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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.

2023 J.D. Power APEAL Study shows new-car customer satisfaction scores slip

J.D. Power survey results have been slightly up but mostly down for automakers this year, literally. In February, the 2023 Vehicle Dependability Study showed an overall decline compared the 2022 a month before the Customer Service Index Study did the same. The trend reversed in June with a better overall score on the 2023 U.S. Electric Vehicle Consideration Study than in 2022, then declined again the same month on with a lower overall score on the 2023 Initial Quality Study. The declines continue with the 2023 J.D. Power U.S. Automotive Performance, Execution and Layout (APEAL) Study, overall satisfaction among the 84,555 respondents down two points overall compared to 2022, to 845 out of 1,000 points. Because last year's score dropped compared to 2021, this year marks the first consecutive decline in the study's 28-year history. The study tries to "[measure] owners' emotional attachment and level of excitement with new vehicle" after 90 days of ownership by asking new owners to rate 37 attributes in 10 areas around the vehicle, such as the feeling they get when they hit the accelerator. Satisfaction with nine of the attributes is down this year versus last, fuel economy the only segment to show better results with 15 points more satisfaction. Styling and infotainment are big drags on satisfaction. Responses to new car exterior looks tallied 888 points, down from 894 last year, the largest drop in this year's study. On the digital side, less than half of those surveyed this year said they prefer using a manufacturer's built-in infotainment. From 70% of respondents in 2020 preferring to use a manufacturer's in-house software to play audio instead of Android Auto or Apple CarPlay, that's 56% in 2023. Going all-in on Google appears to have the best effect. J.D. Power said that vehicles with both Google's Android Automotive Operating System (AAOS) and Google Automotive Services (GAS) "score higher in the infotainment category than those with no AAOS whatsoever. AAOS without GAS receives the lowest scores for infotainment of the three categories."  Frank Hanley, senior director of auto benchmarking at J.D. Power, said, "Despite the technology and design innovations that manufacturers put into new vehicles, owners are lukewarm about them. While innovations like charging pads, vehicle apps and advanced audio features should enhance an owner’s experience, this is not the case when problems are experienced.

Toyota Land Cruiser, GMC Sierra and the long-term fleet | Autoblog Podcast #558

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski. They talk about driving a pair of short-term test cars, the Toyota Land Cruiser and GMC Sierra AT4, as well as two of Autoblog's long-term test cars, the 2018 Kia Stinger GT and 2018 Chrysler Pacifica Hybrid. Following the test fleet talk is a discussion of a new program from Lyft and the Chinese-market Ford Territory. And of course everything is wrapped up with yet another Spend My Money segment in which we Autoblog editors help a reader choose a car to buy.Autoblog Podcast #558 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 Short-term cars: Toyota Land Cruiser and GMC Sierra AT4 Long-term cars: Kia Stinger GT and Chrysler Pacifica Hybrid Lyft subscription program Ford Territory Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Podcasts Chrysler GMC Kia Toyota toyota land cruiser chrysler pacifica chrysler pacifica hybrid kia stinger gt