Comparison BMW 6 Series Gran Turismo (G32) 640i (340 Hp) Steptronic & BMW 8 Series (E31) 850 Ci 5.4 (326 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 8 Series |
| Generation: | 6 Series Gran Turismo (G32) | 8 Series (E31) |
| Engine / modification: | 640i (340 Hp) Steptronic | 850 Ci 5.4 (326 Hp) |
| Production start: | 2017 year | 1994 year |
| Production end: | 2020 year | 1999 year |
| Coupe type: | Coupe | |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 4 |
| Fuel consumption / economy - urban: | 9.6-9.8 l/100 km | 21.1 l/100 km |
| Fuel consumption / economy - extra urban: | 5.4-6.0 l/100 km | 9.9 l/100 km |
| Fuel consumption / economy - combined: | 7.0-7.4 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.26 | |
| Fuel tank volume: | 68 l | 90 l |
| Emission standard: | Euro 6 | |
| CO2 emissions: | 159-169 g/km | |
| Power: | 340 hp | 326 hp |
| Max power in: | 5500-6500 rpm. | 5000 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5.4 sec | 6.3 sec |
| Torque: | 450 Nm @ 1380-5200 rpm. | 490 Nm @ 3900 rpm. |
| Model Engine: | B58B30 | M73B54 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2998 cm3 | 5379 cm3 |
| Engine oil capacity: | 6.5 l | 8.0 l |
| Coolant: | 13.0 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | OHC | |
| Number of cylinders: | 6 | 12 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 11 | 10 |
| Piston Stroke: | 94.6 mm | 79 mm |
| Cylinder Bore: | 82 mm | 85 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 Steptronic | 5 |
| Length: | 5091 mm | 4780 mm |
| Width: | 1902 mm | 1855 mm |
| Width including mirrors: | 2158 mm | |
| Height: | 1538 mm | 1340 mm |
| Wheelbase: | 3070 mm | 2684 mm |
| Front track: | 1615 mm | 1554 mm |
| Rear (Back) track: | 1649 mm | 1562 mm |
| Ride height(clearance): | 138 mm | |
| Front overhang: | 871 mm | |
| Rear overhang: | 1150 mm | |
| Minimum volume of Luggage (trunk): | 610 l | 320 l |
| Maximum amount of Luggage (trunk): | 1800 l | |
| Front suspension: | Double wishbone | Wishbone |
| Rear suspension: | Multi-link independent | Helical spring |
| Max weight: | 2450 kg | 2300 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1770 kg | 1880 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 12.3 m | |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 100 kg | |
| Tire size: | 225/60 R17; 245/50 R18; 245/45 R19; 275/40 R19; 245/40 R20; 275/35 R20 | 235/50 R16 |
| Wheel rims size: | 7.5J x 17; 8J x 18; 8.5J x 19; 9.5J x 19; 8.5J x 20; 10J x 20 | R16 |