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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.

Why the 2018 Jeep Grand Cherokee Trackhawk really exists

"But really, what do we do for Jeep? We listen to our customers, that's our job. We give them what they want. So the reason why is, they ask. Lots of them asked." – Darryl Smith "Why not?" It's a simple-enough explanation and one that should resonate with any car lover who views the absurd and the gloriously pointless as fundamental principles of their passion. And putting a ridiculously powerful engine into a vehicle that would normally not have one is perhaps the pinnacle of that. It's the reason that so many of us view a Mercedes-AMG E63 wagon as far cooler than an SLS AMG with roughly the same engine. With that in mind that we sat down with two of the men responsible for the 2018 Jeep Grand Cherokee Trackhawk, the latest entry into the absurd and gloriously pointless segment. We wanted to find out from Darryl Smith, director for SRT engineering, and Paul Mackiewicz, vehicle development manager, if there were actual market-based reasons for the Trackhawk's creation. Effectively, why'd they actually do it? "Why not?" Smith immediately offered during an interview at the New York Auto Show, clearly possessing a similar mindset. "But really, what do we do for Jeep? We listen to our customers, that's our job. We give them what they want. So the reason why is, they ask. Lots of them asked." View 24 Photos If "lots" of people are asking for a 707-horsepower, 645-pound-feet, off-road-capable, luxury-lined, five-person SUV, then perhaps we shouldn't be too worried about the demise of the human-driven automobile after all. "There is a very defined customer base out there that want a sport SUV," Mackiewicz said. "They want a sports car with the capabilities of having an SUV, of being able to tow, of being able to drive their sports car all year round. And that's what this car enables. It is ultimate performance, all year round, in any condition." If BMW, Mercedes-Benz, Porsche, and even Maserati can produce high-performance SUVs, doesn't it seem fitting that the father of all SUV brands should top them all under the hood? Of course, expanding the 6.2-liter Hellcat engine beyond the Challenger and Charger is clearly a smart business case in the current SUV-obsessed marketplace. FCA had a lust-worthy engine, and it had a solid performance base in the existing Grand Cherokee SRT, so it can be argued that marrying the two made sense and that it could be done with minimal fuss — even if in practical terms, it's absurd.

Sunday Drive: A tale of old favorites and upcoming challengers

Sedans and crossovers dominated the attention of our readers last week, led by the completely redesigned 2018 Honda Accord. It's the Japanese automaker's flagship, and people are seriously interested in finding out how good the latest Accord is. So interested, in fact, that no other single story came close to the brand-new Accord in Autoblog reader interest. Moving down the list we find the equally new 2018 Buick Enclave. The three-row crossover has a lot to offer a family, especially one looking for a nice, quiet ride. If you're looking for the exact opposite of nice and quiet, but still want enough room for you and your significant others, the Subaru WRX that we tested last week may be the perfect ride for you. Or, if you just want to drive fast and aren't at all worried about space, there's the Camaro SS. See? We offer something for everybody. From there, we look to the future. Who isn't interested in seeing the first fully electric vehicle from Porsche? And who isn't intrigued to see the Mission E testing alongside a gaggle of Teslas? A brand-new Jeep is always a big deal, especially when it's the revival of a classic nameplate like the Grand Wagoneer. And finally, we have something completely different: the Rezvani Tank. As always, tune in to Autoblog next week for a front-row seat to all the happenings worth following in the automotive industry. 2018 Honda Accord First Drive | Feels like home again 2018 Buick Enclave First Drive Review | Fortress of quietude 2018 Subaru WRX Drivers' Notes | Turbo traditionalist 2018 Chevy Camaro SS Drivers' Notes | Demonstrative power, middling interior Porsche Mission E caught testing against Teslas Jeep three-row SUV caught on public roads — Grand Wagoneer, perhaps? Rezvani Tank: It's like a Hot Wheels car brought to life Green Buick Chevrolet Honda Jeep Porsche Subaru Crossover SUV Electric Future Vehicles Luxury Off-Road Vehicles Special and Limited Editions Performance Sedan porsche mission e sunday drive