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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 applies for LT5, LTX trademarks... are new small block variants coming?

Recently discovered General Motors trademark applications for LT4, LT5, LT88 and LTX have observers wondering what kind of high-performance offerings could be on their way. A new LT4 would mark a return of the engine designation first used on the Corvette Grand Sport, SLP Pontiac Firehawk and SLP Chevrolet Camaro SS from 1996 and 1997. Supposition at Corvette Forum - which provided advance intel on the C7 like these leaked images - believes a new LT4 could go into the high-performance trim of the next-gen, 2015 Camaro that would be more powerful than the 580-horsepower Camaro ZL1.
Seeing an LT5 again would also be déjà vu - in its former life it was a 5.7-liter V8 for the C4 Corvette ZR-1 from 1990-1994 designed by Lotus, producing from 370 hp to 405 hp. A mix of rumor and hope is that the new LT5 will be a supercharged evolution of the 6.2-liter LT1 (pictured) placed in the new C7 Corvette, and that it will go into the C7 version of the ZR1 pumping out something like 700 hp.
The LTX trademark is, as with that last letter, a complete mystery. If the "X" isn't a generic way to denote the whole LT family, it's wondered if it LTX could refer to a crate motor offering like the LSX.

Domino's reveals Chevy Spark-based delivery car

Next time you order from Domino's Pizza, check out the delivery car. In an effort to get hot and fresh pizzas to hungry customers, the company is creating a small run of custom vehicles that are tailored for the job. Dubbed the Domino's Delivery Expert (DXP), these 2015 Chevrolet Spark-based hatchbacks pack a plethora of features to provide the perfect pie. When the DXP's on delivery duty, every order should arrive steaming hot thanks to the hatchback's biggest custom upgrade – a warming oven right behind the driver. Accessible from outside, it can keep pizzas at the perfect temperature on the way to your house and hold two of Domino's Heatwave bags. Other than the driver's seat, the rest of the interior also gets replaced with bountiful storage and non-slip surfaces. According to the company, as many as 80 pizzas could conceivably fit inside, and that would be quite a party. The exterior is still clearly derived from the Spark but with some clever additions. An illuminated "Out for Delivery" sign is on the roof, and a puddle light shoots the Domino's logo on the ground. Plus, the company's red-and-blue color scheme is emblazoned over the hood, pillars, and hatch. Underneath all the pizza-related mods, power comes from a 1.2-liter four-cylinder and CVT. Rather than just a one-off stunt, Domino's is working with Roush Enterprises and former General Motors exec Kenneth R. Baker to build 100 DXPs. They're hitting the streets in 25 US cities, and you can check if your locale is included on the project's website. The seed of this idea came from a partnership with Local Motors to crowdsource the ultimate pizza delivery platform. Domino's Launches Purpose-Built Pizza Delivery Vehicle Domino's Innovative DXP™ Created by Three Great Michigan Brands and an International Crowdsourcing Design Competition Ann Arbor, Mich., Oct. 21, 2015 -- In its latest innovation as the recognized world leader in pizza delivery, Domino's (NYSE:DPZ) is launching the Domino's DXP™ (Delivery Expert), a specially designed and built pizza delivery vehicle. The DXP is the combined brainchild of former GM R&D executive Kenneth R. Baker, Michigan-based Roush Enterprises and Domino's. To also include consumers' input, hundreds of concepts were initially identified in an online crowdsourcing design competition hosted by Local Motors. "The Domino's DXP is the first purpose-built vehicle aimed at revolutionizing pizza delivery," said Russell Weiner, president of Domino's USA.