Review: Audi F5 S5 Sportback (2017-on)

Overview

Production of the Audi F5 S5 Sportback commenced in October 2016 and it was officially released in Australia in March 2017. Manufactured in Ingolstadt, Germany, the all-wheel drive Audi F5 S5 Sportback was powered by a 3.0-litre turbocharged petrol engine that was mated to an eight-speed automatic transmission (Audi’s ‘Tiptronic’).

3.0 TFSI CWGD V6 engine

The Audi F5 S5 Sportback’s CWGD V6 engine had 84.5 mm bores and an 89.0 mm stroke for a capacity of 2995 cc. Key features of the CWGD engine included its aluminium alloy crankcase and cylinder head, thin-walled grey cast iron cylinder liners, aluminium pistons, four valves per cylinder, variable intake and exhaust valve timing, variable exhaust valve timing, a twin-scroll turbocharger positioned between the 90-degree ‘V’ of the cylinder banks, direct injection and compression ratio of 11.2:1. To reduce fuel consumption, the CWGD engine had:

• A Start-Stop system which enabled it to shut down as the vehicle was coming to rest; and,
• A free-wheel function which disengaged the engine from the driveline to reduce engine braking at speeds between 55 km/h and 160 km/h.

To avoid knock (i.e. uncontrolled detonation), the CWGD had a shorter compression phase relative to the expansion phase. According to Audi, the variable valvelift system enabled short intake valve opening times of 130 crankshaft degrees under part loads by closing the intake valves early. At higher loads, the inlet valves were actuated via a camshaft contour that provided a longer opening time and larger valve stroke that to maximise engine power. The CWGD engine weighed 172 kilograms.

To reduce fuel consumption,

• The CWGD engine had a Start-Stop function which enabled it to shut down as the vehicle was coming to rest; and,
• A free-wheel function disengaged the engine from the driveline to reduce engine braking at speeds between 55 km/h and 160 km/h.

The Audi S5 Sportback could accelerate from rest to 100 km/h in 4.7 seconds, while its top speed was electronically limited to 250 km/h. Over the combined ADR 81/02 test cycle, fuel consumption for the Audi S5 Sportback was 7.7 litres per 100 km.

quattro

The four-wheel drive ‘quattro’ system for the Audi F5 S5 Sportback was a purely mechanical system which utilised a self-locking central differential (designed as a planetary gear train). In normal conditions, the differential provided 60 per cent of the engine’s torque to the rear axle and 40 per cent to the front, i.e. a 40:60 front:rear torque split. Depending on the situation, however, up to 70 per cent of the engine’s torque can be transferred to the front and up to 85 per cent to the rear.

Wheel-selective torque control and sport differential

As standard, the Audi S5 Sportback had “wheel-selective torque control’. During ‘dynamic cornering’, wheel-selective torque control braked the front inner wheel (for front-wheel drive models) or front and rear inside wheels (for quattro models) to prevent wheelspin and improve turn-in.

As an extra-cost option, the S5 Sportback could be specified with a ‘sport differential’ that distributed torque between the rear wheels via two superposition gears. In this process, a software function integrated into the central chassis control unit continuously computed the ideal torque split. When turning into or accelerating in a curve, most of the torque would therefore be directed to the outside wheel to generate yaw and reduce understeer.

Body and dimensions

The Audi F5 S5 Sportback was underpinned by Volkswagen AG’s MLB platform. Compared to the Audi 8TA S5 Sportback which it replaced, the F5 Sportback was 1 mm longer (at 4752 mm), 11 mm narrower (1843 mm), 19 mm lower (1382 mm) and had a 14 mm longer wheelbase (2831 mm). Luggage capacity for the F5 S5 Sportback was 480 litres.

The Audi F5 S5 Sportback had a drag co-efficient of 0.29 Cd and an unladen weight of 1735 kg.

Suspension

The Audi F5 S5 Sportback had five-link front suspension in which the upper links were integrated into the bodywork and the lower links were attached with rubber mounts to a hybrid steel/aluminium sub-frame. For the five-link rear suspension, the axle was insulated from the body by hydraulically damped axle mounts. To reduce mass, the axle links, pivot bearings and damper stilts were made of forged aluminium.

