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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).

2015 Chevrolet SS Review [w/video]

The Chevrolet SS is one of the best cars no one's buying. It's a Bowtie-badged version of the Australian Holden Commodore with a 6.2-liter LS3 V8 under the hood. It's got a six-speed manual transmission, General Motors' sophisticated Magnetic Ride Control suspension, and rear-wheel drive. It's a fullsize sedan that comes with every possible amenity you could want. And it's less than $50,000. Chevrolet sold 2,479 SS sedans in 2014. That means it was outsold by every other vehicle the automaker offers, even the police fleet-only Caprice. (I'm only talking about cars that were on sale for the full 2014 calendar year, of course.) The aforementioned manual transmission and MRC suspension were added for 2015, but it's not clear if that's helping. The SS is down 7.7 percent through June of this year, compared to 2014's numbers. But hey, at least it's finally outselling the Caprice. What a damn shame. Granted, GM only planned to sell a few thousand of these each year, but as enthusiasts, this a car we should be gobbling up. It's the closest we'll get to a four-door Corvette, and with the 2015 model year updates, that statement is more true than ever. People often mistook the SS for a Malibu. "Is that a rental car?" Yikes. Aside from the manual gearbox and magnetorheological suspension, the SS is largely unchanged through its year and a half of sales. But that's no bad thing – we were thoroughly impressed with the SS when we first tested it at the end of 2013. Outside, the SS looks the same, which is a bummer. It is not an attractive car, and the chrome brightwork on the side vents and wheels doesn't help. That said, the sedate styling puts it under the radar – more so than competitors like a Dodge Charger 392, anyway. But maybe it's too under the radar. Even in the new, "Some Like It Hot Red" color (yes, really), photographer Drew Phillips reports that people often mistook the SS for a Malibu. "Is that a rental car?" Yikes. Exterior styling is our only gripe with the SS. Moving inside, there's a lot to like. This is easily one of Chevy's nicest, well thought-out interiors (thanks, Holden), with premium materials and tons of equipment. The Chevy MyLink infotainment system carries over, and now features 4G LTE and wifi connectivity. The touchscreen is a bit slow to respond, but otherwise, it's bright, well organized, and packed with functionality. This is easily one of Chevy's nicest, well thought-out interiors.

Junkyard Gem: 1985 Chevrolet Sprint

For in the 1985 model year, General Motors began selling Chevrolet-badged Suzuki Cultus hatchbacks in California. Sales of the cheap three-cylinder econobox in the rest of North America followed soon after (with the Canadian version known as the Pontiac Firefly), and did pretty well considering the crash in gasoline prices during the middle 1980s. Starting in 1988, the facelifted Sprint became the Geo (and, later on, Chevrolet) Metro. Here's one of the very first Cultuses sold on our shores, found in a San Francisco Bay Area car graveyard. Amazingly, the primitive rear-wheel-drive Chevrolet Chevette remained available all the way through 1987, competing with the thriftier front-wheel-drive Sprint in the same showrooms. For 1988, Pontiac started selling a rebadged Daewoo LeMans, so the Sprint/Metro never lacked for intra-corporate competition. Inside, you'll find the same stuff most mid-1980s Japanese econoboxes got: tough cloth upholstery and long-wearing hard plastics. Suzuki quality in 1985 wasn't quite up to Honda or Toyota levels, but you weren't paying Honda or Toyota prices for the Sprint. MSRP on this car started at $4,949, or about $12,000 in 2020 dollars. The cheapest possible 1985 Chevette cost $5,340, while a new no-frills Ford Escort would set you back $5,620. Subaru, however, could have put you in a punitively unappointed base-model Leone hatchback for just 40 bucks more than the Sprint that year. I think I'd have sprung the extra for a $5,348 Toyota Tercel, a $5,195 Mazda GLC, or— best cheap-commuter deal of all that year— the $5,399 Honda Civic 1300 hatchback. I was 19 years old and driving a Competition Orange 1968 Mercury Cyclone that year, and I recall feeling pity for Chevy Sprint drivers, new-car smell or not. Still, these weren't bad cars for the price, though a Sprint with an automatic transmission was a real character-builder. Got three cylinders and uses 'em all! 48 horsepower from this hemi-headed SOHC 1-liter. The Turbo Sprint — yes, such a car existed — had a howling 70 horsepower. The hood-latch release is a rectangular button that resembles a badge. 1985 Chevy Sprint Commercial The highest-mileage, lowest-priced car you can buy. 1985 holden barina commercial The Australian-market version was the Holden Barina, and the TV ads featured the Road Runner. 1983 SUZUKI CULTUS Ad In its homeland, this car got screaming guitars and a drive through New York City for its TV commercials.