2021 Jeep Grand Cherokee Full-size SUV Laguna Niguel
The all-new 2021 Jeep Grand Cherokee L offers buyers a choice of two powerful, fuel-efficient and refined engines with proven performance for any driving situation.
Standard is the all-aluminum 3.6-liter Pentastar V-6 engine, rated at 293 horsepower and 260 lb.-ft. of torque. Lauded for its power and refinement, the 60-degree angle between the Pentastar V-6’s cylinder banks make it inherently smooth running, augmented by accessories that bolt directly to the engine block. A seven-time winner of the Wards 10 Best Engines and Propulsion Systems award, the Pentastar V-6 engine is compact, with features such as exhaust manifolds integrated into the cylinder heads.
Chain-driven dual overhead camshafts include two-step variable valve lift and variable-valve timing (VVT). This combination quickly tailors engine output to the demands of the driver for the best balance of performance and fuel economy.
Fuel-saving engine stop-start (ESS) technology is standard on the Pentastar V-6. The ESS system has been upgraded and refined for the Grand Cherokee L. Changes include a pressure reserve element in the eight-speed transmission, which provides dedicated transmission fluid to the shift elements at engine restart for a quick launch. Refined powertrain controls and new starter technology minimize early engine restarts from minor movements of the driver’s foot on the brake pedal. Restart noise, vibration and harshness have been reduced via revised controls and switchable engine mounts.
The 3.6-liter Pentastar V-6 engine is rated for a towing capacity of up to 6,200 pounds and an estimated class-leading driving range of nearly 500 miles.
VVT with dual-independent cam phasing enables better fuel efficiency across a wide torque band in the Pentastar V-6. Nearly 90 percent of the engine’s peak torque is available from 1,800 to 6,400 rpm – an important consideration when towing or hauling.
Buyers who want more power can opt for the award-winning 5.7-liter V-8, rated at 357 horsepower and 390 lb.-ft. of torque delivered over a broad power band.
The V-8, with a foundation of a cast-iron block and aluminum cylinder heads, delivers performance and efficiency with VVT and Fuel Saver Technology (cylinder deactivation). With Fuel Saver Technology, the engine control computer turns off fuel and spark and closes the valves to four of the engine’s cylinders during light-load operation, such as highway cruising, when full power is not needed. The system immediately re-engages the deactivated cylinders when the driver presses on the accelerator pedal.
The 5.7-liter V-8 has a class-leading towing capacity of up to 7,200 pounds.
The Grand Cherokee L’s V-8 engine uses cylinder shut-off technology that deactivates four cylinders during light acceleration or cruising situations on the highway. The system is active in an expanded region with respect to the previous generations and is unnoticeable to the driver. It provides V-8 power for acceleration and heavy loads and four-cylinder operation when the torque requirement is less than the maximum available from four cylinders. Depending on the driving scenario, cylinder shutoff can increase fuel economy from 5 to 20 percent.
Fuel economy is further enhanced with VVT technology that reduces the engine’s pumping work by closing the intake valve later and by increasing the expansion process of the combustion event. This allows more energy to be transferred to the wheels instead of being lost out of the exhaust as heat. VVT also improves engine breathing, which improves engine efficiency and power.
Each engine mates to the durable, robust TorqueFlite eight-speed automatic transmission, which enhances fuel economy and delivers crisp and smooth gear changes. The widespread of gear ratios helps keep the engine rpm in the ideal range for the task – whether it’s cruising on the highway or exploring off-road trails. On-the-fly shift-map changing enables the transmission to quickly adjust its shift strategy to match the driver’s demands based on inputs, such as engine torque changes, hill detection, temperature and longitudinal and lateral acceleration.
New for the 2021 Grand Cherokee L 4×4 is front-axle disconnect. If the vehicle senses that road conditions do not require all-wheel drive, the front-axle disconnect automatically places the Grand Cherokee L in two-wheel drive, reducing drag on the driveline and improving fuel economy. Four-wheel drive automatically re-engages when the vehicle senses it is needed.