2010 Jeep Wrangler Unlimited Rubicon Sport Utility 4-door 3.8l on 2040-cars

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Jeep Grand Cherokee SRT gets power increase, minor tweaks for 2015

As a brand within Fiat Chrysler Automobiles, SRT may have an uncertain future, but it's pumping out some seriously mean machines anyway. The supercharged Hellcat V8 may be gobbling up most of the headlines with its 707 horsepower, but even the Grand Cherokee SRT is getting some small updates for the 2015 model year.
Most importantly for many enthusiasts, the Grand Cherokee SRT is getting a slight power bump. Don't expect the 700+ hp from the Hellcat, but this SUV sees a modest 5-hp and 5-pound-feet of torque improvement to bring output to 475 hp and 470 lb-ft for its 6.4-liter V8 with an eight-speed automatic. The minor change doesn't change the sprint to 60 miles per hour, clocking in at the same 4.8 seconds, or the tow rating at 7,200 pounds. Still, more grunt is never a bad idea.
Another new addition is the Active Noise Canceling system as a standard feature for this powerful SUV. It adds four microphones around the vehicle and uses the stereo system to nullify extraneous sound. However, Jeep claims that the meaty exhaust note from the V8 still gets through into the cabin for driver enjoyment.

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.