For Australian deliveries, the Audi S5 Sportback had ‘Continuous Damping Control’ (CDC) shock absorbers as standard. These shock absorbers had electromagnetically controlled valves in their pistons to control the flow of hydraulic fluid. For the CDC system, the central suspension control unit processed inputs from sensors that measured movement and acceleration (longitudinal and transverse) to control each shock absorber individually. Furthermore, the ‘Audi drive select driving-dynamics’ system enabled the driver to select from ‘sports’ or ‘comfort’ settings.

Steering

The Audi F5 S5 Sportback had electromechanical power steering in which the level of power assistance was inversely proportional to vehicle speed. The steering had a ratio of 15.9:1, while the S5 Sportback had a turning circle of 11.7 metres.

As an extra-cost option, the Audi F5 S5 Sportback was available with ‘dynamic steering’ which varied its ratio – by up to 100 per cent – according to the vehicle speed, steering angle and the mode selected in the ‘Audi drive select driving-dynamics’ system.

Safety equipment

Standard safety equipment for the Audi F5 S5 Sportback included dual front airbags, front and rear side airbags, full-length curtain airbags (i.e. for front and rear occupants), ABS, electronic brake force distribution, brake assist, electronic stability control, traction control and front seatbelts with pre-tensioners and load limiters.

As standard, the Audi F5 S5 Sportback was fitted with:

• Audi pre sense city: operating at speeds up to 85 km/h, Audi pre sense city used a windscreen-mounted front camera to scan the road for other vehicles and pedestrians. If there was a risk of a collision, the driver received a series of warnings. If the driver failed to respond, full braking force would be applied autonomously. At initial speeds of up to 40 km/h, collisions could be prevented; at higher speeds (up to 85 km/h), the severity of the collision would be reduced;
• Audi pre sense front: an extension of ‘Audi pre sense city’, pre sense front operated at speeds up to 250 km/h and could prevent front-to-rear collisions or reduce their severity. In hazardous situations, the driver would receive warnings visual and acoustic warnings to apply the brakes, followed by a brief application of the brakes for a jolting effect to alert the driver. If the driver failed to respond, the S5 Sportback would decelerate to the greatest possible extent if the vehicle ahead of it is still moving;
• Audi pre sense rear: could warn of potential collisions from behind, warn following traffic by rapidly flashing the brake lights and activate the ‘Audi pre sense basic’ protection measures described above;
• Audi pre sense basic: initiated occupant protection measures such as tightening the front seatbelts, closing the windows and sunroof (where fitted), and activating the hazard lights when ‘unstable driving conditions’ were detected;
• Adaptive Cruise Control (ACC): using two front radar sensors and the camera, ACC can maintain a specified distance – from five distances – between the S5 Sportback and the vehicle ahead. Furthermore, ‘Audi drive select’ can be used to adjust the rate of acceleration and other control dynamics;
• Stop&Go function: an extension of the ACC and limited to models with automatic transmissions, ‘Stop&Go’ operated at speeds of 60 km/h to apply the brakes and bring the vehicle to rest. Once traffic began moving, the Audi S5 Sportback would automatically accelerate;
• Traffic jam assistant: as part of the ACC, the Traffic jam assistant provided automated steering if traffic was congested and vehicle speeds were below 65 km/h;
• Audi side assist: operating at speeds above 15 km/h, Audi side assist used two rear radar sensors to monitor traffic up to 70 metres behind the S5 Sportback. If another vehicle approached quickly or was in the driver’s blind spot, a warning LED in the housing of the appropriate door mirror would illuminate. If the driver activated the indicator to change lanes, the LED would blink rapidly to warn the driver;
• Audi active lane assist: used the front camera to detect lane markings at speeds of 65 km/h and above. If the Audi S5 Sportback approached a lane marking without the driver having previously indicated, the electromechanical steering could provide an adjustment to bring the vehicle back into its lane. Using the MMI system, the driver could determine whether this system should be activated at all times or only before the lane marking is crossed. As an option, the driver could choose to have steering wheel vibrations as a warning signal;
• Collision avoidance assist: activated when the S5 Sportback needed to avoid an obstacle to avert a collision. Using data from the front camera, the ACC and radar sensors, ‘avoidance assist’ could calculate the distance of the car ahead, its width and degree of offset. The brakes would be briefly applied to alert the driver of the potential danger and, once the driver started steering, the system would provide ‘support with the necessary lane changes with controlled interventions to the power steering’;
• Rear cross-traffic assist: when reversing at low speeds, rear cross-traffic assist used the rear radar sensors to detect approaching traffic. If approaching traffic was detected which may cross the vehicle’s path, the driver received warnings (visual, acoustic and a brief, jolting application of the brakes);
• Turning assist: active at speeds from 2 km/h to 10 km/h, ‘turning assist’ operated once the driver activates the right-hand turn signal (for RHD vehicles) and could monitor oncoming traffic. In hazardous situations, the brakes could be applied to bring the vehicle to rest;
• Exit warning: activated when the vehicle stopped moving, exit warning warned occupants if vehicles were approaching from behind by illuminating red fibre optics in the door-opening mechanism as the doors were opened;
• Multi-collision brake: after a collision, multi-collision brake provided ‘controlled application of the brakes’ to reduce vehicle speed and reduce both the likelihood and severity of subsequent collisions;
• High beam assist: automatically switched between low and high beam headlights for improved visibility, using a sensor to determine when it was safe to do so (i.e. without dazzling other drivers); and,
• Attention assist: monitored driver behaviour and issued a warning if the driver was assessed to be ‘inattentive’.

