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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.

Chrysler recalling 644k more Dodge Durango and Jeep Grand Cherokee SUVs over brakes

Early last month, we reported on Chrysler issuing a preemptive, proactive recall for about 25,000 units of the Jeep Grand Cherokee and Dodge Durango. The issue revolved around a brake system that wasn't causing any actual problems, but delivered an unsatisfactory brake feel, so Auburn Hills called in a good 25,000 of SUVs around the world, including 18,700 in the United States.
Now Chrysler, having apparently determined that the brake problem on its sport utes is actually much bigger than it initially realized, has drastically broadened the scope of the recall. As a result, the National Highway Traffic Safety Administration has issued a recall for precisely 655,354 examples of the Grand Cherokee and Durango, covering the 2011 through 2014 model years. In addition, Chrysler is recalling 42,380 units in Canada, 21,376 in Mexico and 159,685 overseas.
The problem which Chrysler found revolves around the brake booster, whose center shell has been found to be subject to corrosion, allowing water to get into the brake system. That water in turn could freeze, preventing the brakes from working as well as expected.

Jeep Renegade and Fiat 500X finally on the way to dealers

After a brief pause, the Jeep Renegade and Fiat 500X are on their way to dealers again. While initially reported as a software bug, the issue had nothing to do with the models themselves. According to a statement from FCA US to Autoblog, the "vehicles were built with an atypical Vehicle Identification Number that may not be recognized as valid by some computer systems." That problem has now been fixed. FCA US held the compact crossovers back from dealers until the company could rectify the bug. If the CUVs had been delivered, there would have been difficulty registering the vehicles, according to Automotive News. Before discovering the situation, about 20 of these Renegades were sold to customers. FCA CEO Sergio Marchionne originally discussed the predicament in late May. "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." While the boss predicted the problem would be fixed as late as mid-June, the company apparently got things working much quicker than that. Related Video: FCA US Statement A limited number of 2015 Jeep Renegade and 2016 Fiat 500X vehicles were built with an atypical Vehicle Identification Number (VIN) that may not be recognized as valid by some computer systems. This VIN issue has been resolved. FCA US has been working with governmental agencies, insurers and financial institutions with whom customers may interact to ensure successful registration, financing and insurance coverage. Renegade and 500X vehicles are being shipped and are in stock at dealerships for purchase. The VIN issue is entirely separate from the operation of the vehicle.