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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).

2023 Grand National Roadster Show Mega Photo Gallery | Hot rod heaven

POMONA, Calif. — From an outsider's perspective, it would be easy to assume that the Grand National Roadster Show has always been a Southern California institution. After all, it celebrates the diverse postwar car culture of the region — hot rods, lead sleds, lowriders, and more. However, the show had its roots in NorCal in 1950 when Al Slonaker and his hot rod club showed their custom cars at the Oakland Expo. The GNRS moved to Pomona, California, in 2004. By then it had grown exponentially and seen about a dozen more car customization trends come and go. However, the show and its centerpiece award, the America's Most Beautiful Roadster prize, celebrate what is perhaps the first of those trends: the American hot rod in its purest form. Today, in its 73rd year, the GNRS is the oldest indoor car show in America. Annually it welcomes 500-800 cars, gathered into special themes like Tri-Five Chevys or Volkswagen Bugs. At this year's show, which was last weekend, a special hall was dedicated to pickup trucks built between 1948-98, including mini-trucks, groovy camper bed conversions, and resto-mods.  However, of all the vehicles presented, only nine are eligible for the America's Most Beautiful Roadster award. Winners get their names engraved on a 9-foot-tall perpetual trophy that was, according to The Ultimate Hot Rod Dictionary, the largest in the world when it debuted in 1950. Slonaker chose the word "roadster" initially because "hot rod" bore slightly negative outlaw connotations in 1950. Only American cars built before 1937 of certain body styles — roadsters, roadster pickups, phaetons, touring cars — are eligible, and they cannot have roll-down side windows.  Cars in the running for the cup cannot have been shown anywhere else before their debut at the GNRS.  Contestants for this accolade essentially build their cars to the a platonic ideal of a hot rod. This year the honors went to Jack Chisenhall of San Antonio, Texas, for his "Champ Deuce," a 1932 Ford Roadster. It's exactly what you picture when you think of a hot rod, but distilled to its absolute essence.  Other standouts included "Green Eyes," a two-tone green 1959 Chevy El Camino  with a heavily metal-flaked bed, "Blue Monday," a 1964 Buick Riviera lowrider, and a personal favorite, "Purple Reign," a purple and black 1951 Mercury. Cars may have started out as tools, but there aren't shows like this filled with custom refrigerators.

2014 Chevy Silverado High Country spied wearing trappings of new luxury trim

Spy photographers have spotted the new Chevrolet Silverado High Country and GMC Sierra Denali out on public streets for a little testing. From the looks of things, the Silverado will receive a much-differentiated front fascia along with special badges and those honking 20-inch chrome wheels. Expect to find a more posh interior as well. Likewise, the Sierra Denali will wear a tweaked nose with the familiar Denali bling. The one of the GMC trucks spotted here rolls on 21-inch gunmetal wheels instead of the 20-inch chrome pieces of the High Country.
Word has it both trucks will go on sale after the Texas State Fair this summer. While General Motors hasn't said for certain what we can expect to find under the hood, we'd be surprised to see anything outside of the range of engines found in the standard Silverado and Sierra models. That means buyers should be able to get their hands on the efficient, 23-miles per gallon 5.3-liter V8.