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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.

Callaway, Lingenfelter boost Corvette Z06 way beyond 700 hp

With 650 horsepower and just as much torque on tap, few would accuse the latest Corvette Z06 of being down on power. But for those who'll always demand more, two leading Corvette tuners have just announced new tuning packages for the Z06 to boost Chevy's flagship well beyond 700 horsepower. The more powerful of the two comes from Callaway Cars, which has added a larger supercharger, a triple-action intercooler, and more to increase output to a massive 757 horsepower and 777 pound-feet of torque. The result, according to Callaway, is a 0-60 time quoted at 2.8 seconds and a quarter-mile run in 10.5. The package also includes a reshaped hood, all manner of trim upgrades, and a three-year warranty, and will set you back nearly $17k on top of the cost of donor vehicle that currently lists for $79,000. In what could only come second relative to Callaway's kit, Lingenfelter Performance Engineering has also released a Stage 1 package for the Z06. The kit includes a new dry sump damper, upgraded supercharger pulley and drive belt, and more – all of which Lingenfelter says will boost the Vette's output up to 720 hp and 730 lb-ft. Revised performance figures weren't released, but despite the 37-horse, 47 lb-ft deficit, we doubt it'd trail Callaway's by much. But both would likely leave the stock Z06 in their dust, and you can read more about them in the press releases below. Related Video: Callaway Cars Releases Their Most Powerful Corvette - 757 bhp / 777 lb-ft - Z06-based Corvette upgrade boasts 32% larger supercharger, triple intercoolers, and consistent power - lap after lap The Numbers - Callaway Cars today announced power numbers and performance for the flagship model in their performance car lineup. Equipped with Callaway's GenThree Supercharger, the Corvette Z06 now produces 757 bhp @ 6,200 rpm and 777 lb-ft @ 4,500 rpm (SAE). A launch to 60 mph is now achieved in 2.8 seconds, and a quarter-mile in 10.5 seconds at 131 mph. Why Go Big, When You Can Go Bigger? - Size Matters. To reach that power (which is up from 650 bhp / 650 lb-ft) the supercharger itself needed to be bigger since the output of a positive displacement supercharger is proportionate to its size. The Callaway GenThree supercharger is 32% larger in displacement (2300cc vs 1740cc). Cooling - Callaway engineers recognize that a key contributor to maximizing power is reduction of inlet air temperature associated with forced induction.

This week in EVs: Electric Jeeps, Chevy Equinox, reborn VW bus

There's going to be tons of car news next week as the Detroit Auto Show makes its return after 48 years. OK, so the pandemic and the show's shifting calendar only made it feel like 48 years, but January 2019 was still a long time ago. As we await that wave of headlines, let's look back at the substantial week that already was, specifically in terms of the electric car news that broke. Electric Jeep Recon and Wagoneer S blaze trail to brand's EV future Jeep declared Thursday to be 4xe Day as it revealed loads of previously unknown information about its future electrification efforts. The biggest surprise was the extremely cool and 100% electric Jeep Recon. Although it looks like a Wrangler, it's absolutely not a Wrangler replacement, and is indeed quite different for reasons besides its powertrain (independent front and rear suspension, fully enclosed fenders, fixed roof). As the photos attest, though, you'll be able to remove the doors and rear-quarter windows just like a Wrangler. And again, it's electric. Expect the Recon to be one of the most eagerly anticipated new vehicles over the next couple of years. Yes, years, plural. Production will start in 2024 with reservations accepted starting early next year. Jeep Recon View 5 Photos   There was then the Wagoneer S. Despite the name, it isn't a sportier Wagoneer variant or even an electric Wagoneer. In fact, the name is temporary according to chief designer Ralph Gilles. This sleek SUV, which sure looks like Jeep's attempt at a Range Rover Vilar (not a bad thing), will apparently have a 600-horsepower electric powertrain. It too will be produced in North America starting in 2024 with reservations starting early next year. Jeep Wagoneer S View 4 Photos   There actually WILL be an electrified Wagoneer, however: the Grand Wagoneer 4xe PHEV. That's good since the Grand Wagoneer gets pretty atrocious fuel economy. Details were light regarding specs, but we did get a half-decent photo. Finally, the first of these electrified Jeeps to launch will be the Avenger. Yes, Chrysler/Stellantis is dusting off an old Dodge name for a Jeep. That Dodge in question wasn't sold in Europe, though (good for them), which is important since the Jeep Avenger will only be sold on the other side of the pond. It's mechanically based on the same platform as several French Stellantis EV SUVs, and only goes 249 miles on the far more generous European WLTP test cycle.