Review: Mercedes-AMG C253 GLC Coupe (2016-23)

Review: Mercedes-AMG C253.I GLC 43 & 63 S (2016-19)

Overview

Commencing production in December 2016, the Mercedes-AMG C253 GLC 43 Coupe was a mid-size SUV with a raked roofline. Manufactured in Bremen, Germany, the all-wheel drive Mercedes-AMG C253 GLC 43 was powered by a 3.0-litre biturbo V6 petrol engine that was mated to a nine-speed automatic transmission (Mercedes’ ‘9G-Tronic’).

While production of the Mercedes-AMG GLC 63 S Coupe commenced production in September 2017, AustralianCar.Reviews understands that right-hand drive production commenced on 11 October 2017. The GLC 63 S was powered by a 4.0-litre biturbo V8 petrol engine that was mated to a nine-speed semi-automatic transmission.

GLC 43: Biturbo M276 V6 engine and 9G-Tronic transmission

The Mercedes-AMG GLC 43 was powered by the 2996 cc M276 V6 petrol engine which had an aluminium alloy block and cylinder head, ‘Nanoslide’ cylinder wall coatings, a forged steel crankshaft, an IHI turbocharger for each cylinder bank which provided peak boost pressure of 1.1 bar, double overhead camshafts (chain-driven), independent intake and exhaust camshaft adjustment, four valves per cylinder, direct injection via piezo injectors at a pressure of up to 200 bar, a variable-resonance intake manifold and a compression ratio of 10.7:1.

To reduce fuel consumption, the M276 engine had an ECO start/stop function which enabled it to shut down when the GLC 43 was stationary in traffic. Over the combined ADR 81/02 test cycle, fuel consumption for the Mercedes-AMG X253 GLC 43 was 8.9 litres per 100 km.

For the Mercedes-AMG GLC 43, Mercedes developed unique software for the 9G-Tronic transmission to deliver faster gearshifts. The transmission had a multiple downshift function and the driver could select from Eco, Comfort, Sport, Sport Plus and Manual modes for different transmission gearshift mapping and shift speeds. In ‘Eco’ mode, the clutch could disengage to decouple the engine from the powertrain when the driver released the accelerator and the GLC 43 was travelling between 60 km/h and 160 km/h; when this occurred, engine speed was reduced to idle and the driving resistance was reduced by the compression and frictional forces of the engine in over-run mode.

In the ‘Sport’ and ‘Sport Plus’ modes, the 9G-Tronic transmission provided:

• A double-declutching function; and,
• Ignition adjustments for faster gearshifts.

In Manual mode, the driver could change gear using the paddles on the steering wheel and the transmission would stay in the selected gear until engine speed reached its rpm limit.

The Mercedes-AMG GLC 43 Coupe could accelerate from rest to 100 km/h in 4.9 seconds.

GLC 63 S: Biturbo M177 V8 engine and AMG Speedshift MCT 9-speed transmission

Assembled by hand in Affalterbach, the 3982 cc M177 V8 engine for the GLC 63 S had a cast aluminium closed-deck block, ‘Nanoslide’ cylinder wall coatings, zirconium alloy cylinder heads, two turbochargers mounted within the engine’s ‘V’ providing maximum boost pressure of 1.2 bar (17.4 psi), double overhead camshafts, variable inlet and exhaust valve timing, four valves per cylinder, direct fuel injection via piezo injectors, a compression ratio of 10.5:1 and dry sump lubrication.

Like the biturbo M276 engine, the M177 V8 engine had an ‘ECO start/stop’ function. Furthermore, the clutch of the AMG Speedshift transmission could open when the ‘Comfort’ drive mode was selected to decouple the engine from the drivetrain if the driver lifted their foot off the accelerator at speeds between 60 km/h and 160 km/h.

The nine-speed ‘AMG Speedshift MCT’ (Multi Clutch Technology) had multiple clutches that were placed together and controlled separately. As such, the AMG Speedshift MCT had a compact, wet start-up clutch that operated in an oil bath rather than a conventional torque converter; unlike double clutch transmissions, the SpeedShift MCT had a single input shaft. Features of the AMG Speedshift transmission included:

• Automatic throttle-blipping on downshifts;
• A double-declutching function for multiple downshifts;
• A ‘sailing’ function. When the driver releases the accelerator at speeds between 60 km/h and 160 km/h, the clutch of the MCT opens to decouple the engine from the powertrain. Furthermore, electronics reduce engine speed to idling level and motion resistance is reduced by the compression and frictional forces of the engine in overrun mode; and,
• A ‘Race Start’ function.

