2019 Audi TT vs. 2019 Mercedes SLC

Detailed Review, Specifications & Comparison

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Safety

The TT has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The SLC doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

The TT has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The SLC doesn’t offer all-wheel drive.

Both the TT and the SLC 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, rearview cameras and available blind spot warning systems.

Warranty

The TT’s corrosion warranty is 7 years longer than the SLC’s (12 vs. 5 years).

Reliability

J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 6 more problems per 100 vehicles, Mercedes is ranked 15th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 10 places higher in reliability than Mercedes.

Engine

The TT RS Coupe’s 2.5 turbo 5 cyl. produces 15 more horsepower (400 vs. 385) than the AMG SLC 43’s optional 3.0 turbo V6.

Environmental Friendliness

The U.S. Environmental Protection Agency (EPA) certifies the Audi TT at emission levels ranging from “Ultra Low Emissions Vehicle” (ULEV) to “Super Ultra Low Emissions Vehicle” (SULEV). The Mercedes SLC is only certified to “Ultra Low Emissions Vehicle” (ULEV) standards.

Transmission and Drivetrain

The TT offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The SLC doesn’t offer an SMG or a conventional manual transmission.

All wheel drive, available in the TT, 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 Mercedes SLC is not available with all wheel drive.

The TT RS’ launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The SLC doesn’t offer launch control.

Brakes and Stopping

For better stopping power the TT’s brake rotors are larger than those on the SLC:

 

TTS

TT RS

SLC 300

AMG SLC 43

Front Rotors

13.3 inches

14.6 inches

12.7 inches

14.2 inches

The TT RS offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The SLC doesn’t offer ceramic brake rotors.

Tires and Wheels

For better traction, the TT has larger standard tires than the SLC (245/40R18 vs. 225/45R17). The TTS/RS’ optional tires are larger than the largest tires available on the SLC (255/30R20 vs. 235/40R18).

The TT 45 TSFI’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 SLC 300’s standard 45 series front tires. The TTS/RS’ optional tires have a lower 30 series profile than the SLC’s optional 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the TT 45 TSFI has standard 18-inch wheels. Smaller 17-inch wheels are standard on the SLC 300. The TTS/RS’ optional 20-inch wheels are larger than the 18-inch wheels optional on the SLC.

Suspension and Handling

For a smoother ride and more stable handling, the TT’s wheelbase is 2.9 inches longer than on the SLC (98.6 inches vs. 95.7 inches).

Chassis

The design of the Audi TT amounts to more than styling. The TT offers aerodynamic coefficients of drag from .3 to .32 Cd (depending on bodystyle and options). That is lower than the SLC (.33 to .36). A more efficient exterior helps the TT go faster and keeps the interior quieter. It also helps the TT get better fuel mileage.

Passenger Space

The TT Coupe has standard seating for 4 passengers; the SLC can only carry 2.

Cargo Capacity

The TT Roadster has a much larger trunk than the SLC with its top down (7.5 vs. 6.4 cubic feet).

Servicing Ease

J.D. Power and Associates surveys of service recipients show that Audi service is better than Mercedes. J.D. Power ranks Audi third in service department satisfaction. With a 3% lower rating, Mercedes is ranked 6th.

Ergonomics

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi TT has a standard wireless phone charging system (Qi) in the center console. The SLC doesn’t offer wireless personal charging.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi TT has a standard wireless phone charging system (Qi) in the center console. The SLC doesn’t offer wireless personal charging.

Model Availability

The Audi TT comes in coupe and convertible bodystyles; the Mercedes SLC isn’t available as a coupe.

Recommendations

Consumer Reports® recommends the Audi TT, based on reliability, safety and performance.

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

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