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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 recalling 15k midsize pickups over leaky brakes

General Motors has announced a recall in coordination with the National Highway Traffic Safety Administration related to the brakes on the 2015 Chevy Colorado and GMC Canyon. In the 14,838 units in the United States estimated to be affected, the front brake calipers may be leaking fluid. Needless to say, that could make them less effective, which could hinder the vehicle's ability to stop in time to avoid a collision. The affected units were all manufactured between January 6 and December 24, 2014. The fix seems simple and straightforward enough, with dealers being instructed to inspect the front brake calipers, and replace them if necessary. See below for all the details from NHTSA. RECALL Subject : Brake Fluid Leak Report Receipt Date: MAY 12, 2015 NHTSA Campaign Number: 15V278000 Component(s): SERVICE BRAKES, HYDRAULIC Potential Number of Units Affected: 14,838 Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2015 Chevrolet Colorado, and GMC Canyon trucks manufactured January 6, 2014, to December 24, 2014. The affected vehicles may experience the front brake calipers leaking brake fluid. This is due to air pockets, an imperfection in the metal caliper body. CONSEQUENCE: If the vehicle experiences a brake fluid leak it can increase the stopping distance, increasing the risk of a vehicle crash. REMEDY: GM will notify owners, and dealers will inspect and replace the front-brake calipers if necessary, free of charge. The recall is expected to begin July 10, 2015. Owners may contact GM customer service at 1-800-222-1020 (Chevrolet), or 1-800-462-8782 (GMC). GM's number for this recall is 14888. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov. Related Video: Featured Gallery 2015 Chevrolet Colorado: First Drive View 38 Photos News Source: National Highway Traffic Safety AdministrationImage Credit: Copyright 2015 Seyth Miersma / AOL Recalls Chevrolet GMC Truck gmc canyon brakes

GM: Without LG Chem, we couldn't build Bolt EV [UPDATE]

It's absolutely no surprise that General Motors has a thing for LG Corp. The Detroit automaker and the Korean parts supplier have been working in public on electric vehicles ever since it was announced that LG Chem would supply the battery cells for the Chevy Volt in 2009. LG Chem was even named GM's 2010 Supplier of the Year. But, yesterday, the connection between the two companies was strengthened with the announcement that LG Electronics would be supplying a number of components for the upcoming Chevy Bolt electric vehicle. The Bolt is expected to be able to go about 200 miles and will carry a price tag of about $30,000 (after incentives) when it arrives in 2017 or so. LG's new components can be found almost everywhere in the Bolt. They include the battery pack and the battery heater, a new motor, the power inverter module, the electric climate control system compressor, the on-board charger, high-power distribution module, the accessory power module, and power line communication module. Oh, and then there are LG Electronics' advanced display technologies like the new instrument cluster and a new infotainment cluster. LG Electronics also supplies parts for the 4G LTE OnStar system, just like it does in other new Chevys. If that all sounds like a lot of components to you, you're right. Mark Reuss, GM executive vice president of global product development, purchasing and supply chain, said that without the expanded relationship with LG, GM would not be able to bring the Bolt to market (insert old ironic quote link here). "I think GM was lacking that [electrification knowledge] in a very complete way for many years, I'll just be frank about that," Reuss said. "I also think that on an electrified basis, this requires a long-term commitment and trust that sometimes is violated on a more short-term, regular, traditional basis. I think we have found something completely different with LG and I think that has become a widely talked about and duplicated want from our purchasing and corporate standpoint with our supply base." The "this" that Reuss is talking about here is the OEM-supplier relationship, something has evolved with the LG-GM situation. Previously, the automaker-supplier relationship used to be more like a dictator telling underlings what he needed, Reuss said, and that was a bad idea. "Today's competitive landscape requires a different approach, especially in electrified vehicles," he said.