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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).

GM recalls Cadillac ATS and Chevy Impala for separate issues

The National Highway Traffic Safety Administration added two recalls from General Motors in the government organization's daily update of safety campaigns. Both were for failing to meet Federal Motor Vehicle Safety Standards but for completely separate reasons. The larger recall covers 58,698 units of the 2013-2015 Cadillac ATS, but it doesn't really carry huge safety concerns. In vehicles produced between April 25, 2012, and February 9, 2015, the controls for the tilt and slide of the moonroof are not recessed enough, as required by federal law. According to NHTSA, it's possible that someone could inadvertently activate the auto-close for the roof panel, which the agency claims increases "the risk of personal injury." Dealers will install a new trim plate that will add the necessary clearance. The other campaign covers 1,177 examples of the 2014 Chevrolet Impala from between November 15, 2012, and May 27, 2014. However, this is actually a repeat of a previous recall on the Chevy and the Cadillac XTS from 2014. The affected Impalas here "were remedied incorrectly" under the earlier campaign, according to NHTSA. On these sedans, it's possible the electronic parking brake might not fully disengage and still remain in some contact with the rotor, which is in violation of federal rules. The fault can cause excessive heat from the brakes that could potentially lead to a fire, according to NHTSA. To fix the problem, dealers will reprogram the electronic parking brake control module. Show full PR text RECALL Subject : Inadvertent Press of Roof Panel Switch/FMVSS 118 Report Receipt Date: FEB 24, 2015 NHTSA Campaign Number: 15V106000 Component(s): VISIBILITY Potential Number of Units Affected: 58,698 All Products Associated with this Recall Vehicle Make Model Model Year(s) CADILLAC ATS 2013-2015 Details Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2013-2015 Cadillac ATS vehicles manufactured April 25, 2012, to February 9, 2015. In the affected vehicles, the power-operated roof panels auto-close when the non-recessed "Slide" or "Tilt" switches are pressed. As such, these vehicles fail to comply with the requirements of the Federal Motor Vehicle Safety Standards (FMVSS) No.

Mysterious white powder discovered at GM Orion Assembly

Workers at General Motors Orion Assembly Plant in Orion Township, MI uncovered a mysterious white powder in two different parts of the factory earlier this week, raising concerns about worker safety. "We can confirm that an unknown substance (white powder) was found on the floor outside of Gate 6 at Orion Assembly on Monday, August 29. On Tuesday, August 30, we had a second report of a bottle containing a similar substance found inside the plant," GM spokesperson Dayna Hart told The Oakland Press via email. GM stressed that incident didn't disrupt operations at the plant, and that the company was taking steps to ensure the safety of the sprawling factory's workers. That did include, an anonymous worker told The Oakland Press, closing off parts of the factory for two full days, as drug-sniffing dogs and crews in haz-mat suits descended on the area. "A sample of the substance has been sent to a laboratory for identification and results are expected later this week," Hart said. "All findings and actions have been shared with our employees." Orion Assembly currently builds the Chevrolet Sonic and Buick Verano, and will eventually be responsible for production of the new, all-electric Chevy Bolt early next year. Related Video: