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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).

Weekly Recap: Bentley Bentayga leads luxury SUV charge at Frankfurt

The Bentley Bentayga is launching a new era of ultra high-end sport utility vehicles that will see luxury makers vie for the world's richest and most exclusive customers. The Bentayga is Bentley's first SUV, and it will formally debut next week at the Frankfurt Motor Show. It's loaded with Bentley's best technology and features, led by a 600-horsepower W12 engine. The mission is simple: stop giving up sales to other companies by not having an SUV in its portfolio. "It creates an entirely new category of ultra-luxury SUV, where there are currently few rivals," IHS Automotive analyst Ian Fletcher said in a report. But Bentley and the Bentayga will soon face stiff competition. Archrival Rolls-Royce will produce its own crossover to be built in England, though timing is unclear. Lamborghini has approved plans for a ute that will be assembled in Italy and launch in 2018. Even the sportier British brands are getting into the market. Aston Martin will make a crossover version of the DBX concept shown earlier this year in Geneva, and Jaguar is launching the F-Pace crossover, which will debut in Frankfurt. These new entries will invigorate a segment that's comprised of the Mercedes G63 AMG and the Land Rover Range Rover SV Autobiography, and Bentley is poised to grab a large share of it, Fletcher noted. IHS forecasts Bentayga sales could hit 3,000 units per year in 2017 and 2018, pushing total Bentley sales to more than 10,000 in the next few years. The vehicle will also get plug-in hybrid and diesel variants to widen its reach. The Bentayga is a sales grab, for sure, but Bentley took care to ensure the SUV remained true to the brand. It's laden with the top-shelf wood, leather, and metal, and it comes standard with an expansive panoramic glass roof. It also has intelligent features like electronic night vision and an optional responsive off-road system that can be configured to adapt to eight different settings. It's a different kind of Bentley, but it's a harbinger of things to come for the world's richest luxury makers. Other News & Notes Toyota debuts next-gen Prius Toyota revealed the next-generation of its iconic fuel-sipping hybrid, the 2016 Prius, at an event in Las Vegas. The car promises 10-percent gains in fuel efficiency, though actual figures – and even powertrain specifics – were not revealed. We estimate that could mean about 56 miles per gallon in city driving and 53 on the highway.

Chevy Tahoe-to-K5 Blazer conversion shop renders Jimmy option

Back in 2019 we told you about a truck that looked like a K5 Chevy Blazer, but was actually a modern late-model Tahoe underneath. It was the product of Arkansas shop Flat Out Autos, which reskinned modern GM full-size SUVs to look like their predecessors. Now, the same shop is planning to release a GMC version, converting Yukons to Jimmys. We were impressed by Flat Out's workmanship, beautifully blending the lines of the Blazer into those of the Tahoe. The result was a cohesive design, not just a panel swap. It clearly required a lot of work, which helped justify the $69,000 price tag, not including the cost of the donor Tahoe. FlatOut Autos GMC Blazer Tahoe reskin 01 View 11 Photos At least one new owner was so impressed that they recently purchased four identical Blazer conversions at once. The quadruplets were all finished in blue with a white roof and all based on brand-new 2020 Tahoes. Obviously, with such demand it was only natural for Flat Out to explore other options. On Facebook the company said it was working on a 1972 version with an eggcrate grille. Now, they've also released a rendering paying homage to the K5 GMC Jimmy. The Jimmy conversion uses the original's quad-headlight face, crosshair grille and GMC badging. Like the Blazer conversion, it adds chrome bumpers and milled door handles while adapting the original's 2-door design to the new truck's 4-door body. The rendering only shows the front three-quarter view, but presumably a new carbon fiber rear door would have to be created as the Blazer's says "Chevrolet" across the back. Flat Out says that all the modern conveniences found on the donor Tahoe will work on the conversion, including parking, blind spot and lane keeping sensors. If you have the coin, it's a great way to have retro style without giving up modern safety and performance. The new Blazer has been disappointing to many fans that had hoped for a Bronco-like SUV. Instead, GM gave us a crossover. The Flat Out conversions might be a good compromise, and expanding it to the GMC brand only makes sense. Obviously there's no requirement to use a GMC Yukon as the donor vehicle for the Jimmy, as it's functionally identical to a Tahoe, but wouldn't you want to keep it in the family? Related Video: