2024 Gmc Sierra 2500 4wd Crew Cab Standard Bed Denali Ultimate on 2040-cars

Auto blog

'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).

2020 GMC Acadia AT4 priced just a little more than the SLT trim

Cars Direct has seen the order guide pricing the 2020 Acadia AT4 at $42,495 after destination; that means a $41,300 MSRP plus $1,195 for shipping and handling. GMC has left a lot of pricing room between the rugged, all-wheel drive AT4 and the dressed-up, top-shelf Acadia Denali with AWD, the latter costing $49,495, a $7,000 difference. The spread's blown out some by what appears to be an $800 increase for the 2020 Acadia Denali with all-wheel drive. The 2019 model costs $48,695. On the other hand, it looks like the 200 Acadia SLT trim has gone down in price. Cars Direct says that model will run $41,995, which is $300 less than the 2019 version that goes for $42,295 after destination. The new price leaves a $500 gap between the SLT-1 model with all-wheel drive and the AT4 trim, a figure that's a no-brainer to justify for any buyers trying to get a more butch curb appeal.     The Acadia AT4 package comes standard with all-wheel drive and the 3.6-liter V6 with 310 horsepower and 271 pound-feet of torque, puts black chrome on the grille, and nabs a set of exclusive 17-inch wheels on all-terrain tires. The other two engines in the lineup are a new turbocharged 2.0-liter four-cylinder with 230 horsepower and 258 pound-feet of torque, and cylinder deactivation. That motor will be the standard kit on the SLT and Denali trim levels, supplanting the 3.6-liter that's standard on the 2019 models. The entry-level engine carries over, a naturally aspirated 2.5-liter four-cylinder making 193 horsepower and 188 pound-feet of torque.

Surprise! GM putting aluminum in next-gen pickups

Last month, General Motors launched a series of ads touting the benefits of steel over aluminum – specifically, with regard to the Chevy Silverado versus the Ford F-150. (Kind of. We're not sure what a grizzly bear has to do with anything.) We took issue with the ads, with editor in chief Mike Austin saying they "reek of insecurity, and distract from the Silverado's strengths that could be used for positive advertising." But what bothers us more, is that yet another report surfaced claiming anti-aluminum GM will indeed use the weight-saving material in its next-generation fullsize trucks. On Tuesday, GM announced a $877-million investment for its truck plant in Flint, MI. But Reuters says that huge overhaul is because the trucks will use "substantially different equipment than the tools GM uses today." The report specifically states, "People familiar with the company's plans say GM's next-generation pickups and SUVs will make use of various materials, including aluminum and lightweight steel, to shed weight and gain fuel efficiency to meet tougher federal standards." The Silverado already uses a few aluminum components in the engine and hood, and if more widespread use will help GM build its best fullsize trucks ever, then that's great. Honestly, we have no reason to doubt that aluminum will be used in the next Silverado and GMC Sierra. We just hope GM remembers that nothing is ever truly deleted from the bowels of the Internet when it launches the subsequent "look how great aluminum is!" campaign. Related Video: News Source: Reuters Green Plants/Manufacturing Chevrolet GM GMC Truck aluminum steel