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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).

Chevy, Lincoln dealers say they still want sedans

Detroit automakers have famously turned their backs on sedans as they make the strategic bet to double down on money-making trucks and SUVs, but dealers for at least two American brands are giving the companies contrary signals. In separate recent interviews with leading national dealer councils for Chevrolet and Lincoln, Automotive News reports that both brands’ dealers still see a need for cars. The publication published a Q&A interview with Mike Bowsher, chairman of the Chevrolet National Dealer Council, who said Chevy dealers managed to hold onto market share last year despite the phase-out of the Cruze compact sedan and hatchback, thanks to products like the Spark and Sonic subcompacts and the Trax and Equinox crossovers. But, he acknowledged, “We do feel like we could use a car, especially in the low-MSRP range.” The comments follow similar recent comments from Tom Lynch, who chairs the Lincoln National Dealer Council. He told AN, “If weÂ’re not in segments where there is still a good amount of business, I think the company and the dealers lose out.” The Cruze was one of the victims of GMÂ’s November 2018 announcement of plant closures, with production having ceased with the closure of GMÂ’s Lordstown, Ohio assembly plant last year. GM sold 47,975 Cruzes in 2019 but a healthy 142,617 in 2018. At Lincoln, Lynch said the council has been telling the company it needs to stick with the sedan segment, despite plans to kill the MKZ sedan in the coming months and unconfirmed reports that the Continental isnÂ’t long for this world, either, despite the buzz of the suicide-door Coach Door Edition, shown in the photo above. Lincoln sold 17,725 MKZs and 6,586 Continental sedans in 2019, down a combined 15%, but still good for almost 22% of overall Lincoln sales. It's worth noting that Lincoln competes in a luxury segment that still expresses allegiance to four- and two-door cars. Even Cadillac, its cross-town rival, is staying active with the upcoming CT5 and CT4 sedans. Lynch pointed to Tesla as evidence that strong sedan products can resonate with consumers, though he conceded that “What that looks like for Lincoln going forward, IÂ’m not sure of.” For now, anyway, Chevy still offers the Sonic and Spark subcompacts, the latter of which saw sales climb 32.5% in 2019 to 31,281 (Sonic sales fell nearly as steeply).

2014 Chevy Cruze Diesel arrives with 42 mpg for $25,695*

The last time General Motors had a diesel passenger car in the US, it was the 1.8-liter 1986 Chevette. At the 2013 Chicago Auto Show today, GM is unveiling the much-anticipated 2014 Chevrolet Cruze Diesel. The compact bows with a 2.0-liter turbo-diesel four-cylinder engine that boasts 148 horsepower and 258 pound-feet of torque, with full twist coming on at just 2,000 rpm. What's more, the common-rail, direct-injection diesel features an overboost function that allows the engine to deliver up to 280 lb-ft of torque for 10 seconds at a time. Even with 10 more horsepower and 110 more pound-feet of torque than the available turbocharged 1.4-liter four-cylinder in the Cruze, the 2.0-liter diesel engine can return up to 42 mpg (highway) bolted to its six-speed automatic transmission.
If you're counting, that figure meets the less powerful Cruze Eco with a six-speed manual transmission. More importantly, the auto transmission Cruze Diesel matches its main competition, the Volkswagen Jetta TDI, in highway fuel economy. The Cruze 2.0 TD (as it will be badged) can also handle up to 20 percent biodiesel (B20), whereas the Jetta is rated only for B5. General Motors has not released city fuel economy for its newest diesel, but we do know how much it will cost you to jump behind the driver's seat.
GM will kindly ask for $25,695, plus an $810 destination fee. That marks a $2,115 premium over a loaded Cruze LTZ Auto and $2,640 more than the Jetta TDI, though the MSRP will net you a leather interior, 17-inch alloy wheels and an Aero Performance Package, as well as a two-year maintenance plan and five-year, 100,000-mile powertrain warranty. Compared to the gas-powered Cruze, you also lose a couple cubic feet of rear cargo space thanks to a 17-liter diesel emission fluid tank. That urea fluid, which helps put the clean in clean diesel, will need to be refilled at least every 10,000 miles.