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Submit your questions for Autoblog Podcast #313 LIVE!

We record Autoblog Podcast #313 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #313
2014 Chevrolet Silverado and GMC Sierra introduced

'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).

2015 GMC Canyon Nightfall Edition rumbles in under the radar

Buyers enticed by the new 2015 GMC Canyon will want to take a look at the new Nightfall Edition. Unveiled here on the floor of the 2015 Detroit Auto Show, the Nightfall is based on the mid-level SLE trim level in four-door crew cab bodystyle, but upgrades with a stealthy appearance and bundled extras. It's decked out in Onyx Black paint, for starters, but also has a blacked-out grille and side steps, a spray-in bedliner and 18-inch wheels with darkened inserts, as well as a polished exhaust tip, remote start and automatic climate control fitted as standard. The only choice left up to the buyer of this murdered-out mid-size pickup is whether to get it in 2WD or 4WD. Either way, motivation is provided by the Canyon's 3.6-liter V6 with its 305 horsepower and 269 pound-feet of torque. Pricing has yet to be announced, but considering that the SLE on which it's based starts at $30,980 and that the SLT comes in at $34,345, we'd expect the Nightfall to be positioned in the low 30s, with another few grand for four-wheel drive. Featured Gallery 2015 GMC Canyon Nightfall: Detroit View 13 Photos Image Credit: Live photos copyright 2015 Drew Phillips / AOL Detroit Auto Show GMC Truck Detroit 2015 Detroit Auto Show gmc canyon