The Audi F5 S5 Sportback also had an ‘active bonnet’ which deployed pyrotechnic charges in the event of a pedestrian collision to raise the height of the bonnet and locks to secure it to provide clearance over ‘hard points’ in the engine bay. In doing so, the likely severity of the pedestrian’s impact was reduced.

Features: Audi F5 S5 Sportback

The standard infotainment system for the Audi F5 S5 Sportback included a 180 watt ‘Audi sound system’ with 10 speakers (including subwoofer) and a six-channel amplifier, a digital radio tuner (DAB+), CD/DVD player, 2 SDXC card readers, 10 GB flash memory for media storage, Bluetooth mobile phone connectivity and audio streaming, smartphone integration for Apple or Android devices via USB, ‘Audi connect’ with Wi-Fi hotspot and Google services (required a data plan), and an ‘Audi music interface’ with two USB inputs and a 3.5 mm auxiliary socket. The S5 Sportback was also equipped with Audi’s ‘MMI navigation plus’ which consisted of a seven-inch high-resolution display with 3D maps, live traffic updates, integrated voice control and MMI touch control panel with handwriting recognition.

Beyond this, standard features for the Audi S5 Sportback included 8.5J x 19-inch alloy wheels with 255/35 tyres, three-zone climate control air conditioning, Fine Nappa leather upholstery, power adjustable and heated front ‘S sport’ seats with pneumatic bolster adjustment, driver’s seat massage and memory functions, cruise control, LED headlights, LED daytime running lights, dusk-sensing headlights, rain-sensing wipers, ‘Audi parking system plus’ (i.e. front and rear parking sensors and a rear view camera), a leather-wrapped steering wheel with gearshift paddles, 40:20:40 split and folding rear seats, remote central locking with proximity key, power adjustable and heated door mirrors with folding function and kerb view on reverse for the passenger’s side, a height and reach adjustable steering column, auto-dimming door and interior rear view mirrors, push-button start, interior ambient lighting, floor mats, ‘Carbon atlas’ interior inlays, rear privacy glass, tyre pressure monitoring, a trip computer, an alarm and an immobiliser. As standard, the Audi F5 S5 Sportback was also fitted with:

• A power-operated tailgate which could be opened or closed with a kicking motion beneath the rear bumper;
• ‘Audi parking system plus’ which included front and rear parking sensors and a rear view camera;
• A surround camera system which used four wide-angle cameras to generate a 360 degree view of the vehicle;
• Audi’s ‘virtual cockpit’, a configurable 12.3-inch high-resolution colour display in place of conventional instrument cluster dials.

Audi F5 S5 Sportback: Technik package

As an extra-cost option, the Audi F5 S5 Sportback could be specified with a ‘Technik package’ which included:

• A 755 watt Bang & Olufsen Sound System with 3D sound, including a 16-channel amplifier and 19 loudspeakers;
• Matrix LED headlights which contain twelve LEDs with three reflectors. Using data from the front camera, the control unit switches the LEDs on or off as required, providing 64 different levels of lighting. Using information from the optional MMI Navigation plus system, the direction of the matrix LED headlights could also change before the steering wheel turned; and,
• A head-up display.

Specifications

• Specifications: Audi F5 S5 Sportback (March 2017)
• Technical data: Audi F5 S5 Sportback (September 2016)