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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).

2014 Chevrolet Cruze TD fires up its new diesel motor

Ever since General Motors confirmed plans to produce a diesel-powered Cruze back in 2011, we've been eagerly awaiting its arrival. And as part of the 2013 Chicago Auto Show, Chevrolet has pulled back the cover on its oil-burning compact sedan, set to go on sale in the near future with a starting price of $25,695, not including $810 for destination.
The heart and soul of the Cruze TD (that's its official name) is a 2.0-liter turbo-diesel inline four-cylinder engine rated at 148 horsepower and 258 pound-feet of torque, mated solely to a six-speed automatic transmission. The engine also has an overboost function that will increase torque to 280 lb-ft for up to ten seconds. The full brace of official specs haven't been released, but GM tells us that highway fuel economy will come in at 42 miles per gallon. If that number sounds familiar, it's because the Volkswagen Jetta TDI has the exact same rating. Unlike the Jetta, however, the Cruze TD can run on B20 biodiesel, where as the Volkswagen can only accept B5.
Model-specific changes to this 2014 Cruze TD include an aero kit and unique 17-inch alloy wheels. Inside, there's a full leather interior, and Chevrolet will provide two years of complimentary scheduled maintenance, not to mention a 100,000-mile powertrain warranty.

GM program sees dealers taking on way more loaner cars

Given the volume of vehicles we're talking about, this is a significant development for GM's bottom line. Bring your car into the dealership for service, and you may need a loaner car in exchange. And with so many recalls being carried out, that means a lot of loaners – especially at General Motors dealerships. That could be one of the reasons why GM is massively expanding its loaner fleet program. While many Chevrolet and Buick-GMC dealerships have an on-site rental car location operated by a third party like Enterprise (which may or may not provide a GM vehicle), others manage their own loaner fleets. But while the range of dealerships operating such fleets was once small, reports Automotive News, the number has been growing rapidly: from the locations responsible for only 20 percent of those brands' sales two years ago to about 90 percent today. The impetus for that growth comes down to a massive expansion of GM's Courtesy Transportation Program. The initiative encourages dealers to ramp up their loaner fleet to a maximum size determined by GM, with a mix determined by the dealer itself, so that a showroom in Texas can be bolstered with a fleet of pickup trucks and a dealer in California can employ more Volt and Camaro Convertible loaners. The dealership gets a $500 credit for each vehicle its puts in its fleet, and can use those vehicles as loaners for service customers, as multi-day test drivers or to rent out separately. The vehicles remain in the dealer's fleet for 90 days or 7,500 miles, then they can be sold as used, but with new-car incentives. The dealer gets a fleet of loaners, customers get to use the loaners, try out a new car overnight or buy a barely used car with attractive incentives, and GM gets to clock more sales. But therein lies the kicker: the automaker counts the dispatch of the loaner new vehicle to the dealership as a new-car sale, which could end up distorting its sales figures. Counting loaner vehicles as sold vehicles is something of an industry-standard practice, but given the volume of vehicles we're talking about, this is a significant development for GM's bottom line. One dealership - Paddock Chevrolet in Kenmore, NY, for example - had no loaner fleet two years ago, but now runs a fleet of 50 vehicles. Multiply that by the 4,000 or so dealers GM has across America and you're talking about the potential for hundreds of thousands of these sorts of sales.