Flex Fuel Navigation Fully Loaded Chrome Package Priced To Sell 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).

2021 Chevy Silverado, GMC Sierra fuel economy to go down due to global chip shortage

Production of the 2021 Chevy Silverado and 2021 GMC Sierra is continuing, but the global semiconductor chip shortage is resulting in a mid-year change. Or rather, an omission.  Basically, the availability of cylinder deactivation for the 5.3-liter V8 will be significantly reduced, resulting in a reduction of 1 mpg combined for affected models. This applies whether that engine has the six- or eight-speed automatic, as well as to both the regular Active Fuel Management and the more advanced Dynamic Fuel Management cylinder deactivation systems. DFM does remain with the pairing of 5.3-liter V8 and 10-speed automatic that comes standard on the LT Trail Boss and High Country. "Due to the micro controller shortage, the components that control AFM/DFM in the engine control module (ECM) have been removed," GM spokesperson Michelle Malcho told Autoblog. She also indicated that the engines will still have the AFM/DFM hardware in place, but that GM will not allow activation of the systems in the future with an ECM change.  Malcho also confirmed to Autoblog that the Silverado and Sierra's other engines will continue to have AFM and DFM, including the 2.7-liter turbo inline-four, 4.3-liter V6 and 6.2-liter V8. In an earlier statement to Reuters, she declined to say the volume of vehicles affected. "By taking this measure, we are better able to meet the strong customer and dealer demand for our full-size trucks as the industry continues to rebound and strengthen," Malcho wrote Reuters in an email. The change runs through the 2021 model year, she said. Malcho told Reuters it would not have a major impact on the Detroit automaker's U.S. corporate average fuel economy (CAFE) numbers. "We routinely monitor our fleet for compliance in the U.S. and Canada, and we balance our portfolio in a way that enables us to manage unforeseeable circumstances like this without compromising our overall (greenhouse gas) and fuel economy compliance," she said. GM's fleetwide fuel economy in the 2018 model year was 22.5 miles per gallon and was projected to rise to 22.8 mpg for 2019, according to a report by the Environmental Protection Agency. To meet federal CAFE requirements, automakers like GM often use credits from either earlier years where they faced less stringent rules and performed better than the requirements or buy credits from other automakers. GM said last month the chip shortage could shave up to $2 billion from this year's earnings.

Will GMC enter the subcompact crossover segment after all?

GMC last year categorically ruled out launching a subcompact crossover positioned below the Terrain, but the decade-old rumor refuses to die. The on-again, off-again model is back on track for production, according to a recent report. Citing anonymous sources, enthusiast website GM Authority claims the soft-roader is closer than ever to receiving the proverbial green light for production. It hasn't been approved yet, so development work hasn't started. What it will look like if it receives a thumbs-up from executives is up in the air, but GMC can take several paths into this lucrative (and increasingly popular) segment of America's new-car market. Chevrolet has two fighters in the ring: the Trailblazer and the Trax. GMC could feasibly choose one, put it in a brand-specific wrapper, and call it a day. It could also design its entry from scratch, though this option would take longer and cost significantly more. Either way, the model will allegedly be called Granite or Graphyte, and it will be positioned below the Terrain in terms of size and price, meaning it would likely start above $20,000. In 2019, GMC explained it ruled out expanding its range towards the bottom to position itself as a premium brand. It wanted to focus on high-profit models, like the Sierra and the Canyon, but the crossover's ever-increasing popularity may have proven too alluring to resist. Besides, small and premium aren't mutually exclusive, and downsizing would help the brand increase its annual sales. If you're experiencing deja vu, it's likely because we've heard murmurs about a city-friendly GMC since the Granite concept (pictured) made its debut during the 2010 edition of the Detroit Auto Show. It was approved for production that year, approved again in 2011 (tentatively on a Cruze platform), and abruptly canceled in 2012. GMC hasn't commented on the report, so we'll need to be patient to find out if it's accurate — and how it would differentiate its entry-level crossover from Buick's. In the meantime, the company is putting the final touches on the electric Hummer, which will be offered as a pickup and as an SUV, and it's about to unveil the 2022 Sierra. Featured Gallery GMC Granite Concept Rumormill GMC Crossover