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The RS 5’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 718 Cayman doesn’t offer pre-crash pretensioners.
The RS 5’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The 718 Cayman doesn’t offer a whiplash protection system.
The RS 5 has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The 718 Cayman doesn’t offer all-wheel drive.
The RS 5’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The 718 Cayman doesn’t offer a lane departure warning system.
The RS 5 offers an optional Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The 718 Cayman only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
To help make backing safer, the RS 5’s cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The 718 Cayman doesn’t offer a cross-path warning system.
Both the RS 5 and the 718 Cayman have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.
The Audi RS 5 weighs 914 to 1024 pounds more than the Porsche 718 Cayman. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.
There are over 59 percent more Audi dealers than there are Porsche dealers, which makes it much easier should you ever need service under the RS 5’s warranty.
The 718 Cayman’s redline is at 7500 RPM, which causes more engine wear, and a greater chance of a catastrophic engine failure. The RS 5 has a 6500 RPM redline.
To reliably start during all conditions and help handle large electrical loads, the RS 5 has a standard 420-amp battery. The 718 Cayman’s 340-amp battery isn’t as powerful.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Porsche vehicles. Consumer Reports ranks Audi 4 places higher in reliability than Porsche.
The RS 5’s 2.9 turbo V6 produces 144 more horsepower (444 vs. 300) and 163 lbs.-ft. more torque (443 vs. 280) than the 718 Cayman’s standard 2.0 turbo 4 cyl. The RS 5’s 2.9 turbo V6 produces 94 more horsepower (444 vs. 350) and 134 lbs.-ft. more torque (443 vs. 309) than the 718 Cayman S’ standard 2.5 turbo 4 cyl. The RS 5’s 2.9 turbo V6 produces 79 more horsepower (444 vs. 365) and 134 lbs.-ft. more torque (443 vs. 309) than the 718 Cayman GTS’ standard 2.5 turbo 4 cyl. The RS 5’s 2.9 turbo V6 produces 79 more horsepower (444 vs. 365) and 126 lbs.-ft. more torque (443 vs. 317) than the 718 Cayman GTS’ optional 2.5 turbo 4 cyl.
The RS 5 has 1.1 gallons more fuel capacity than the 718 Cayman’s standard fuel tank (15.3 vs. 14.2 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi RS 5 higher (5 out of 10) than the Porsche 718 Cayman (3). This means the RS 5 produces up to 16.5 pounds less smog-producing pollutants than the 718 Cayman every 15,000 miles.
The Audi RS 5 comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 718 Cayman.
An eight-speed automatic is standard on the Audi RS 5, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 718 Cayman.
All-wheel drive, available in the RS 5, provides the best traction for acceleration in wet, dry, and icy conditions. In corners, all-wheel drive allows both outside wheels to provide power, balancing the car. This allows for better handling. The Porsche 718 Cayman is not available with all-wheel drive.
For better stopping power the RS 5’s brake rotors are larger than those on the 718 Cayman:
For better traction, the RS 5 has larger standard tires than the 718 Cayman (265/35R19 vs. 235/45R18). The RS 5’s optional tires are larger than the largest tires available on the 718 Cayman (275/30R20 vs. 245/35R20).
The RS 5’s standard tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the 718 Cayman’s standard 45 series tires. The RS 5’s optional tires have a lower 30 series profile than the 718 Cayman’s optional 35 series front tires.
For better ride, handling and brake cooling the RS 5 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the 718 Cayman.
For a smoother ride and more stable handling, the RS 5’s wheelbase is 11.5 inches longer than on the 718 Cayman (108.9 inches vs. 97.4 inches).
For better handling and stability, the track (width between the wheels) on the RS 5 is 3.1 inches wider in the front and 2.1 inches wider in the rear than the average track on the 718 Cayman.
The RS 5 has standard seating for 4 passengers; the 718 Cayman can only carry 2.
The RS 5 has 36 cubic feet more passenger volume than the 718 Cayman (84 vs. 48).
With its coupe body style, valet key, locking rear seatbacks and remote trunk release lockout, the RS 5 offers cargo security. The 718 Cayman’s hatchback body style and non-lockable remote release defeat cargo security.
The RS 5 offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The 718 Cayman doesn’t offer a heads-up display.
If the windows are left open on the RS 5 the driver can close them all at the outside door handle. On a hot day the driver can also lower the windows the same way. The driver of the 718 Cayman can only operate the windows from inside the vehicle, with the ignition on.
The RS 5’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The 718 Cayman’s standard manually variable intermittent wipers have to be constantly adjusted.
Heated windshield washer nozzles are standard on the RS 5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 718 Cayman doesn’t offer heated windshield washer nozzles.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the RS 5 has standard extendable sun visors. The 718 Cayman doesn’t offer extendable visors.
The RS 5 has a standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. Dual zone air conditioning costs extra on the 718 Cayman.
The RS 5’s optional Park Steering Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The 718 Cayman doesn’t offer an automated parking system.
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