4MATIC all-wheel drive systems

For the Mercedes-AMG C253 GLC 43, the ‘4MATIC’ all-wheel drive system utilised a centre planetary differential and multiple-disc clutch, with the single-stage transfer case flange-mounted on the nine-speed ‘9G Tronic’ automatic transmission. In normal conditions, the 4MATIC system provided a 31:69 front:rear torque split (compared to 45:55 for the Mercedes-Benz X253 GLC ).

For the Mercedes-AMG C253 GLC 63 S, the ‘4MATIC+’ permanent all-wheel drive system utilised an electromechanically controlled coupling to connect the permanently driven rear axle to the front axle. According to Mercedes,

• The optimum front:rear torque distribution was continuously calculated according to the driving conditions and driver’s input; and,
• The torque distribution for the front and rear axles was fully variable.

The Mercedes-AMG C253 GLC 63 S was also fitted with an electronically controlled rear-axle limited slip differential (LSD).

Dimensions

The Mercedes-AMG GLC 43 Coupe was 4737 mm long, 1890 mm wide, 1605 mm tall and had a 2873 mm long wheelbase. For Australian-delivered vehicles, the Mercedes-AMG GLC 43 Coupe had a tare mass of 1889 kg.

Suspension

The Mercedes-AMG C253 GLC Coupe had four-link front suspension and a five-link rear axle, both with coil springs, gas-filled shock absorbers (twin tube units for the front axle) and torsion bar stabilisers.

Compared to the Mercedes-Benz C253 GLC , the front-axle for the Mercedes-AMG GLC 43 was fitted with special steering knuckles and load-bearing joints on the spring link; negative camber was also increased for both front and rear axles. Furthermore, the suspension included Mercedes-Benz’s ‘Air Body Control’ multi-chamber air suspension which consisted of:

• Two chambers of different sizes in the spring struts of the front axle; and,
• Three chambers of different sizes in the spring struts of the rear axle.

The Air Body Control suspension adjusted, in three stages, how stiffly the suspension reacted. Air Body Control also included a continuously operating, electronically controlled damping adjustment system which adjusted damping at each individual wheel according to the driving situation (including evasive manoeuvres) and road conditions.

The Air Body Control suspension included all-round self-levelling which adjusted ride height according to vehicle speed, enabling it to reduce the vehicle’s aerodynamic drag and therefore fuel consumption. When driving on rough roads, ground clearance could also be increased via the ride height adjustment switch. Furthermore, the ‘ADS Plus’ adaptive damping system enabled the driver to select from ‘Comfort’, ‘Sport’ and ‘Sport Plus’ modes.

Steering

The Mercedes-AMG GLC 43 and 63 S had rack-and-pinion steering with electric power assistance.

Safety equipment

Standard safety equipment for the Mercedes-AMG C253 GLC 43 and GLC 63 S Coupes included dual front airbags, a driver’s knee airbag, front and rear side (thorax/pelvic) airbags, full-length curtain airbags, ABS, electronic brake force distribution, brake assist, electronic stability control, traction control and front seatbelts with pre-tensioners and load limiters.

Beyond this, the Mercedes-AMG C253 GLC 43 and GLC 63 S Coupes were also fitted with the following technologies –

