2020 Honda Civic Si vs. 2019 Porsche 718 Cayman

Detailed Review, Specifications & Comparison

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Safety

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For enhanced safety, the front seat shoulder belts of the Honda Civic Si Sedan are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Porsche 718 Cayman doesn’t offer height-adjustable seat belts.

Using vehicle speed sensors and seat sensors, smart airbags in the Civic Si deploy with different levels of force or don’t deploy at all to help better protect passengers of all sizes in different collisions. The Civic Si’s side airbags will shut off if a child is leaning against the door. The 718 Cayman’s airbags don’t have smart features and will always deploy full force.

The Civic Si’s 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.

Both the Civic Si and the 718 Cayman have standard driver and passenger frontal airbags, front side-impact 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.

Warranty

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Honda’s powertrain warranty covers the Civic Si 1 year and 10,000 miles longer than Porsche covers the 718 Cayman. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 5 years or 60,000 miles. Coverage on the 718 Cayman ends after only 4 years or 50,000 miles.

There are almost 6 times as many Honda dealers as there are Porsche dealers, which makes it much easier should you ever need service under the Civic Si’s warranty.

Reliability

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The 718 Cayman’s redline is at 7500 RPM, which causes more engine wear, and a greater chance of a catastrophic engine failure. The Civic Si has a 6500 RPM redline.

To reliably start during all conditions and help handle large electrical loads, the Civic Si has a standard 500-amp battery. The 718 Cayman’s 340-amp battery isn’t as powerful.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the Civic Si’s reliability 12 points higher than the 718 Cayman.

Fuel Economy and Range

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On the EPA test cycle the Civic Si gets better fuel mileage than the 718 Cayman:

MPG

Civic Si

Manual

1.5 turbo 4-cyl.

26 city/36 hwy

718 Cayman

Manual

2.0 turbo 4-cyl.

21 city/28 hwy

S 2.5 turbo 4-cyl.

20 city/26 hwy

GTS 2.5 turbo 4-cyl.

19 city/25 hwy

Auto

2.0 turbo 4-cyl.

22 city/29 hwy

S 2.5 turbo 4-cyl.

21 city/28 hwy

GTS 2.5 turbo 4-cyl.

20 city/26 hwy

To lower fuel costs and make buying fuel easier, the Honda Civic Si uses regular unleaded gasoline (premium recommended for maximum performance). The 718 Cayman requires premium, which can cost 20 to 55 cents more per gallon.

The Civic Si 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 718 Cayman doesn’t offer a cap-less fueling system.

Tires and Wheels

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The Civic Si’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the 718 Cayman’s standard 45 series tires.

Suspension and Handling

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The Civic Si’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The 718 Cayman doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the Civic Si’s wheelbase is 8.9 inches longer than on the 718 Cayman (106.3 inches vs. 97.4 inches).

Chassis

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As tested by Car and Driver, the interior of the Civic Si Coupe is quieter than the 718 Cayman:

Civic Si

718 Cayman

At idle

40 dB

54 dB

Full-Throttle

84 dB

88 dB

70 MPH Cruising

72 dB

76 dB

Passenger Space

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The Civic Si has standard seating for 5 passengers; the 718 Cayman can only carry 2.

The Civic Si Coupe has 40.6 cubic feet more passenger volume than the 718 Cayman (88.6 vs. 48).

The Civic Si Coupe has .1 inches more front legroom and 5.6 inches more front shoulder room than the 718 Cayman.

Cargo Capacity

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A low lift-over trunk design makes loading and unloading the Civic Si easier. The Civic Si’s trunk lift-over height is 26.8 inches, while the 718 Cayman’s liftover is 32.7 inches.

Ergonomics

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The Civic Si’s standard power windows have a locking feature to keep children from operating them. Porsche does not offer a locking feature on the 718 Cayman’s standard power windows.

If the windows are left open on the Civic Si the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. The driver of the 718 Cayman can only operate the windows from inside the vehicle, with the ignition on.

The Civic Si’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 718 Cayman’s cruise control switches are unlit, making them difficult to find at night and operate safely.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the Civic Si has standard extendable sun visors. The 718 Cayman doesn’t offer extendable visors.

The Civic Si 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.

Model Availability

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The Honda Civic Si comes in coupe and sedan bodystyles; the Porsche 718 Cayman isn’t available as a sedan.

Economic Advantages

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Insurance will cost less for the Civic Si owner. The Complete Car Cost Guide estimates that insurance for the Civic Si will cost $1100 less than the 718 Cayman over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Honda Civic Si will be $22841 to $37735 less than for the Porsche 718 Cayman.

Recommendations

© 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

Consumer Reports® recommends the Honda Civic Si, based on reliability, safety and performance.

A group of representative automotive journalists from North America selected the Civic as the 2016 North American Car of the Year. The 718 Cayman has never been chosen.

The Honda Civic outsold the Porsche Cayman by over 102 to one during 2018.

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

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