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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.

Here's what it'll take to build a Jeep Grand Cherokee Hellcat

Let's get one thing straight: We want a 707-horsepower Grand Cherokee Hellcat to happen. Badly. The latest report from Motor Authority is encouraging; the bonkers SUV supposedly has a codename, Project K, and has been given the green light for production. Fingers crossed. You might be wondering why the Trackhawk isn't already a thing. Hellcat engines exist, SRT Grand Cherokees exist, so just combine the two, right? It's not quite that easy. Here, we outline what needs to happen, why it should be the quickest Hellcat vehicle out there, and why it won't come anywhere near 200 miles per hour. How To Build A Hellcat Jeep The first engineering problem is feeding the air-intensive beast that is the 6.2-liter supercharged V8. The first engineering problem is feeding the air-intensive beast that is the 6.2-liter supercharged Hellcat V8. Breathing is important on two counts: pulling in enough air for the combustion to put out 707 hp, and then cooling the various heat exchangers once the engine is up to temperature. Dodge did it with the Charger and Challenger, it can do it with the Jeep. This is one place where the Grand Cherokee's larger frontal area might be a boon, as it gives the engineers more surfaces through which to suck air. Once you generate the 707 horsepower and 650 pound-feet of torque, it has to get to the wheels somehow. Jeep's current SRT all-wheel-drive system will at least need some beefing up to handle the torque. It could require a more complete re-engineering. We at least know the ZF-supplied eight-speed auto, used in the Dodge Hellcat models, is up to the task. The Hellcat engine should fit in the Grand Cherokee, as it's about the same size as the 6.4-liter currently in SRT Jeeps, but the Hellcat is taller because of its supercharger. The hood may need to be raised or at least resculpted for clearance, as well as to address those cooling needs. Quicker Than Everything, But Not Faster 200 mph? We're skeptical, from both a physics standpoint and a legal one. A reminder of the quick/fast distinction: quick is acceleration, fast is road speed. The Jeep's all-wheel drive will help put the Hellcat engine's power to the ground in a more manageable way than the Charger and Challenger do through just the rear wheels. That means better acceleration times than the Dodges (11.0 seconds in the quarter-mile for the Charger Hellcat, 11.2 for its Challenger sibling).

Ford extends shutdown, Stellantis confirms layoffs due to chip shortage

Ford and Stellantis this week announced new production cuts due to the global semiconductor shortage, with popular models including the Ford F-150 and Jeep Grand Cherokee facing cuts. Stellantis plans to temporarily lay off workers at one facility as production is curtailed.  According to Automotive News, Ford is extending shutdowns at some of its North American facilities into May. The Blue Oval has been forced to reduce or idle production of both its redesigned F-150 pickup and the popular Explorer due to the chip shortage. The Mustang, Transit, Edge, Lincoln Nautilus and Aviator will also continue to be affected. Stellantis is planning to temporarily lay off workers at a Jeep plant in Detroit during April and May due to a shortage of semiconductor chips. The company will cut two work crews at its Jefferson North plant in Detroit for three weeks starting April 26, then call them back and lay off a third crew from May 17 through the week of May 31, according to a schedule obtained by Bloomberg News. The plant on Detroit’s east side normally operates two shifts with three work crews six days a week to keep it running 20 hours a day. “Stellantis continues to work closely with our suppliers to mitigate the manufacturing impacts caused by the various supply chain issues facing our industry,” company spokeswoman Jodi Tinson said in a statement. “Due to the unprecedented global microchip shortage, Jefferson North will adjust its production schedule through the end of May.” Jefferson North employs about 4,800 hourly workers and makes the Jeep Grand Cherokee, the top-selling Jeep model last year, and the Dodge Durango SUV. A redesigned version of the Grand Cherokee is scheduled to start production in August, according to researcher AutoForecast Solutions. This article contains reporting from Bloomberg. Plants/Manufacturing Ford Jeep Lincoln Technology chip shortage