Comparison BMW 8 Series (E31) 850 Ci 5.4 (326 Hp) & Audi S6 Avant (4A,C4) 2.2i 20V Turbo (230 Hp) quattro Automatic & Audi A7 Sportback (C7 facelift 2014) Competition 3.0 BiTDI V6 (326 Hp) quattro Tiptronic
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| Brand: | BMW | Audi | Audi |
| Model: | 8 Series | S6 | A7 |
| Generation: | 8 Series (E31) | S6 Avant (4A,C4) | A7 Sportback (C7 facelift 2014) |
| Engine / modification: | 850 Ci 5.4 (326 Hp) | 2.2i 20V Turbo (230 Hp) quattro Automatic | Competition 3.0 BiTDI V6 (326 Hp) quattro Tiptronic |
| Production start: | 1994 year | 1994 year | 2014 year |
| Production end: | 1999 year | 1997 year | 2018 year |
| Coupe type: | Coupe | Combi | Hatchback |
| Num. of Doors: | 2 | 5 | 5 |
| Num. of seats: | 4 | 5 | 5 |
| Fuel consumption / economy - urban: | 21.1 l/100 km | 16.1 l/100 km | 7.4 l/100 km |
| Fuel consumption / economy - extra urban: | 9.9 l/100 km | 8.4 l/100 km | 5.4 l/100 km |
| Fuel consumption / economy - combined: | 10.8 l/100 km | 6.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.35 | 0.29 | |
| Fuel tank volume: | 90 l | 80 l | 73 l |
| Emission standard: | EURO V | Euro 6 | |
| CO2 emissions: | 105 g/km | 162 g/km | |
| Power: | 326 hp | 230 hp | 326 hp |
| Max power in: | 5000 rpm. | 5900 rpm. | 4000-4500 rpm. |
| Maximum speed: | 250 km/h | 231 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.3 sec | 8.4 sec | 5.1 sec |
| Torque: | 490 Nm @ 3900 rpm. | 350 Nm @ 1950 rpm. | 650 Nm @ 1400-2800 rpm. |
| Model Engine: | M73B54 | CVUB | |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 5379 cm3 | 2226 cm3 | 2967 cm3 |
| Engine oil capacity: | 8.0 l | 4.5 l | 8 / 8.2 l |
| Coolant: | 13.0 l | 9.0 l | |
| Fuel System: | Multi-point injection | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Turbocharging | BiTurbo | |
| Position of cylinders: | V engine | Inline | V engine |
| Valvetrain: | OHC | DOHC | |
| Number of cylinders: | 12 | 5 | 6 |
| Number of valves per cylinder: | 2 | 4 | 4 |
| Compression ratio: | 10 | 9.3 | 15.5 |
| Piston Stroke: | 79 mm | 86.4 mm | 91.4 mm |
| Cylinder Bore: | 85 mm | 81 mm | 83 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 5 | 4 | 8 Tiptronic |
| Number of Gears (manual transmission): | 6 | ||
| Length: | 4780 mm | 4797 mm | 4974 mm |
| Width: | 1855 mm | 1804 mm | 1911 mm |
| Width with mirrors folded: | 1831 mm | ||
| Width including mirrors: | 2013 mm | 2139 mm | |
| Height: | 1340 mm | 1440 mm | 1420 mm |
| Wheelbase: | 2684 mm | 2692 mm | 2914 mm |
| Front track: | 1554 mm | 1556 mm | 1644 mm |
| Rear (Back) track: | 1562 mm | 1525 mm | 1635 mm |
| Ride height(clearance): | 165 mm | ||
| Front overhang: | 937 mm | ||
| Rear overhang: | 1123 mm | ||
| Minimum volume of Luggage (trunk): | 320 l | 390 l | 535 l |
| Maximum amount of Luggage (trunk): | 1310 l | 1390 l | |
| Front suspension: | Wishbone | Independent, Spring McPherson, with stabilizer | Multi-link suspension |
| Rear suspension: | Helical spring | Independent on trapezoidal lever | Independent on trapezoidal lever |
| Max weight: | 2300 kg | 2285 kg | 2535 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1880 kg | 1735 kg | 1925 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | Electric Steering |
| Max. roof load: | 100 kg | 100 kg | |
| Permitted trailer load with brakes (8%): | 2100 kg | 2100 kg | |
| Minimum turning circle (turning diameter): | 11.4 m | 11.9 m | |
| Permitted trailer load with brakes (12%): | 1650 kg | ||
| Permitted trailer load without brakes: | 750 kg | 750 kg | |
| Permitted towbar download: | 75 kg | 85 kg | |
| Tire size: | 235/50 R16 | 225/50 R16 | 235/55 R17 |
| Wheel rims size: | R16 | 7.5J x 16 | 8.0J x 17 |