Comparison Mercedes-Benz W121 Sedan 190 (75 Hp) & BMW 3 Series Sedan (E90, facelift 2008) 323i (200 Hp) Steptronic
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| Brand: | Mercedes-Benz | BMW |
| Model: | Ponton | 3 Series |
| Generation: | W121 Sedan | 3 Series Sedan (E90, facelift 2008) |
| Engine / modification: | 190 (75 Hp) | 323i (200 Hp) Steptronic |
| Production start: | 1956 year | 2008 year |
| Production end: | 1959 year | 2011 year |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 11.2 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.7 l/100 km | |
| Fuel consumption / economy - combined: | 8.9 l/100 km | 9.2 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.28 | |
| Fuel tank volume: | 56 l | 61 l |
| Power: | 75 hp | 200 hp |
| Max power in: | 4600 rpm. | 6000 rpm. |
| Maximum speed: | 140 km/h | 210 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 20.5 sec | 8.1 sec |
| Torque: | 136 Nm @ 2800 rpm. | 244 Nm @ 4000-5000 rpm. |
| Model Engine: | M 121 B I / 121.920 | N52B25 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1897 cm3 | 2497 cm3 |
| Engine oil capacity: | 4 l | 6.5 l |
| Fuel System: | Carburettor | |
| Position of cylinders: | Inline | Inline |
| Valvetrain: | SOHC | DOHC, Valvetronic |
| Number of cylinders: | 4 | 6 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 7.5 | 11 |
| Piston Stroke: | 83.6 mm | 78.8 mm |
| Cylinder Bore: | 85 mm | 82 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 6 Steptronic | |
| Number of Gears (manual transmission): | 4 | |
| Length: | 4485 mm | 4541 mm |
| Width: | 1740 mm | 1817 mm |
| Width including mirrors: | 1989 mm | |
| Height: | 1560 mm | 1421 mm |
| Wheelbase: | 2650 mm | 2760 mm |
| Front track: | 1430 mm | 1500 mm |
| Rear (Back) track: | 1470 mm | 1529 mm |
| Minimum volume of Luggage (trunk): | 460 l | |
| Max weight: | 1650 kg | 2011 kg |
| Front brakes: | Drum | |
| Rear brakes: | Drum | |
| Kerb Weight: | 1200 kg | 1530 kg |
| Steering type: | Cone worm with recirculation balls | |
| Power steering: | Electric Steering | |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11 m | |
| Tire size: | 205/55 R16; 225/45 R17 | |
| Wheel rims size: | 7J x 16; 8J x 17 |