Gmc Sierra 2500 Denali on 2040-cars

Auto blog

'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).

Which of these high-powered pickup classics would you choose?

High-performance pickups would appear to be having a moment on the auction site Bring a Trailer, with two tempting examples up for auction right now: a 1971 Ford Ranchero GT and a 1991 GMC Syclone. These trucks are a generation apart, but they each represent the peak muscle truck of their time. The Ranchero, of course, was Ford's car-based pickup, and Ford took advantage of its Torino roots by offering the same ultra-high-performance 429 Cobra Jet V8 in the Ranchero as it did in the Torino-branded coupes and convertibles. The 429 V8 in this truck is said to be numbers-matching, and it looks the business topped with an air scoop poking through the hood. It's paired with a three-speed automatic and a limited slip differential, reportedly one of only 82 1971-model Rancheros with this powertrain combo. As a Ranchero GT, this example sports hidden headlights, and the dual sport mirrors and vinyl top further establish its kinship with its passenger-car siblings. A set of factory Magnum 500 wheels and a respray in the original red add to the muscle-truck vibe. Two decades later, car-based pickups were dead, so when GMC decided to revive the muscle-truck genre it did so with the mid-size Sonoma. The resulting Syclone put a more modern spin on the fast-pickup idea (and on the spelling of "cyclone"). This hi-po hauler uses a 4.3-liter V6 topped with a Mitsubishi turbocharger that helped it make 280 horsepower. It's mated to a floor-shifted four-speed automatic and a Borg-Warner all-wheel-drive system with a 35/65 torque split. The Syclone was a one-year-only model, of which just under 3,000 were built. All were black with matching cloth seats with red accents. The only other '71 Ranchero to appear on BaT was a non-original GT with a 351ci V8 that was a no-sale at $7,900. This Ranchero is already nearly double that figure. Of the four previously Syclones that have crossed BaT's virtual auction block, two have sold, for $36,000 and $50,000, but both had lower miles than this truck. At this writing, these two trucks are neck-and-neck, both in the mid teens with both auctions set to end April 23. Which powerhouse pickup makes you want to put your money down? Featured Gallery Ford Ranchero and GMC Syclone Ford GMC Truck Classics

2015 Chevy Silverado, GMC Sierra recalled for steering issues

DETROIT — General Motors Co is recalling more than 1 million pickup trucks and sport utility vehicles in the United States due to issues with a temporary loss of power steering, the National Highway Traffic Safety Administration said. The recall is for 2015 models. They are: the Chevy Silverado 1500, Suburban and Tahoe, GMC Sierra 1500, Yukon and Yukon XL and Cadillac Escalade. The problem may cause difficulty steering the vehicle, especially at low speeds, increasing the risk of a crash, the auto safety regulator said in a document dated Sept. 12. The document did not highlight any reports of accidents and injuries, because of the power steering issue. GM dealers will update the power steering module software, free of charge for owners of the affected vehicles. In 2014, the No.1 U.S. automaker had recalled nearly 800,000 pickup trucks worldwide because of the same problem. GM did not immediately respond to a request for comment.Related Video: