2015 Gmc Yukon Slt on 2040-cars

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GMC Syclone spools up a storm on Jay Leno's Garage

A storm was brewing on American roads in the early 1990s. That's when Detroit's automakers were producing some of the hottest performance trucks ever devised – models like the Ford Lightning, GMC Typhoon, and its flyweight pickup sibling, the GMC Syclone. Jay Leno just happens to have one of the latter in his garage, and took it out to showcase in this latest video segment. The Syclone was an exercise in absurdity, and could not only trounce any other pickup on the road, it could outrun anything else GM made and just about anything else on the road – beating Ferraris and Porsches off the line. In a pickup, for crying out loud. The kicker is that its engine wasn't such a monster, either: under the hood sat a 4.3-liter turbocharged V6 pumping out what would seem by today's standards to be an adequate 280 horsepower and 350 pound-feet of torque. Even the smaller of the EcoBoost V6s available in today's Ford F-150 produces more than that. But in a lightweight, compact pickup, those figures were enough to propel the Syclone to 60 in 4.3 seconds and run the quarter-mile in 13.6 seconds. Long before the dune-jumping Ford F-150 SVT Raptor or even the Viper-powered Dodge Ram SRT-10, GM made fewer than 3,000 Syclones based on the compact Sonoma (sister to the Chevy S-10) and another 4,700 of the Typhoon, which was mechanically similar but more practical (albeit heavier) wagon bodywork from the Jimmy. But as Jay aptly points out, the Syclone was the one you wanted. Scope it out in the ten-minute video clip above.

2023 GMC Yukon Denali Ultimate comes with more style, most everything else

First introduced on the Sierra line, the even more luxurious Denali Ultimate trim is coming to the 2023 GMC Yukon. It includes nearly every available feature for the regular Denali as standard, plus some unique design features. The Denali Ultimate is distinguished by its dark chrome grille and badging, features that cannot be added to any other Yukon model. It also gets the largest wheels yet for the Yukon: 22-inchers with painted, machined and polished sections. The interior is more impressive. Most of the surfaces are covered in leather, real wood and aluminum trim. The seat backs and the wood trim have topographical maps of Mount Denali. Metal badging is even added to the seat backs with the special trim level's name. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. As for features, the Denali Ultimate comes with basically everything that's standard as well as what's usually optional on the regular Denali including magnetic shocks, huge screens, an 18-speaker sound system and massaging seats, among others. So this is one of the rare times where it actually is easier to list what's either an additional feature or just a preference. Naturally you get a choice of colors, and the trim level can be added to either the shorter Yukon or the longer Yukon XL. The standard engine is the gas-powered 6.2-liter V8 with 420 horsepower and 460 pound-feet of torque. The 3.0-liter turbodiesel straight-six is an option with 277 horsepower and the same amount of torque. Both are coupled to a 10-speed automatic and four-wheel drive. Super Cruise with towing and automatic lane change capabilities is another option, a rear-seat entertainment system and a towing package. And that's it. Pricing hasn't been announced, but it's pretty clear this will be the most expensive Yukon trim. The final numbers will be coming this June. Deliveries begin this fall.

'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).