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Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds

Hennessey Performance Engineering has created an HPE650 package for the Jeep Grand Cherokee SRT fitted with the 6.4-liter Hemi engine. When it leaves the showroom floor it has 470 horsepower and gets from 0-60 miles per hour in 4.8 seconds. When it leaves Hennessey's garage floor after the upgrade it has 650 horsepower - 530 hp at the wheels, according to Hennessey - and gets to 60 mph in 3.9 seconds on its way to running the quarter-mile in 12.6 seconds.
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.

Jeep Renegade sales being held due to powertrain issue [UPDATE]

UPDATE: An unnamed FCA US source has clarified to Automotive News that while there is a software issue, it does not concern the transmission. The Jeep Renegade appears to be facing early software problems that are similar to the ones at the introduction of the Cherokee a few years ago. The issue is keeping the brand's latest compact crossover away from dealers until the situation can be resolved. The fault reportedly deals with the software controlling the Renegade's nine-speed automatic transmission. FCA CEO Sergio Marchionne briefly talked about what was happening in an interview with Automotive News. "I'm having a very bad engineering day," he said. "It's a combination of attributes of that vehicle that is making my life horrible." The company boss predicted at the longest it could take until mid-June to fix things. Through April, Jeep has sold 5,157 Renegades, including 4,214 of them in that month alone. Autoblog reached out to an FCA US spokesperson to learn more about the software problem, but the company had no comment. Getting the software right to control the nine-speed automatic plagued development of the Cherokee. The issues delayed the model's launch in 2013, and the company was still releasing improvements for some vehicles this year.

Best places to get your car maintained and repaired

In this era of rampant inflation and high interest rates, the challenges of acquiring a car or SUV have been well documented. And so it has never been more important to protect that expensive investment by maintaining it. In recent months, Autoblog has shared Consumer Reports' evaluation of the least and most expensive car brands to keep running, as well as tips to prolong a car’s useful life. Especially since the pandemic, a number of factors have impacted these costs: more complex vehicles, new materials and manufacturing methods, a shortage of qualified technicians and replacement parts. Since 2022, repairs costs have jumped each year by about 10 percent. This month, Consumer Reports is offering a useful primer on keeping your ride in great shape, suggesting what might be the best options for searching out a repair shop, depending, as CR says, “on your car and your situation.” Author Ben Preston identifies three basic types of repair facilities: dealership service departments, independently owned repair shops, and chain repair shops. Building up trust with a specific shop and feeling comfortable going there is important. Preston quotes John Ibbotson, chief mechanic at Consumer ReportsÂ’ Auto Test Center: "You might be able to save a few bucks by going to whichever shop offers the cheapest prices, but if you want consistent, reliable service, itÂ’s best to find a repair shop you trust and stick with it,” Ibbotson says. The story goes on to evaluate each type of service facility. HereÂ’s a breakdown of CRÂ’s findings: Dealerships These work well for owners of newer cars, especially for covered warranty work. But the disadvantage is the high labor rates common to dealer service. Satisfaction ratings for dealer service departments range from very good (Acura, Lexus, Mazda, and Volvo) to not-so-good (Jeep and Kia). Dealers are best for: Fixing infotainment system glitches: "If the screen in the center of your dash has a habit of freezing up, or the touchscreen-activated climate controls arenÂ’t working, the dealership is the most likely place to find someone with the know-how to fix problems that maybe only a factory-authorized technician can access," Ibbotson says. Safety system recalibration: "Anything from a crack in your windshield to a minor fender dent can upset the calibration of the sensors that make features like automatic emergency braking and adaptive cruise control work," says Ibbotson.