2004 Jeep Liberty Limited Sport Utility 4-door 3.7l on 2040-cars

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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.

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.

Jeep teases pair of Moab concepts early

With the 47th annual Moab Easter Jeep Safari coming up at the end of this month, Jeep is preparing to roll out six new off-road-ready concept vehicles. The first two being teased are the Jeep Grand Cherokee "Trailhawk II" concept and the Jeep Wrangler "Slim," and while we have no information on either, we at least get an idea of what they'll look like.
We can't tell why this Wrangler is called Slim, but it has a nice black-and-red paint scheme with a serious off-roading front bumper and five-spoke beadlock wheels. There's even less we can figure out about the Grand Cherokee's Trailhawk II concept except that it appears to be painted up in the same Crusher Orange paint job as the recently introduced SRT Viper TA. We'll likely more of these as well as peeks at the other Moab concepts as we get closet to this year's Moab Easter Jeep Safari, which will be held March 23 through 31.