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
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| Brand: | BMW | Audi |
| Model: | 6 Series | S4 |
| Generation: | 6 Series Convertible (F12 LCI, facelift 2015) | S4 Avant (4A,C4) |
| Engine / modification: | 640i (320 Hp) xDrive Steptronic | 2.2i 20V Turbo (230 Hp) quattro |
| Production start: | 2015 year | 1991 year |
| Production end: | 2018 year | 1994 year |
| Coupe type: | Cabriolet | Combi |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 11.2-11.7 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.2-6.4 l/100 km | |
| Fuel consumption / economy - combined: | 8.0-8.4 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | 0.34 |
| Fuel tank volume: | 70 l | 80 l |
| Emission standard: | Euro 6 | |
| CO2 emissions: | 187-195 g/km | |
| Power: | 320 hp | 230 hp |
| Max power in: | 5800-6000 rpm. | 5900 rpm. |
| Maximum speed: | 250 km/h | 235 km/h |
| Acceleration from 0 to 100 km/h: | 5.4 sec | 7.1 sec |
| Torque: | 450 Nm @ 1300-4500 rpm. | 350 Nm/1950 rpm. |
| Model Engine: | N55B30 | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 2979 cm3 | 2226 cm3 |
| Engine oil capacity: | 6.5 l | |
| Coolant: | 10.2 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | Turbocharging |
| Position of cylinders: | Inline | Inline |
| Number of cylinders: | 6 | 5 |
| Number of valves per cylinder: | 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) | |
| Number of Gears (automatic transmission): | 8 Steptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4894 mm | 4790 mm |
| Width: | 1894 mm | 1804 mm |
| Height: | 1365 mm | 1454 mm |
| Wheelbase: | 2855 mm | 2692 mm |
| Front track: | 1600 mm | 1562 mm |
| Rear (Back) track: | 1665 mm | 1531 mm |
| Ride height(clearance): | 123 mm | |
| Minimum volume of Luggage (trunk): | 300 l | 390 l |
| Maximum amount of Luggage (trunk): | 350 l | 1310 l |
| Front suspension: | Double wishbone | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 2390 kg | 2210 kg |
| Front brakes: | Disc | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1890 kg | 1660 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 11.7 m | 11.4 m |
| 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 |
| 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 |