The base engine is a flexible-fuel 3.6-liter V-6 engine pumping out 280
horsepower (209 kW) and 260 lb.-ft. of torque (353 N?m) @ 4,800 rpm -
an improvement of 70 hp and 25 lb-ft over the current 3.7 liter V6.
Despite that, and a heavier vehicle (4,470 lb vs 4,261 lb), gas mileage
should be 11% higher.
The 3.6-liter V-6 engine is a completely new, state of the art design
with dual overhead camshafts (DOHC) and a high-pressure die-cast
aluminum cylinder block with variable-valve timing (VVT). Gas mileage
is better than the Toyota 4Runner and similar to the less
off-road-worthy Honda Pilot.
The Phoenix V6 comes with the Mercedes W5A580 five-speed automatic,
which has adaptive electronic control or Electronic Range Select (ERS)
driver-interactive manual control. The gas tank has been increased to a
24.6 gallon capacity, which allows for a range of around 500 miles.
The optional Hemi V8 engine now delivers 360 horsepower (268 kW) and
390 lb.-ft. of torque (520 N?m) @ 4,250 rpm; it uses cylinder
deactivation and variable valve timing to increase mileage. The Hemi is
coupled to the reliable, smooth Chrysler-designed 545RFE five-speed
automatic transmission, which has a sixth forward speed for highway
kickdown. The premium Overland 4x4 weighs around 5,210 lb, an increase
of 320 lb over the 2008 Overland.
2011 Jeep Grand Cherokee's trailer towing capability is up to 7,400
pounds on rear wheel drive models equipped with the HEMI V-8 engine.
As in the past, the 2011 Jeep Grand Cherokee will be available in left-
and right-hand drive with either diesel or petrol powertrains for
international sale.
Quadra-Lift and Selec-Terrain?

The Quadra-Lift system features five height settings for optimum ride performance:
* Normal Ride Height (NRH): 8.1 inches of clearance for better aerodynamics during on-road driving
* Off-road 1: Lifts the vehicle an additional 1.5 inches to clear obstacles (9.6 inches)
* Off-road 2: An additional 3 inches of height for 11.1 inches of ground clearance
* Park Mode: Lowers the vehicle 1.5 inches from NRH for easy
ingress/egress. NRH and Park mode are driver-selectable giving the
driver control over vehicle ride height.
* Aero Mode: Lowers the vehicle .6 inches from NRH. Aero Mode is
controlled by vehicle speed and adjusts for optimal performance and
fuel economy.
Quadra-Lift includes four-corner air springs; it operates automatically, or via console controls.
The new Selec-Terrain? traction control system lets customers choose
the off-road setting; it electronically coordinates up to 12 different
powertrain, braking and suspension systems, including throttle control,
transmission shift, transfer case, Traction Control and Electronic
Stability Control (ESC). The control dial allows the driver to choose
from five driving conditions:
* Sand/Mud: Traction control and Quadra-Lift operate with sensitive
response to wheel spin, and torque is tuned for optimal performance
* Sport: Provides enhanced on-road "fun-to-drive" capability
* Auto: Automatically adapts to any on- or off-road situation
* Snow: Vehicle traction and Quadra-Lift adjust for ultimate performance over snow-covered roads
* Rock: Quadra-Lift suspension raises to maximum height (11.1
inches) and the transfer case, differentials, and throttle coordinate
to provide low-speed control
Quadra Trac I delivers full-time four-wheel drive without any switches
or levers to pull. The system provides smooth operation over a variety
of road conditions. This light-weight single-speed case is both proven
and highly efficient for enhanced fuel economy.
Quadra Trac II's two-speed transfer case uses sensors to determine tire
slip and take corrective action. The system uses Throttle Anticipate to
sense quick movement in the throttle from a stop and maximizes traction
before slippage occurs. When tire slippage is detected, as much as 100%
of available torque is instantly routed to the axle with the most
traction. Selec-Terrain is standard with Quadra Trac II and Quadra
Drive II.
Quadra Drive II, with a rear Electronic Limited-Slip Differential
(ELSD), delivers industry-leading tractive capability. The system
instantly detects tire slip and smoothly distributes engine torque to
tires with traction. In some cases, the vehicle will anticipate low
traction and adjust in order to proactively limit or eliminate slip.
Selec-Terrain is standard with Quadra Trac II and Quadra Drive II.
All 2011 Jeep Grand Cherokees equipped with either the off-road or the
Quadra-Lift group are Trail Rated®. The Jeep Trail Rated badge on the
2011 Jeep Grand Cherokee indicates that the vehicle has been designed
to perform in a variety of challenging off-road conditions identified
by five key consumer-oriented performance categories: traction, ground
clearance, maneuverability, articulation and water fording.
Jeep Trail Rated is a unique methodology used by Jeep Engineering to
measure and predict off-road performance for all Jeep vehicles. Through
a combination of natural and controlled field tests, Jeep Trail Rated
provides a consistent measurement of off-road performance for all Jeep
vehicles. Only Jeep vehicles are Trail Rated.
Engineers will conduct approximately 7.5 million customer-equivalent
miles for durability and reliability testing of the all-new 2011 Jeep
Grand Cherokee. Testing and validation in various climates include road
trips to a variety of locations including Yucca, Arizona, Baudette,
Minn. and Morgantown, West Virginia. A full battery of lab testing will
include full-frame fatigue testing, door-slam testing and a road-test
simulator.
The 2011 Jeep Grand Cherokee has gone through more than 244 hours of
wind noise and aerodynamic evaluations in Chrysler LLC's
state-of-the-art aerodynamic and acoustic test facility in Auburn
Hills, Mich.
Reliability and quality were achieved through extensive validation
testing in developing the Jeep Grand Cherokee's all-new 3.6-liter V-6
engine. More than 3.3 million customer-equivalent miles were recorded
on engine dynamometers prior to production. Severity testing was
increased 50% versus previous Chrysler V-6 engines - which have
generally had strong durability - to accommodate high-load applications
including trailer-towing.
The reduction of noise, vibration and harshness (NVH) was a key
objective for every component during the design phase of the engine and
was achieved by utilizing an advanced computer-aided engineering
technique.
The use of a Quality Assurance Fixture (QAF) assures a high level of
compliance at the start of production. The QAF allows engineers to look
at the interior of the vehicle on a "simulated perfect body" which is a
milled aluminum shell where all attachment points are matched exactly
to CATIA modeling earlier in the program. This allows changes and
design improvements earlier in the manufacturing process.
The company also employs techniques of Design for Six Sigma (DFSS),
which is folding in "voice of the customer" data along with lessons
learned to ensure that every vehicle is of the highest quality. The
2011 Jeep Grand Cherokee is the first new vehicle to have more than 100
DFSS projects.