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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).

1 in 7 Americans say they might buy an EV next, as sales of electrics surge

About one in seven driving Americans may likely purchase an electric vehicle as their next car, according to an AAA poll, meaning that as many as 30 million Americans may pony up for an EV within the next three to five years. While some of the motivation is environmental, survey recipients say that lower maintenance expenses and solo access to high-occupancy-vehicle lanes are also among the factors behind potentially going electric. Take a look at the AAA press release on the study here. The poll indicates that about as many people are planning to buy an EV for their next car as are looking to buy a pickup, which is impressive given that the best-selling US vehicle is the Ford F-150. And things should only improve, as about 20 percent of millennials polled said that their next car would probably be an EV. The results are all the more encouraging, at least among green-car advocates, because gas prices have fallen about 40 percent within the past five years, meaning that there's less of an incentive to go electric from a purely economic perspective. Through the first quarter of this year, US plug-in vehicle sales were up about 63 percent from a year earlier to about 39,000 vehicles. Meanwhile, when it came to AAA's annual green-vehicle awards for this year, Tesla's Model S and Model X took the large car and SUV categories, respectively, while the Chevrolet Bolt and Volkswagen e-Golf were listed atop the subcompact and compact lists. The Lexus GS 450h hybrid and the Ford F-150 took home AAA's best green vehicle in the midsize and pickup truck categories. Related Video:

Leno drives Ringbrothers' latest, 1966 Chevy Chevelle Recoil

Jay Leno has been checking out quite a few older rides in his garage as of late, but has mixed things up a little this week. Ringbrothers took home an award at the 2014 SEMA Show for the 1966 Chevrolet Chevelle it named Recoil, and now the car has proven it can do more than just look good on Jay Leno's Garage. While the latest guest might look vintage, underneath those classic lines is a thoroughly modern muscle car sporting a claimed 980 horsepower. The heart of this beast is a supercharged LS7 V8 from Wegner Motorsports and a six-speed Tremec manual gearbox. Even with so much power, it can still run on 91-octane pump gas, and when Jay gets on the throttle the result is a wall of sound from the wailing supercharger. Despite the muscle, the Recoil doesn't really scream about its performance aesthetically. The color is a surprisingly plain beige, but the carbon fiber touches and side exhaust certainly indicate that there's something special here. The owner's sole request for the car was to include metal seats, and Ringbrothers provided them with a few bits of leather offering a touch of comfort. After checking the Recoil out from stem to stern, Leno finally gets behind the wheel and treats our ears to pull after pull from that big, supercharged V8.