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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).

How to locate a fleet Chevy Caprice PPV you can buy

The Chevy Caprice shares the same platform as the now-defunct Pontiac G8 and Chevy's SS sedan. The Pontiac G8 received excellent reviews, but the economy was not doing so well, and gas prices were high, so no one bought them and Pontiac went under. The Caprice PPV is available with a 3.6-liter V6 with 300 horsepower or a 6.0-liter V8 with 355 hp. It comes standard with heavy-duty suspension and a limited-slip differential on the V8 model. The Chevy Caprice also received praise for its handling and road manners and even received a perfect score in a past assessment by the LA County Sheriff's Department. Unfortunately, you won't be able to buy one new even if you want one. The Chevy Caprice PPV is a fleet vehicle available only to law enforcement. However, if you go on Cars.com, select Chevrolet in the dropdown, click all types of vehicles, change the year filter from 2011 to 2015 and type in the keyword Caprice, lo and behold, listings for pre-owned Caprice PPVs appear. Many of these have low mileage and were not sold for whatever reason, and they sat around. Some come with the remainder of the three-year / 36,000-mile bumper-to-bumper warranty and a five-year / 100,000-mile warranty on the powertrain. Those who have strong negotiating skills can extend the bumper-to-bumper warranty a couple of years for around $1,500 or less. The purchase price of the Caprice PPV is around $30,000 to 34,000. The pre-owned ones are less; dealers took the brunt of the depreciation cost. Best of all, the bonus of driving a Chevy Caprice PPV is everyone driving around you will follow the speed limit and every motor vehicle rule in the book because they think you are the law. Used ex-law enforcement fleet purchase are risky. But this is too unique to pass up, go buy one quick. There are only a couple in the country at the moment. Follow me on Twitter: Donkleblanc Related Video: Image Credit: wikimedia Chevrolet Used Car Buying Police/Emergency chevy caprice chevy caprice ppv open road

Autoblog's guilty pleasure cars

Guilty pleasures are part of life – don't even try to pretend like you don't have one (or two, or six). In the non-automotive space, this could come down to that secret playlist in your iPhone of songs you'll only listen to when you're alone; or think of that one TV show you really do love, but won't admit to your friends. I've got plenty, and so do you. Going back to cars, here's a particularly juicy one for me: several years ago, I had a mad crush on the very last iteration of the Cadillac DTS. Oh yes, the front-wheel-drive, Northstar V8-powered sofa-on-wheels that was the last remaining shred of the elderly-swooning days of Cadillac's past. Every time I had the chance to drive one, I was secretly giddy. Don't hate me, okay? These days, the DTS is gone, but I've still got a mess of other cars that hold a special place in my heart. And in the spirit of camaraderie, I've asked my other Autoblog editors to tell me some of their guilty pleasure cars, as well – Seyth Miersma, as you can see above, has a few choice emotions to share about the Mitsubishi Lancer Evolution. Read on to find out what cars make us secretly happy. Mercedes-Benz SL65 AMG This decadent convertible is the epitome of the guilty pleasure. It's big, powerful, fairly heavy and it's richly appointed inside and out. It's a chocolate eclair with the three-pointed star on the hood. Given my druthers, I'd take the SL65 AMG, which delivers 621 horsepower and 738 pound-feet of torque. That output is borderline absurd for this laid-back convertible. I don't care. You don't need dessert. Sometimes you just crave it. The SL line is about the feel you get on the road. The roof is open. The air, sun and engine sounds all embrace you. It's the same dynamic you could have experienced in a Mercedes a century ago, yet the SL gives you the most modern of luxuries. An Airscarf feature that warms my neck and shoulders through a vent embedded in the seat? Yes, please. Sure, it's an old-guy car. Mr. Burns and Lord Grantham are probably too young and hip for an SL65. I don't care. This is my guilty pleasure. Release the hounds. – Greg Migliore Senior Editor Ford Flex I drove my first Flex in 2009 when my mother let me borrow hers for the summer while I was away at college. The incredibly spacious interior made moving twice that summer a breeze, and the 200-mile trips up north were quite comfortable.