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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).

C7 Corvette turbo with 1,000 horsepower promised from Hennessey

If you can't wait for the next-generation Chevrolet Corvette ZR1, Hennessey says they will have you covered. The Texas-based company has announced it will offer a spate of upgrades for the 2014 Corvette ranging from a range of bolt-on options all the way up to a 1,000-horsepower, twin-turbo system. Buyers can start with a cold air intake, cat-back exhaust or stainless steel long-tube headers, but Hennessey says it will also offer up three stages of forced induction mayhem should those bits and baubles not provide enough thrust.
Those choices start with a supercharger system good for up to 700 hp, though Hennessey will gladly ditch the blower in favor of two turbos. Doing so will spin the crank to the tune of 800 horsepower all the way up to a certifiably ludicrous 1,000 ponies. There's no word on how much these tricks will cost you - or when they will be available, as we're guessing they haven't gotten their hands on the car yet - but you can head over to the Hennessey site to drop them a line if you're curious.

2022 Chevy Suburban, Tahoe, GMC Yukon, Cadillac Escalade up another $1,600

The 2022 Chevrolet Tahoe and Suburban, the 2022 GMC Yukon and the 2022 Cadillac Escalade have all gone up by $1,600. The GM profit and loss department added $1,500 to the MSRP for each of the full-sized SUVs and $100 to their destination charges, that destination fee now $1,795 for each vehicle. It's not an inconsequential bump; however, considering where the trucks were priced at launch, and everything that's happened since, the latest retail prices don't seem that bad. Take the Suburban — in February 2020, Chevrolet practically carried over pricing for the truck with a revamped interior and independent rear suspension, starting it at $50,295 after destination. After this latest increase, the 2022 Tahoe LS in two-wheel drive costs $55,590, after destination.  The delta between the 2021 Suburban at launch in March 2020 and the current model is a little grander compared to the Tahoe, like the SUV itself. Back then, it started at $52,295, the same price as the outgoing model. After this third price increase in the past year, the 2022 Suburban LS in 2WD starts at $61,290 after destination. GM Authority says the 2023 Tahoe and Suburban are reportedly headed down production lines in the middle of July. The biggest addition to both models will be the availability of Super Cruise, which is already available on the sister SUV, the Cadillac Escalade. The hands-free driving assistance feature can only be optioned on the Premier and High Country trims. It costs $2,500 to put Super Cruise on the Escalade. GM hasn't divulged the feature's price yet for the Chevy twins; that's likely to come when the automaker announces 2023 Tahoe and Suburban MSRPs, so beware of more potential price increases. After that, there's a heavy refresh planned for the 2024 model year, including a new instrument panel design that looks like it replaces the current gauge cluster with a large, freestanding screen.  The Yukon's entry-level price goes up to $57,590 for the SLE trim turning the rear axle.   The Cadillac Escalade's second MSRP bump takes it to $81,235 for the Luxury 600 trim in 2WD, and $84,235 for the extended ESV model in the same trim. The price creep hasn't stopped Escalades from pulling off dealer lots almost as soon as they're delivered, sales for the first quarter of the year totaling 10,505 units, trouncing domestic and foreign competition. Related video: