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We're set to record Autoblog Podcast #325 tonight, and you can drop us your questions and comments via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #325
Twin-turbo Cadillac CTS coming

Fullsize GM SUVs have a problem that's making owners sick

Some fullsize SUV owners are getting sick, thanks to a buffeting and vibration problem in 2015 model year examples of the Chevy Tahoe and Suburban, Cadillac Escalade, and GMC Yukon. According to owners' complaints to the National Highway Traffic Safety Administration, the issue can vary from an annoying vibration inside the cabin to an experience so severe that it leads to dizziness and headaches. General Motors is aware of the complaints, but the fix isn't so simple. According to spokesperson Tom Wilkinson to Autoblog, the company "has been tracking this issue for a while." The problem has a fairly low incidence rate, but when it does occur the issue can be "uncomfortable and annoying for owners." There's no precise cause for the issue, Wilkinson claims, and in some cases, simply balancing the tires or changing the door seals can make it go away. However, not all of the fixes are so simple. AutoGuide dug deep into the problem and discovered a GM preliminary information bulletin that advised dealers to remove the headliner and to check the roof's bonds to the bows that go across the vehicle. However, that document included a note that the solution might not entirely eliminate things. According to AutoGuide, adding Dynamat insulation to the roof sometimes helped the problem. A GM spokesperson also told AutoGuide the company fixed the problem at the end of the 2015 model year, and didn't go into any more detail. This roof issue seems linked to some of the worst droning in these SUVs. According to one complaint from a 2015 Suburban owner to NHTSA: "Roof will not remain attached to the roof bows. This causes the buffeting similar to a window being down when all are up. The results span from annoying to painful." A 2015 Yukon owner claims to have another alleged cause for the problem in a NHTSA complaint from February 2015. This person brought their SUV to the dealer seven times over the course of four weeks for vibrations. The dealer replaced the driveshaft, suspension components, and more, but nothing worked. According to an engineer to the service adviser: "In an effort to prevent roll overs, they designed the frame and body mounts too stiff. There are 40 engineers working on issues, they have no solutions that work across the board." Wilkinson told Autoblog that GM is working with customers on an individual basis to rectify things. Since these are newer vehicles, dealers should also fix the problem under warranty.

Cadillac Escalade reportedly getting 200-hp bump from supercharger

Cadillac is preparing to supercharge the Escalade, according to a recent report. The body-on-frame General Motors SUVs that it shares its basic underpinnings with are allegedly in line to receive a big increase in power, too. Released for the 2021 model year, the fifth-generation Escalade eschewed downsizing and launched with a 6.2-liter V8 as its standard engine. It develops 420 horsepower and 460 pound-feet of torque when it's naturally aspirated, and Motor Trend learned from an anonymous source that the optional supercharger will increase the first figure to anywhere between 600 and 625. The eight's torque output will undoubtedly go up, too. The supercharged Escalade won't outgun the sold-out Dodge Durango SRT Hellcat, which gets 710 horses, but it will pack a serious punch. It doesn't sound like the V8 will require significant modifications to handle the extra power because the supercharger kit will likely be installed by dealers, not on the assembly line. This strongly suggests that it's more of a bolt-on job than one that requires taking the engine out and apart to install stronger connecting rods and forged pistons, for example. ECU tweaks will be part of the package, too, and the fuel delivery system may require some upgrades. Interestingly, Motor Trend learned from Texas-based Hennessey that the SUV's ECU is locked to tuners, which adds credibility to the report. Motorists who want more power will need to go through official sales channels, then. Bigger brakes and a firmer suspension won't be part of the package — at least not yet. The same source outlined a true high-performance evolution of the body-on-frame behemoth that will be quicker and tighter to drive. Oddly, it's not being developed by the engineers in charge of Cadillac's V-branded models, according to the report. If the report is accurate, we'll learn more about the supercharged Cadillac Escalade in the coming months, and it might go on sale in time for the 2022 model year. Expect the supercharger to come with a four-digit price tag. Chevrolet's Tahoe/Suburban and GMC's Yukon/Yukon XL will reportedly be available with a supercharger, too.