Comparison Buick Riviera 3.8 i V6 Supercharged (243 Hp) & BMW 8 Series Convertible (G14) 840d (320 Hp) xDrive Steptronic
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| Brand: | Buick | BMW |
| Model: | Riviera | 8 Series |
| Generation: | Riviera | 8 Series Convertible (G14) |
| Engine / modification: | 3.8 i V6 Supercharged (243 Hp) | 840d (320 Hp) xDrive Steptronic |
| Production start: | 1998 year | 2019 year |
| Production end: | 2000 year | 2020 year |
| Coupe type: | Coupe | Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 5 | 4 |
| Fuel consumption / economy - urban: | 13.1 l/100 km | 7.3-7.4 l/100 km |
| Fuel consumption / economy - extra urban: | 8.7 l/100 km | 5.1-5.6 l/100 km |
| Fuel consumption / economy - combined: | 5.9-6.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.30 | |
| Fuel tank volume: | 70 l | 66 l |
| Emission standard: | Euro 6d | |
| CO2 emissions: | 155-166 g/km | |
| Power: | 243 hp | 320 hp |
| Max power in: | 5200 rpm. | 4400 rpm. |
| Maximum speed: | 175 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 7.2 sec | 5.2 sec |
| Torque: | 380 Nm/3600 rpm. | 680 Nm @ 1750-2250 rpm. |
| Model Engine: | B57D30 | |
| Engine position: | Front, transverse | Front, longitudinal |
| Engine displacement: | 3791 cm3 | 2993 cm3 |
| Engine oil capacity: | 6.5 l | |
| Coolant: | 9.5 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | Twin-power turbo |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | - | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 8.5 | 16.5 |
| Piston Stroke: | 86.4 mm | 90 mm |
| Cylinder Bore: | 96.5 mm | 84 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 4 | 8 Steptronic |
| Length: | 5260 mm | 4843 mm |
| Width: | 1910 mm | 1902 mm |
| Width including mirrors: | 2137 mm | |
| Height: | 1390 mm | 1339 mm |
| Wheelbase: | 2890 mm | 2822 mm |
| Front track: | 1590 mm | 1619 mm |
| Rear (Back) track: | 1580 mm | 1642 mm |
| Ride height(clearance): | 118 mm | |
| Minimum volume of Luggage (trunk): | 495 l | 350 l |
| Front suspension: | The depreciated rack | Double wishbone |
| Rear suspension: | Helical spring | Multi-link independent |
| Max weight: | 2485 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Drum | Ventilated discs |
| Kerb Weight: | 1675 kg | 1955 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 11.9 m | |
| Tire size: | 225/60 R16 | 245/45 R18 100Y; 275/40 R18 103Y |
| Wheel rims size: | 8J x 18; 9J x 18 |