• Collision Prevention Assist Plus (radar-based collision warning with autonomous braking and adaptive Brake Assist): operating at speeds up to 250 km/h to monitor the traffic ahead and at speeds up to 70 km/h for stationary objects, Collision Prevention Assist would issue a visual warning (when driving at speeds over 7 km/h) and an optical warning (when driving at speeds over 30 km/h if there was a collision risk. At speeds below 105 km/h (250 km/h in conjunction with Distronic Plus), Collision Prevention Assist Plus would initially provide partial autonomous braking to reduce vehicle speed and alert the driver. Furthermore, adaptive Brake Assist would calculate the braking force required and prime the braking system for optimum response when the driver depressed the brake pedal. If the driver did not respond and a collision was unavoidable, then maximum braking force would be applied to reduce vehicle speed. At initial vehicle speeds of up to 40 km/h, rear-end collisions could be prevented;
• BAS Plus with Cross-Traffic Assist: used a 24 GHz radar sensor with a range of 30 metres and a 77 GHz radar sensor with a range of 200 metres to monitor the distance to the vehicle ahead and would warn the driver if there was a risk of a collision. Brake Assist Plus could detect vehicles when travelling at speeds up to 200 km/h, and stationary objects when the driver was travelling at 7 km/h to 72 km/h. Significantly, Brake Assist Plus could calculate the necessary brake force assistance to prevent a rear-end collision, build up that pressure in the braking system and provide it as soon as the brake pedal was depressed for ‘the best possible deceleration’. The Cross-Traffic Assist function could operate at speeds up to 72 km/h and used the stereo camera and radar sensors to detect traffic that was crossing in front of or behind the vehicle. If detected, the driver would receive visual and audible alerts;
• Distronic Plus (adaptive cruise control with brake warning): an ‘adaptive’ cruise control system which used two short-range radar sensors positioned behind the front bumper to monitor the road up to 30 metres ahead, and a long-range radar located behind the radiator grille which had a range of 200 metres. Operating at speeds up to 200 km/h, Distronic Plus used an electronic control unit to analyse the information from both radar systems to calculate the engine, automatic transmission and braking parameters required for proximity control. As such, Distronic Plus could automatically apply the brakes to prevent the vehicle from becoming too close to traffic ahead (the time interval could be specified) and accelerate back to the set speed when traffic allowed. To accelerate from rest, the driver only needed to operate the Distronic stalk on the steering column or briefly depress the accelerator pedal. With Distronic Plus, automatic deceleration of up to four (4) m/s²was possible. If Distronic Plus detected that heavier braking was required, a warning light would illuminate in the instrument cluster and be accompanied by an audible warning. Furthermore, the electronic proximity control system could be activated independently of Distronic Plus at speeds over 30 km/h to alert the driver if they were approaching another vehicle too rapidly;
• Steering Assist with Stop&Go Pilot: operating in conjunction with Distronic Plus and at speeds up to 130 km/h, Steering Assist used a stereo camera located behind the windscreen to detect road markings, while the Stop&Go Pilot operated at speeds up to 60 km/h and enabled the system to use the vehicle in front or road markings as a means of orientation. If the vehicle was detected to be drifting out of its lane, Steering Assist would warn the driver and provide steering intervention to keep the vehicle in its lane;
• Pre-Safe: prepared the vehicle for a collision by deploying the seatbelt tensioners, closing the side windows and sunroof (where fitted) and adjusting the front seats for optimum deployment of the restraint system. Pre-Safe was activated by emergency braking, panic braking, pronounced over- or under-steering, critical steering movements or heavy support by the adaptive Brake Assist system;
• Pre-Safe Plus: could anticipate rear-end collisions and warn following traffic by activating the rear hazard lights at high frequency. The Pre-Safe system would then deploy occupant protection measures and apply the vehicle’s brakes to prevent secondary accidents;
• Active Blind Spot Assist: active at speeds above 60 km/h, a corrective braking force is applied to the wheels on one side of the vehicle if the driver attempts to change lanes when a vehicle is detected in the driver’s blind spot;
• Active Lane Keeping Assist: vibrates the steering wheel as the vehicle approaches a continuous lane marking line and, if crossed, automatically brakes the wheels on one side of the vehicle to return the vehicle to its lane;
• Attention Assist with drowsiness detection: operates at speeds in excess of 80 km/h and assesses driver behaviour (including steering movements) for signs of drowsiness. If detected, the driver is provided with visual and audible warnings; and,
• An ‘active’ bonnet which would prior to a pedestrian collision to reduce the severity of the pedestrian’s impact with the bonnet.

Euro NCAP testing

In Euro NCAP testing , the related 2015 Mercedes-AMG X253 GLC 220 d 4MATIC received a five star safety rating which included a 95 per cent adult occupant protection rating and an 89 per cent child occupant rating. In the frontal offset test, occupant protection was generally rated as good, although chest and lower right leg protection was rated as adequate (i.e. a slight risk of serious injury). In the side impact and pole tests, however, maximum points were awarded.

Wheels, tyres and brakes

The Mercedes-AMG C253 GLC 43 Coupe had 21-inch AMG twin-spoke alloy wheels in bi-colour black. While the GLC 43 Coupe had 8.5J x 21-inch front wheels with 255/40 ZR21 tyres, there were 9.5J x 21-inch rear wheels with 285/35 ZR21 tyres. Furthermore, the Mercedes-AMG C253 GLC 43 had 360 mm by 36 mm ventilated front brake discs and 320 mm by 24 mm ventilated rear disc brakes.

