolet Volt," said Steve Majoros, marketing director of Chevrolet Cars and Crossovers. "By leveraging technology, we are broadening our level of expertise and lessons learned to bring consumers a world-class hybrid." With an all-new, hybrid powertrain that uses a slightly modified drive unit and electric motors used in the 2016 Chevrolet Volt, the Malibu Hybrid offers a GM-estimated 48 mpg city, 45 mpg highway – and 47 mpg combined, unsurpassed in the midsize car segment. Official EPA estimates are pending.

2018 Mazda6, Porsche Panamera and Nissan Titan | Autoblog Podcast #541

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Green Editor John Beltz Snyder and Associate Editor Reese Counts. We talk about driving the updated, turbocharged 2018 Mazda6, 2018 Porsche Panamera Sport Turismo 4S Sport Turismo and the 2018 Nissan Titan S 4x4 King Cab. We also discuss aftermarket parts for the Chevy Colorado, pick our favorite 50th Anniversary Hot Wheels and, as always, help a listener buy a new car in our "Spend My Money" segment. Autoblog Podcast #541 Your browser does not support the audio element. Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we've been driving: Mazda6, Porsche Panamera, Nissan Titan The aftermarket takes on the Chevy Colorado 50th Anniversary Hot Wheels Spend my money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Aftermarket Podcasts Chevrolet Mazda Nissan Porsche Car Buying Truck Wagon Sedan Hot Wheels porsche panamera sport turismo