2020 Jeep Grand Cherokee SRT vs. 2020 Porsche Cayenne

Detailed Review, Specifications & Comparison

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Safety

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The Grand Cherokee SRT has standard Active Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Head Restraints system moves the headrests forward to prevent neck and spine injuries. The Cayenne doesn’t offer a whiplash protection system.

Both the Grand Cherokee SRT and the Cayenne have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, all-wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights and rearview cameras.

Warranty

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Jeep’s powertrain warranty covers the Grand Cherokee SRT 1 year and 10,000 miles longer than Porsche covers the Cayenne. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 5 years or 60,000 miles. Coverage on the Cayenne ends after only 4 years or 50,000 miles.

There are almost 13 times as many Jeep dealers as there are Porsche dealers, which makes it much easier should you ever need service under the Grand Cherokee SRT’s warranty.

Reliability

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The Jeep Grand Cherokee SRT’s engine uses a cast iron block for durability, while the Cayenne’s engines use an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

Engine

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The Grand Cherokee SRT’s 6.4 V8 produces 140 more horsepower (475 vs. 335) and 138 lbs.-ft. more torque (470 vs. 332) than the Cayenne’s standard 3.0 turbo V6. The Grand Cherokee SRT’s 6.4 V8 produces 41 more horsepower (475 vs. 434) and 64 lbs.-ft. more torque (470 vs. 406) than the Cayenne S’ standard 2.9 turbo V6. The Grand Cherokee SRT’s 6.4 V8 produces 20 more horsepower (475 vs. 455) than the Cayenne E-Hybrid’s standard 3.0 turbo V6 hybrid.

As tested in Motor Trend the Jeep Grand Cherokee SRT is faster than the Porsche Cayenne turbo V6:

Grand Cherokee SRT

Cayenne

Zero to 60 MPH

4.4 sec

5.1 sec

Quarter Mile

13.1 sec

13.7 sec

Speed in 1/4 Mile

103.6 MPH

100.7 MPH

Fuel Economy and Range

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An engine control system that can shut down half of the engine’s cylinders helps improve the Grand Cherokee SRT’s fuel efficiency. The Cayenne doesn’t offer a system that can shut down part of the engine.

The Grand Cherokee SRT has 4.8 gallons more fuel capacity than the Cayenne E-Hybrid’s standard fuel tank (24.6 vs. 19.8 gallons), for longer range between fill-ups. The Grand Cherokee SRT has almost a gallon more fuel capacity than the Cayenne’s standard fuel tank (24.6 vs. 23.7 gallons).

The Grand Cherokee SRT has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The Cayenne doesn’t offer a cap-less fueling system.

Brakes and Stopping

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For better stopping power the Grand Cherokee SRT’s standard brake rotors are larger than those on the Cayenne:

Grand Cherokee SRT

Cayenne

Front Rotors

15 inches

13.8 inches

Rear Rotors

13.8 inches

13 inches

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The Grand Cherokee SRT has a standard brake assist system to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Cayenne doesn’t offer a brake assist feature.

Tires and Wheels

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For better traction, the Grand Cherokee SRT has larger tires than the Cayenne (295/45R20 vs. 255/55R19). The Grand Cherokee SRT’s tires are larger than the largest tires available on the Cayenne (295/45R20 vs. 285/40R21).

The Grand Cherokee SRT’s tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the Cayenne’s standard 55 series front and 50 series rear tires.

For better ride, handling and brake cooling the Grand Cherokee SRT has standard 20-inch wheels. Smaller 19-inch wheels are standard on the Cayenne.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the Grand Cherokee SRT can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Cayenne doesn’t offer run-flat tires.

The Grand Cherokee SRT offers an optional full size spare tire so a flat doesn’t interrupt your trip. A full size spare isn’t available on the Cayenne, it requires you to depend on a temporary spare, which has mileage and speed limitations, or roadside assistance and a tow-truck.

Suspension and Handling

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For better maneuverability, the Grand Cherokee SRT’s turning circle is 1.8 feet tighter than the Cayenne’s (38 feet vs. 39.8 feet).

Chassis

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The Grand Cherokee SRT is 3.9 inches shorter than the Cayenne, making the Grand Cherokee SRT easier to handle, maneuver and park in tight spaces.

The Grand Cherokee SRT uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The Cayenne doesn’t offer active noise cancellation.

Cargo Capacity

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The Grand Cherokee SRT has a much larger cargo volume with its rear seat up than the Cayenne with its rear seat up (36.3 vs. 27.1 cubic feet). The Grand Cherokee SRT has a much larger cargo volume with its rear seat folded than the Cayenne with its rear seat folded (68.3 vs. 60.3 cubic feet).

Payload

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The Grand Cherokee SRT has a much higher standard payload capacity than the Cayenne (1350 vs. 1104 lbs.).

Ergonomics

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The Grand Cherokee SRT has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Cayenne doesn’t offer a remote starting system.

The Grand Cherokee SRT’s standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. An easy entry system costs extra on the Cayenne.

On a hot day the Grand Cherokee SRT’s driver can lower the front windows from a distance using the keyless remote. The driver of the Cayenne can only operate the windows from inside the vehicle, with the ignition on.

The Grand Cherokee SRT’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The Cayenne’s cruise control switches are unlit, making them difficult to find at night and operate safely.

To improve rear visibility by keeping the rear window clear, the Grand Cherokee SRT has a standard rear fixed intermittent wiper with a full on position. The rear wiper standard on the Cayenne only has an intermittent setting, so in a hard rain visibility isn’t as good.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the Grand Cherokee SRT has standard extendable sun visors. The Cayenne doesn’t offer extendable visors.

The Grand Cherokee SRT has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the vehicle heater warms up. A heated steering wheel costs extra on the Cayenne.

The Grand Cherokee SRT has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Cayenne doesn’t offer a house-current electrical outlet.

Economic Advantages

© 1999 - 2019 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2019/10/16

Insurance will cost less for the Grand Cherokee SRT owner. The Complete Car Cost Guide estimates that insurance for the Grand Cherokee SRT will cost $3700 to $8520 less than the Cayenne over a five-year period.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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