Comparison BMW 8 Series (E31) 850i (300 Hp) & Renault 21 (B48) 2.1 D (74 Hp)
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| Brand: | BMW | Renault |
| Model: | 8 Series | 21 |
| Generation: | 8 Series (E31) | 21 (B48) |
| Engine / modification: | 850i (300 Hp) | 2.1 D (74 Hp) |
| Production start: | 1989 year | 1989 year |
| Production end: | 1992 year | 1993 year |
| Coupe type: | Coupe | Sedan |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 19.8 l/100 km | 7.4 l/100 km |
| Fuel consumption / economy - extra urban: | 8.8 l/100 km | 4.5 l/100 km |
| Fuel consumption / economy - combined: | 10.4 l/100 km | 5.9 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.29 | |
| Fuel tank volume: | 90 l | 66 l |
| Power: | 300 hp | 74 hp |
| Max power in: | 5200 rpm. | 4500 rpm. |
| Maximum speed: | 250 km/h | 170 km/h |
| Acceleration from 0 to 100 km/h: | 6.8 sec | 15.1 sec |
| Torque: | 450 Nm @ 4100 rpm. | 139 Nm @ 2250 rpm. |
| Model Engine: | M70B50 | J8S |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 4988 cm3 | 2068 cm3 |
| Engine oil capacity: | 7.5 l | 6.1 l |
| Coolant: | 13 l | 7.1 l |
| Fuel System: | Multi-point injection | Diesel - Standard diesel injection (SDI) |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | OHC | |
| Number of cylinders: | 12 | 4 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 8.8 | 21.5 |
| Piston Stroke: | 75 mm | 89 mm |
| Cylinder Bore: | 84 mm | 86 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | - | |
| Number of Gears (manual transmission): | 6 | 5 |
| Length: | 4780 mm | 4530 mm |
| Width: | 1855 mm | 1730 mm |
| Height: | 1340 mm | 1415 mm |
| Wheelbase: | 2684 mm | 2660 mm |
| Front track: | 1554 mm | 1430 mm |
| Rear (Back) track: | 1562 mm | 1400 mm |
| Ride height(clearance): | 140 mm | |
| Minimum volume of Luggage (trunk): | 360 l | 490 l |
| Front suspension: | The depreciated rack | |
| Rear suspension: | Torsion | |
| Max weight: | 2190 kg | 1570 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Drum |
| Kerb Weight: | 1790 kg | 1100 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 11.5 m | |
| Tire size: | 235/50 ZR 16 | 175/70 R13 |
| Wheel rims size: | R16 | R13 |