2005 Jeep Grand Cherokee Laredo Sport Utility 4-door 3.7l on 2040-cars

Auto blog

Vile Gossip: Ladies who launch

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 year was 2006. We were driving a Bugatti Veyron 16.4 across the Florida Panhandle from Jacksonville to Panama City, only because I couldn't convince Bugatti to let me be the first to drive its exotic powerhouse, the world's fastest car at that time, all the way across America. One gleaming example had arrived in time for the Amelia Island Concours d'Elegance, where the journos massed for their quick test drives out the front drive of the Ritz Carlton, down a short stretch of the A1A, and back to the Ritz. Not far enough for me. I wanted to take the Veyron in all of its 16-cylinder, 1,001-horsepower, $1.3-million-dollar glory on a coast-to-coast extravaganza of a road trip. Never hurts to ask. I asked. Once the Bugatti guys stopped hyperventilating, I explained that the coastal adventure would be contained wholly within the state of Florida, from the Atlantic coast to the Gulf of Mexico. My secret destination, however, was to be Vernon, Florida, home of the great Errol Morris' classic documentary about a town in the Panhandle with the highest per-capita population of citizens who'd blown off or whacked off a limb for insurance money. (Google "Nub City.") The Swiss head of Bugatti public relations thought it hilarious. He showed up in a van with a couple of German mechanics to follow us and a failed French Formula 1 driver to serve as my chaperone. I came with a photographer from Germany and one of the most infamous of bad-boy auto magazine tech editors, the irrepressible Don Sherman. Sherman had his own reason for going, and it had nothing to do with a Veyron to Vernon. Once we gave up looking for nubbies, he ordered me to veer south to the handgrip of the Panhandle, familiarly known as the Redneck Riviera. The Don was aiming to secretly execute the Veyron's first Launch Control blastoff in captivity.

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.