Comparison BMW 6 Series Convertible (F12 LCI, facelift 2015) 640i (320 Hp) xDrive Steptronic & Audi S4 Avant (4A,C4) 2.2i 20V Turbo (230 Hp) quattro & Audi A6 (4F,C6 facelift 2008) 2.7 TDI V6 (190 Hp) DPF
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| Brand: | BMW | Audi | Audi |
| Model: | 6 Series | S4 | A6 |
| Generation: | 6 Series Convertible (F12 LCI, facelift 2015) | S4 Avant (4A,C4) | A6 (4F,C6 facelift 2008) |
| Engine / modification: | 640i (320 Hp) xDrive Steptronic | 2.2i 20V Turbo (230 Hp) quattro | 2.7 TDI V6 (190 Hp) DPF |
| Production start: | 2015 year | 1991 year | 2008 year |
| Production end: | 2018 year | 1994 year | 2011 year |
| Coupe type: | Cabriolet | Combi | Sedan |
| Num. of Doors: | 2 | 5 | 4 |
| Num. of seats: | 4 | 5 | 5 |
| Fuel consumption / economy - urban: | 11.2-11.7 l/100 km | 8.3 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.2-6.4 l/100 km | 5.0 l/100 km | |
| Fuel consumption / economy - combined: | 8.0-8.4 l/100 km | 6.2 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.31 | 0.34 | 0.29 |
| Fuel tank volume: | 70 l | 80 l | 70 l |
| Emission standard: | Euro 6 | Euro 4 | |
| CO2 emissions: | 187-195 g/km | 164 g/km | |
| Power: | 320 hp | 230 hp | 190 hp |
| Max power in: | 5800-6000 rpm. | 5900 rpm. | 3500 rpm. |
| Maximum speed: | 250 km/h | 235 km/h | 232 km/h |
| Acceleration from 0 to 100 km/h: | 5.4 sec | 7.1 sec | 7.9 sec |
| Torque: | 450 Nm @ 1300-4500 rpm. | 350 Nm/1950 rpm. | 400 Nm @ 1400 rpm. |
| Model Engine: | N55B30 | CANA, CANC | |
| Engine position: | Front, longitudinal | Front, transverse | Front, longitudinal |
| Engine displacement: | 2979 cm3 | 2226 cm3 | 2698 cm3 |
| Engine oil capacity: | 6.5 l | 8.2 l | |
| Coolant: | 10.2 l | ||
| Fuel System: | Direct injection | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Twin-power turbo | Turbocharging | Turbo / Intercooler (Turbocharging / Intercooler) |
| Position of cylinders: | Inline | Inline | V engine |
| Valvetrain: | DOHC | ||
| Number of cylinders: | 6 | 5 | 6 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 10.2 | 9.3 | |
| Piston Stroke: | 89.6 mm | 86.4 mm | |
| Cylinder Bore: | 84 mm | 81 mm | |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive | |
| Number of Gears (automatic transmission): | 8 Steptronic | ||
| Number of Gears (manual transmission): | 6 | 6 | |
| Length: | 4894 mm | 4790 mm | 4927 mm |
| Width: | 1894 mm | 1804 mm | 1855 mm |
| Width including mirrors: | 2030 mm | ||
| Height: | 1365 mm | 1454 mm | 1459 mm |
| Wheelbase: | 2855 mm | 2692 mm | 2843 mm |
| Front track: | 1600 mm | 1562 mm | 1612 mm |
| Rear (Back) track: | 1665 mm | 1531 mm | 1618 mm |
| Ride height(clearance): | 123 mm | 117 mm | |
| Front overhang: | 994 mm | ||
| Rear overhang: | 1090 mm | ||
| Minimum volume of Luggage (trunk): | 300 l | 390 l | 546 l |
| Maximum amount of Luggage (trunk): | 350 l | 1310 l | 546 l |
| Front suspension: | Double wishbone | Independent multi-link | |
| Rear suspension: | Multi-link independent | Independent on trapezoidal lever | |
| Max weight: | 2390 kg | 2210 kg | 2215 kg |
| Front brakes: | Disc | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1890 kg | 1660 kg | 1635 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering | |
| Max. roof load: | 100 kg | ||
| Permitted trailer load with brakes (8%): | 1800 kg | ||
| Minimum turning circle (turning diameter): | 11.7 m | 11.4 m | 11.9 m |
| Permitted trailer load with brakes (12%): | 1600 kg | ||
| Permitted trailer load without brakes: | 750 kg | ||
| Permitted towbar download: | 85 kg | ||
| Tire size: | 225/55 R17; 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 | 215/60 R15 | 205/60 R16 |
| Wheel rims size: | 8J x 17; 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 | R15 | 7J x 16 |