Comparison BMW 1 Series Convertible (E88) 120d (177 Hp) Automatic & BMW 3 Series (E21) 320 (122 Hp)
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| Brand: | BMW | BMW |
| Model: | 1 Series | 3 Series |
| Generation: | 1 Series Convertible (E88) | 3 Series (E21) |
| Engine / modification: | 120d (177 Hp) Automatic | 320 (122 Hp) |
| Production start: | 2008 year | 1977 year |
| Production end: | 2011 year | 1982 year |
| Coupe type: | Cabriolet | Sedan |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 7.4 l/100 km | 13.0 l/100 km |
| Fuel consumption / economy - extra urban: | 4.5 l/100 km | 7.2 l/100 km |
| Fuel consumption / economy - combined: | 5.6 l/100 km | 9.6 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 51 l | 58 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 148 g/km | |
| Power: | 177 hp | 122 hp |
| Max power in: | 4000 rpm. | 6000 rpm. |
| Maximum speed: | 220 km/h | 180 km/h |
| Acceleration from 0 to 100 km/h: | 8.2 sec | 10.0 sec |
| Torque: | 350 Nm @ 1750-3000 rpm. | 160 Nm @ 4000 rpm. |
| Model Engine: | N47D20 | M20 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1995 cm3 | 1990 cm3 |
| Engine oil capacity: | 5.2 l | 4.0 l |
| Coolant: | 7.4 l | |
| Fuel System: | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbocharger | |
| Position of cylinders: | Inline | Inline |
| Valvetrain: | - | |
| Number of cylinders: | 4 | 6 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 16 | |
| Piston Stroke: | 90 mm | 66 mm |
| Cylinder Bore: | 84 mm | 80 mm |
| Wheel Drive: | Rear wheel drive | |
| Number of Gears (automatic transmission): | 6 | |
| Number of Gears (manual transmission): | 5 | |
| Length: | 4360 mm | 4355 mm |
| Width: | 1748 mm | 1610 mm |
| Height: | 1411 mm | 1380 mm |
| Wheelbase: | 2660 mm | 2563 mm |
| Front track: | 1480 mm | 1366 mm |
| Rear (Back) track: | 1513 mm | 1373 mm |
| Ride height(clearance): | 140 mm | 145 mm |
| Minimum volume of Luggage (trunk): | 260 l | 404 l |
| Maximum amount of Luggage (trunk): | 305 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 1960 kg | |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1520 kg | 1090 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Minimum turning circle (turning diameter): | 10.7 m | |
| Permitted trailer load with brakes (12%): | 1200 kg | |
| Permitted trailer load without brakes: | 720 kg | |
| Tire size: | 205/55 R16 91 V | |
| Wheel rims size: | 7J x 16 |