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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 resolves recall issue with NHTSA, will inspect, upgrade affected Jeeps

Chrysler made big news earlier in the month by refusing a recall request from the National Highway Traffic Safety Administration for the 1993-2004 Jeep Grand Cherokee and 2002-2007 Jeep Liberty. Last week, NHTSA boss David Strickland countered by defending his agency's request for the recall of 2.7 million Jeep SUVs. Today marked the deadline for Chrysler to formally respond to NHTSA, and it seems that both parties have met in the middle with Chrysler inspecting and upgrading some of the affected vehicles without using the word "recall," which would constitute the admission of a defect; instead, Chrysler said that it is conducting a "voluntary campaign."
At issue on these vehicles is the positioning of the fuel tank behind the rear axle that could get damaged during a rear-end collision. NHTSA has stated that at least 51 people have been killed in rear-end collisions involving these Jeeps after the vehicles caught fire, to which Chrysler countered by pointing out that both models "met and exceeded" the requirements for fuel-system integrity.
As a compromise on the situation, Chrysler says that it will inspect all pre-2004 Grand Cherokees and pre-2007 Liberty models and, "if necessary, provide an upgrade to the rear structure of the vehicle." According to Automotive News, this upgrade will consist of adding a trailer hitch that will presumably better protect the rear-mounted gas tank. Vehicles already equipped with a factory or Mopar hitch will not be modified. Chrysler's official statement on the matter is posted below, but no additional information has been released, such as when the campaign will begin and how many vehicles could be affected.

Vile Gossip: My Jeep Wrangler dreams

Jean Jennings has been writing about cars for more than 30 years, after stints as a taxicab driver and as a mechanic in the Chrysler Proving Grounds Impact Lab. She was a staff writer at Car and Driver magazine, the first executive editor and former president and editor-in-chief of Automobile Magazine, the founder of the blog Jean Knows Cars and former automotive correspondent for Good Morning America. She has lifetime awards from both the Motor Press Guild and the New England Motor Press Association. Look for more Vile Gossip columns in the future.The new 2018 Jeep Wrangler's model designation is JL, my original initials, as in Jean Lienert. Don't Google that. You'll find I died in 2014 in Pittsburgh at age 85. I take this JL thing as a sign from God that I am supposed to finally buy a new Wrangler, the very first car of my dreams when my dreams included saving $25,000 and living off the grid in a one-room log cabin with all of my cast iron pots and pans. I did live in a tiny log cabin once, but when I discovered there was no line for phone, fax and printer, I trudged down the dirt road a half mile, knocked on a stranger's door and borrowed their phone to call AT&T. So much for living off the grid. And so much for the Wrangler. I bought a truck, which was useful, but it was not a Jeep, a fact confirmed when I landed a job writing about cars. Among the Porsches and Fords and Ferraris and Dodge Power Wagons were Jeep Wranglers. Wranglers meant adventure. Here are two favorites:1981 — Delivering the Pig of Bronze, Car and Driver's over-accessorized 1978 project Jeep CJ-7 (named for its chrome hood ornament), to the police chief of rural Waterloo, Neb. He got it because he wrote the editor a letter asking for it. It was my assignment to drive it there. I plotted as many miles of dirt roads as possible between Michigan and Nebraska, not wanting to waste my first big Jeep adventure on pavement and never questioning the ability of this denim-trimmed orange Jeep and its aftermarket aluminum wheels to get us there.So naive. Somewhere in deepest Iowa with the windshield flipped down to the hood for maximum coolness, the Pig's rear end began to shudder. As we rolled to a stop, the photographer looked back in time to see one of the five fancy extra-long chrome lug nuts plop into the dust. Two others had vanished. The last two had backed off to the ends of their studs.