The Mercedes-AMG C253 GLC 63 S Coupe, however, had 21-inch AMG five-twin-spoke alloy wheels painted in black. The 9.5J x 21-inch front wheels had 265/40 ZR21 tyres, while the 10.0J x 21-inch rear wheels had 295/35 ZR21 tyres.

Features: Mercedes-AMG C253 GLC 43 Coupe

The Mercedes-AMG C253 GLC 43 Coupe was equipped with Mercedes’ ‘COMAND Online’ media system which included a 21.3 cm TFT display, HDD navigation with real-time traffic updates, a CD/DVD player, 10 GB music register, Bluetooth interface for mobile phone connectivity and audio streaming, ‘Linguatronic’ voice recognition and internet access.

Other standard features for the Mercedes-AMG C253 GLC 43 Coupe included a 590 watt Burmester surround sound system with thirteen speakers and a nine-channel digital sound processing (DSP) amplifier, a digital radio tuner (DAB+), a Garmin satellite navigation system, leather upholstery, power adjustable and heated front sports seats, ‘Thermatic’ dual-zone climate control air conditioning, cruise control with variable speed limiter (‘Speedtronic’), dusk-sensing headlights, rain-sensing wipers, a head-up display, a leather-wrapped steering wheel with gearshift paddles, 40:20:40 split fold rear seats, remote central locking with proximity key, power adjustable and heated door mirrors with folding function, power windows, a power adjustable steering column (for height and reach), driver memory settings (for the seat and door mirrors), push-button start, an electric park brake, an auto-dimming rear view mirror, ambient interior lighting, illuminated front door sill panels, reading lights (front and rear), a glass sunroof with heat-insulating glass, brushed stainless steel AMG sports pedals, brushed aluminium side steps, a cargo cover, tyre pressure monitoring, a trip computer, an alarm and immobiliser.

As standard, the Mercedes-AMG C253 GLC 43 Coupe was equipped with LED headlights and Mercedes-Benz’s ‘LED Intelligent Light System’ which provided variable lighting and five selectable programs: motorway mode, cornering light function, camera-based active light function, roundabout light function and enhanced fog light function. The system also included ‘Adaptive Highbeam Assist Plus’ which automatically dipped the high beam headlights when traffic was detected to avoid dazzling other drivers.

Finally, the C253 GLC 43 Coupe was also equipped with:

• A 360 degree camera system which provided a bird’s eye view of the vehicle on the centre display and dynamic guidelines; and,
• Parking Pilot with Parking Assist: automatically engaged when driving at speeds up to 30 km/h, Parking Pilot could identify parallel and right angle parking spaces. Furthermore, the Parking Assist function could provide automated steering to manoeuvre the vehicle into the space while the driver controlled vehicle speed.

Features: Mercedes-AMG C253 GLC 63 S Coupe

Compared to the Mercedes-AMG C253 GLC 43 Coupe, the GLC 63 S Coupe was further equipped with a digital TV tuner, AMG Performance seats (though these omitted the power adjustable headrest and seat cushion extension adjustment of the GLC 43 seats), three-zone ‘Thermotronic’ climate control air conditioning, black Nappa leather upholstery, an AMG Performance steering wheel in Nappa leather and ‘Dinamica’ microfibre, ‘Artico’ synthetic leather trim for the dashboard and beltlines, an AMG instrument cluster and ‘Air Balance’ package (included ionisation, improved air filtration and fragrancing).

Visually, the GLC 63 S Coupe could be identified by its:

• AMG ‘Panamericana’ grille which had vertical black louvres and a high-gloss chrome trim strip;
• Front apron with a jet wing design and front splitter;
• Rear apron with diffuser fins and diffuser board with black trim strip;
• AMG black side skill panels (running boards omitted); and,
• AMG spoiler lip.

Specifications

• Specifications: Mercedes-Benz C253 GLC Coupe (April 2017)
• Specifications: Mercedes-Benz C253 GLC Coupe (July 2017)

Review: Mercedes-AMG C253.II GLC Coupe (2019-23)

Overview

The Mercedes-AMG C253.II GLC 43 and GLC 63 S Coupes were released in Australia in September 2019.

Inside, the C253.II GLC featured the ‘Mercedes-Benz User Experience’ (MBUX) infotainment system. For Australian-delivered vehicles, MBUX included a 10.25 inch diameter (1920 x 720 pixels) central touchscreen, a 12.3-inch instrument display for the instruments and a multi-functional touchpad on the centre console (replacing the rotary push-button). The new steering wheel also had touch-sensitive controls which enabled the driver to control both MBUX displays.

