2015 Gmc Acadia Slt Sport Utility 4-door on 2040-cars

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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

2015 Chevy Silverado, GMC Sierra recalled for steering issues

DETROIT — General Motors Co is recalling more than 1 million pickup trucks and sport utility vehicles in the United States due to issues with a temporary loss of power steering, the National Highway Traffic Safety Administration said. The recall is for 2015 models. They are: the Chevy Silverado 1500, Suburban and Tahoe, GMC Sierra 1500, Yukon and Yukon XL and Cadillac Escalade. The problem may cause difficulty steering the vehicle, especially at low speeds, increasing the risk of a crash, the auto safety regulator said in a document dated Sept. 12. The document did not highlight any reports of accidents and injuries, because of the power steering issue. GM dealers will update the power steering module software, free of charge for owners of the affected vehicles. In 2014, the No.1 U.S. automaker had recalled nearly 800,000 pickup trucks worldwide because of the same problem. GM did not immediately respond to a request for comment.Related Video:

Driving the Kia K5 and Mini Cooper JCW GP, plus an interview with Jimmy Chin | Autoblog Podcast #637

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and News Editor Joel Stocksdale. They veer off right away into talking about their dream project garages. Next up is news, including some info on the next Nissan Z car, the Honda Fit being discontinued in the U.S., new Mercedes-Benz EQS details, and some talk about the new, electric GMC Hummer being adapted for the military. Then they talk about driving the new Kia K5 sedan and the Mini Cooper JCW GP, before they opine about the 1966 Pontiac GTO. Autoblog Senior Producer Chris McGraw interviews Oscar-winning filmmaker Jimmy Chin about his collaboration with Ford for the Bronco reveal, and more. Finally, our editors help a listener in the U.K. pick a used vehicle in the "Spend My Money" segment. Autoblog Podcast #637 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Some thoughts on project cars News Nissan suggests the next-generation Z won't be electrified at launch Fit Is Gone! Honda drops subcompact hatch in U.S. Mercedes-Benz announces the electric EQS will offer over 435 miles of range GMC's electric Hummer could someday serve alongside the Humvee in the U.S. Army Driving the 2021 Kia K5 Driving the 2020 Mini Cooper JCW GP 1966 Pontiac GTO: Love it or hate it? We talk Ford Bronco and other adventures with Oscar-winning filmmaker Jimmy Chin Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: