2006 Jeep Grand Cherokee Srt8 Sport Utility 4-door 6.1l on 2040-cars

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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.

FCA's Pentastar V6 gets more power, efficiency for 2016

Already a vital member of FCA's powertrain lineup, the 3.6-liter Pentastar V6 is receiving major efficiency improvements for 2016. Thanks to a massive amount of new tech attached to the mill, fuel economy is up six percent, and torque below 3,000 rpm jumps nearly 15 percent. The updates arrive first in the 2016 Jeep Grand Cherokee, but they should proliferate to other models eventually. At least in the Grand Cherokee, the tweaks push power up five horsepower to 295 ponies. FCA's engineers went through the Pentastar from top to bottom to eke out as much efficiency as possible. For example, there's now a two-speed variable-valve lift system that can run in low- or high-lift modes. This upgrade is responsible for 2.7-percent better economy, the company claims. A new intake manifold with longer runners and updated variable-valve times also helps boost the torque output. Further improvements come from pushing the compression ratio to 11.3:1, from 10.2:1 before. Perhaps most impressive is that despite all of the innovations, the latest Pentastar actually weighs four pounds less than the current version. Beyond the Pentastar improvements, all of the FCA US gasoline engines, except for the Viper's 8.4-liter V10, will be E15-compatible for 2016. The company says that it wants to be ready for the higher ethanol content fuel's greater use in the near future.

LA-bound 2014 Jeep Wrangler special edition gives us the Willys for $25,795

The Jeep Wrangler might be the reigning king of special editions, but with sales records being broken almost all year, this plan is obviously resonating with buyers. Joining new models like the Dragon Edition and Polar Edition, the 2014 Jeep Wrangler is adding a new Willys Wheeler Edition to pay homage to Jeep's military heritage.
Getting ready for its big debut at the LA Auto Show, the 2014 Jeep Wrangler Willys Wheeler Edition is inspired by early Willys CJ (Civilian Jeep) models with exclusive styling and upgraded off-road goodies. Starting with a Wrangler Sport, these upgrades include a Dana 44 rear axle with limited-slip differential and 3.73 gears, along with meaty BF Goodrich KM Mud Terrain tires mounted to the Willys Wheeler's black 17-inch wheels. For more of a classic Jeep look, this model adds a gloss black grille, "Willys" hood stickers and rock rails to protect the side sills. Jeep is also tossing in a D-ring, tow strap and gloves that are all kept in a special carrying bag.
When it goes on sale early next year, the Wrangler Willys Wheeler Edition will start at $25,795 for the two-door model, while the four-door will start at $29,595. There's an official press release posted below, and we'll be sure to have live images of the special-edition Wrangler live from the LA Auto Show floor later this week, so stay close.