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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).

2015 Chevy Colorado and GMC Canyon order guides reveal added power

General Motors' Fleet Order Guide system is often the canary in the coal mine for interesting changes on new models. The recent guide for the 2015 Corvette unveiled all sorts of changes that weren't yet known about the sports car. Now, it's time for the 2015 Chevrolet Colorado and GMC Canyon to take their bow in the spotlight, and they look worth the wait. The new midsize trucks are getting a touch more power than first thought, as well as some very nice features.
Extended Cab models of both trucks come standard with a 2.5-liter, direct-injected four-cylinder rated at 200 horsepower at 6,300 rpm and 191 pound-feet of torque at 4,400 rpm. That's a bit more than the 193 hp and 184 lb-ft originally reported for the duo. The standard transmission for the extended trucks is a six-speed manual, but the Work Truck trim is also available with an optional six-speed automatic. Towing for the four-cylinder is rated at 3,500 pounds.
Crew Cab models come standard with a 3.6-liter V6 with 305 hp at 6,800 rpm and 269 lb-ft of torque at 4,300 rpm, with a six-speed automatic. That's also somewhat different than the originally reported rating of 302 hp and 270 lb-ft. Towing for the V6 is rated at 7,000 pounds.

GM is quietly slashing prices on base models

While General Motors' fourth quarter financial figures haven't yet been released, the automaker seems to be weathering a potentially rocky time well, even beating third-quarter projections last year. To keep the climb going, the company is launching new base trims for several popular models that make them cheaper than ever but with tight dealer margins. The new entry-level trims are the Chevrolet Cruze L, Equinox L, GMC Terrain SL and Buick LaCrosse 1SV. Buyers lose some content by picking them, but the prices are slashed. According to Cars Direct, the biggest savings are on the LaCrosse, where customers pay $31,065, plus $925 destination, $2,570 less than the previous base 1SB trim but must accept things like 17-inch wheels and no cargo net in the back. If you're wondering how Buick can remove only a little equipment but cut the price so much, it's because the company also slashed dealer margins. According to Cars Direct, the difference between the invoice and MSRP for the LaCrosse 1SV is only around $150, compared to around $1,350 before. The disparity is even greater for the Cruze with an $81 difference in the prices, compared to about $600 for the LS version. Showrooms are expected to keep very low stocks of these trims, though. "Dealers use such vehicles to get people in the door, but they do not generally want to do high volumes of these strippers. The margins are next to nothing; they don't make much money off these cars," said Ed Kim, Vice President of Industry Analysis for AutoPacific to Autoblog. Dealers are also expected to advertise that these new base trims undercut major competitors. For example, the Cruze L rings up for about $2,320 less than a Honda Civic LX, according to Cars Direct. One potential drawback for buyers is that these models might not be eligible for incentives. While the attractive prices might get customers into dealers, folks may not actually end up driving home with these entry-level models. Kim indicated base trims also make up a small portion of the sales mix. "Consumers aren't asking for stripped out vehicles, even at the low end of the marketplace," he said. Featured Gallery 2015 Chevrolet Cruze View 9 Photos News Source: Cars DirectImage Credit: Chevrolet Buick Chevrolet GM GMC Car Buying Car Dealers Crossover Sedan gmc terrain cheap cars