Visually, the Mercedes-AMG C253.II GLC 43 and GLC 63 S could be identified by their smaller and more raked LED headlamps with modified contours, revised rear bumper and exhaust tips, redesigned LED tail lamps and ‘AMG Night Package’ of black trim enhancements.

Safety equipment

Compared to the Mercedes-AMG C253.I GLC, passive safety technologies for the C253.II GLC were unchanged.

The Mercedes-AMG C253.II GLC 43 and GLC 63 S were equipped with the following active safety technologies –

• Active Brake Assist (previously ‘Collision Prevention Assist Plus’);
• Blind Spot Assist (passive);
• Rear Cross-Traffic Alert;
• Pre-Safe accident anticipatory system;
• Traffic Sign Assist; and,
• Attention Assist.

Furthermore, the Mercedes-AMG C253.II GLC 43 and GLC 63 S were equipped with a ‘Driver Assistance Package’ – as standard – which included the following –

• Active Distance Assist Distronic with Active Steering Assist: operating at speeds up to 210 km/h, the system could maintain a pre-set distance to the vehicle ahead. A stop-and-go function also enabled the vehicle to be braked until stationary, remain stationary for up to 30 seconds and then accelerate when the traffic ahead started moving. Active Distance Assist Distronic also combined navigation data with camera/radar inputs to adjust speed when approaching bends, junctions or roundabouts. Active Steering Assist helped the driver in keeping the vehicle in the centre of its lane by applying steering wheel torque, using lane markings for orientation at speeds up to 210 km/h and, at speeds up to 130 km/h, also used the position of vehicles ahead;
• The Cross-Traffic Assist: operated at speeds up to 72 km/h and used the stereo camera and radar sensors to detect traffic that was crossing in front of or behind the vehicle. If detected, the driver would receive visual and audible alerts;
• Evasive Steering Assist: operating at speeds from 20-70 km/h, Evasive Steering Assist could help the driver avoid a pedestrian that was detected by the radar sensors and stereo camera. If the driver initiated an evasive manoeuvre by turning the steering wheel, the system provided ‘precisely calculated steering torque to support the movement of the steering wheel’ to avoid the pedestrian and then straighten the vehicle;
• Active Lane Keeping Assist: operating at speeds from 60 km/h to 200 km/h, Active Lane Keeping Assist warned the driver if the vehicle was unintentionally drifting out of its lane via pulsed vibrations through the steering wheel. If the vehicle crossed a continuous line, the system could pull the vehicle back into its lane by applying the brakes on one side of the vehicle. In the case of a broken line, such intervention would occur only when there was a collision risk with a vehicle in the adjacent lane (including oncoming traffic);
• Active Lane Change Assist: operating at speeds from 80 km/h to 180 km/h, Active Lane Change Assist could perform lane changes – within 10 seconds – in response to the driver nudging the indicator stalk;
• Active Blind Spot Assist: at speeds from 12 km/h to 200 km/h, the system could provide a visual alert and audible alarm if there was a risk of a side collision when the turn indicator was actuated. As part of the Driving Assistance Package, the brakes on one side of the vehicle could be applied when travelling at speeds above 30 km/h to avoid a side collision; and,
• Pre-Safe Plus: used the rear radar sensors to detect if a rear-end collision was imminent and, if so, flashed the rear hazard lights and prepared occupant protection measures such as the seatbelt tensioners. If the vehicle was stationary and the risk of a collision persisted, the system could apply the vehicle’s brakes to reduce the risk of injuries by reducing the forward jolt caused by an impact from the rear.

Features: Mercedes-AMG C253.II GLC 43 and 63 S

Selected features for the Mercedes-AMG C253.II GLC 43 and 63 S included a Burmester surround sound system, leather upholstery, three-stage heated front seats with memory settings, Multi-Beam LED headlights with Adaptive Highbeam Assist Plus, head-up display with virtual image projection, a proximity key and push-button start (‘Keyless Go’), ambient lighting, illuminated front door sill panels with ‘AMG’ lettering, two USB ports in the second row of seating, wireless charging for compatible mobile devices and rear privacy glass.

For a complete list of features, please see the ‘Specifications’ document, below.

Specifications

• Specifications: Mercedes-Benz X253/C253 GLC SUV and Coupe (September 2019)