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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).

Recharge Wrap-up: Chevy teases Bolt driving range, China pursues EV subsidy cheaters

Chevy is teasing the Bolt's driving range, which it is set to reveal on Tuesday. It will certainly be able to travel more than 200 miles between charges, but the second and third digits in that value, as it stands today, are still question marks. On its Facebook page, Chevrolet is asking fans to try to guess the official range. Of course, Tesla fans have already started posting their own snide remarks in the comments. Chevy fans are certainly hoping to see the Bolt's range eclipse that of Tesla's upcoming Model 3, which the California-based automaker puts at 215 miles. See Chevy's post on Facebook to make your own guess, or check back there (or here at AutoblogGreen) for the official number once it is unveiled. Fuel cell company PowerCell Sweden says it has signed an agreement with a Chinese company to make range extenders for commercial trucks. The unnamed Chinese customer has placed an order and signed a memorandum of understanding with PowerCell Sweden, and the partners will develop methanol reformer fuel cell range extenders for electric distribution trucks. "Our unique expertise in fuel cells and reformer technology is receiving an increasing attention worldwide and we are truly pleased to get another Chinese order," says PowerCell Sweden Sales Director Andreas Boden. Read more at Green Car Congress, or from PowerCell. China is accusing major automakers of violating EV subsidy rules. After the country's Ministry of Finance penalized five companies with fines and, in one case, revocation of production license for subsidy cheats, China has since named 20 more potential violators, including Nissan, Hyundai, JAC, and a subsidiary of BYD. Of the first five companies to be punished under the investigation, Suzhou Gemsea Coach Manufacturing is having its production license revoked, while four others, including a subsidiary of Chery, are being fined for about half of the subsidies received. The scandal is bad new for China's subsidy program, which has helped spur sales of plug-in vehicles. Read more from Fortune, or at Hybrid Cars.

Chevy to show redesigned Captiva in Geneva, will it come to US rental lots?

Unless you're renting a car or driving through Orlando, Florida (the rental car capital of the US), you'll probably never see a Chevrolet Captiva - the rebadged, fleet-only version of the old Saturn Vue - on our roads, but this crossover is popular in many other parts of the world. As such, Chevrolet announced that the Captiva will be getting an update for 2013, which will be unveiled next week at the Geneva Motor Show.
Coming off a pretty extensive refresh in 2011, the 2013 model year will bring even more changes to the Captiva like LED taillights, new 18-inch wheels and revised fascias with a new grille and fog lights up front and inset chrome exhaust outlets at the rear. New interior features include heated rear seats, dual-zone climate control as well as available options on some of the upper trim levels such as leather seating and keyless entry and start. We have yet to hear back from Chevrolet as to whether or not the updated Captiva will be making its way to a rental lot near you, as the model is only available in the US to fleet buyers.
Alongside the updated Captiva, Chevy is also showing off its new Trax in Europe, where the subcompact crossover will go on sale this spring. GM's press release for these two Geneva-bound models is posted below.