1995 Monster Suburban. 502 Bigblock V8 on 2040-cars

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GM reworking mandatory OnStar plans for some 2024 models

For the 2023 model year, GM added its OnStar and Connected Services plan as standard equipment to a large number of Buick, GMC, and Chevrolet vehicles. Folding the $1,500 retail price into the MSRPs of models like the GMC Acadia and Buick Encore plumped up prices beyond the usual year-on-year bumps. Looks like there's a reversal in play for 2024, GM Authority reporting that many of the models fitted with OnStar and Connected Services — now called OnStar Premium — will step down to three years of OnStar Remote Access standard.   OnStar Remote Access comes with these features: Remote key fob, vehicle locate, and remote personalization through mobile and in-vehicle apps. Three additional features can be added to the plan: OnStar Guardian, in-vehicle hotspot, and Super Cruise. Owners can also upgrade to OnStar Premium if they choose.  Higher trims like Buick's Avenir and GMC's Denali, plus the GMC Hummer and the Cadillac Escalade will retain OnStar Premium as standard equipment. That suite starts with Remote Access and adds: Automatic crash response, stolen vehicle assistance and recovery, OnStar Guardian, in-vehicle app access, unlimited streaming, three years of Super Cruise on vehicles with the hardware, and six months of SiriusXM radio. The Escalade puts a cherry on top with three years Sirius XM instead of six months. The Remote Access plan normally charges $14.99 per month. We're not sure yet if GM will subtract the cost of OnStar Premium from the MSRP and add the $540 for OnStar Remote Access, or if the trial period comes free of charge. Even if that's what happens, the change could take nearly $1,000 off the MSRP of a car like the GMC Acadia before any 2024 increases. We'll know more as the 2024MY models roll out and prices are announced. Related Video 2022 Buick Enclave Avenir revealed

GMC reveals updated 2016 Sierra

It was just the other day that Chevy revealed the face of the new 2016 Silverado. And as might have been expected, sister brand GMC has followed up by unveiling its version in the facelifted 2016 Sierra pickup – just two and a half years since the current all-new model was rolled out. Though details released thus far remain few and far between, GMC has revealed more images of the new Sierra – in SLT, Denali and All Terrain trim levels – than Chevy did of the updated Silverado. It's got new headlights, fog lamps, and C-shaped daytime running lights and taillights, all using LED elements. It's arguably a more muscular look than the Chevy version, and with more chrome than the toned-down Silverado. That is, at least, in SLT and Denali trims. The All Terrain version looks more in line with the similarly off-road-focused Silverado Z71 and its color-keyed treatment. The changes ought to help GMC keep up the momentum that has seen its sales rise year-over-year every month over the past twelve. The interior shots indicate that the new Sierra will incorporate Apple CarPlay like GM is installing in so many models across its various brand ranges. But we'll have to wait a little while longer for all the details. Related Video: 2016 GMC Sierra Unveiled 2015-07-15 DETROIT -- GMC's best-selling truck has great momentum coming off its best June since 2006 and 12 consecutive months of year-over-year sales gains. With exterior styling as its top reason for purchase, the new truck adds key design elements: LED "C-shaped" signature daytime running lights and LED headlights; new front fascia and grilles for each trim level; new LED fog lamps; new bumpers; and new "C-shaped" LED taillights. The new Sierra will be available in the fourth quarter of this year, with additional details and information on the new model released in the coming months.

'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).