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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).

Seized drug dealer's Corvette Z06 joins Texas police fleet

A police department in Texas caused a stir after they posted pictures of their hot new ride on social media last week. This 2007 Corvette Z06 with dark-tinted windows once belonged to a drug dealer, but was seized in a DEA raid. The feds awarded the Corvette to the New Braunfels Police Department for their help in bringing down the drug distribution ring in the area. When police posted images of the car on their Facebook page, some followers were angry that tax dollars were spent on such an extravagant car. New Braunfels PD were quick to defend themselves. "To be clear, this vehicle was awarded to NBPD as part of an asset distribution from the Federal DEA criminal case of a large drug distribution ring in our area," the New Braunfels PD wrote on their Facebook page. "NBPD was instrumental in helping bring down that drug enterprise. Property seized during the course of an investigation is only awarded to the law enforcement agency after a court has determined that the suspect was involved in criminal activity and the proceeds (money) from that activity (i.e dealing drugs) paid for the items seized. Therefore, no property is given to a law enforcement agency prior to the investigation being completed and tried in a court of law." With a 505 horsepower V8 engine this murdered-out Corvette could outrun most speeders and getaway drivers. As is often the case in instances such as this, however, the 'Vette will be used in community outreach programs rather than as an active-duty cruiser. The department is currently holding a contest asking kids between 8 and 16 years old to find a name for the sports car. Currently, the most liked name is 'Optimus Crime'. A final winner will be chosen by the department on September 22. The kid who picks the name will earn bragging rights, plus a ride in the Corvette when its unveiled at the Comal County Fair Parade this weekend. Related Video:

Read This: Auto Extremist advocates for Corvette as brand with multiple models [w/poll]

The 2014 Chevrolet Corvette really grinds Peter De Lorenzo's gears. Or, more accurately, the self-anointed Auto Extremist has an issue with what he sees as mismanagement of the legendary sports car by General Motors executives. In a new editorial on his website, De Lorenzo argues it's time to split Corvette off from Chevrolet to create an all-new brand, complete with a model range with at least three new takes on the sports car. Capable of fully leveraging the successes of the Corvette Racing program and brandishing the full might of GM's technical prowess, the Corvette brand would theoretically give Porsche something to sweat over.
Sure, that sounds like a party, but given GM's troubled track record when it comes to launching (let alone managing) brands, we say that's slippery slope that could just as easily end with the whole Corvette franchise in the scrap bin. Either way, the notion is certainly an interesting one. Head over to Auto Extremist to take in the full editorial, and then let us know what you think in Comments. Should GM split off its most storied nameplate?
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