Comparison Opel Signum (facelift 2005) 1.9 CDTI (100 Hp) & BMW 3 Series Convertible (E46, facelift 2001) 323i (170 Hp) & BMW 3 Series Sedan (E90) 330 Xd (231 Hp)
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| Brand: | Opel | BMW | BMW |
| Model: | Signum | 3 Series | 3 Series |
| Generation: | Signum (facelift 2005) | 3 Series Convertible (E46, facelift 2001) | 3 Series Sedan (E90) |
| Engine / modification: | 1.9 CDTI (100 Hp) | 323i (170 Hp) | 330 Xd (231 Hp) |
| Production start: | 2005 year | 2000 year | 2005 year |
| Production end: | 2008 year | 2005 year | 2007 year |
| Coupe type: | Hatchback | Cabriolet | Sedan |
| Num. of Doors: | 5 | 2 | 4 |
| Num. of seats: | 5 | 4 | 5 |
| Fuel consumption / economy - urban: | 7.6 l/100 km | 13.4 l/100 km | 9.6 l/100 km |
| Fuel consumption / economy - extra urban: | 4.9 l/100 km | 7.5 l/100 km | 5.8 l/100 km |
| Fuel consumption / economy - combined: | 5.9 l/100 km | 9.7 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.32 | ||
| Fuel tank volume: | 60 l | 63 l | 61 l |
| CO2 emissions: | 159 g/km | ||
| Power: | 100 hp | 170 hp | 231 hp |
| Max power in: | 3500 rpm. | 5500 rpm. | 4000 rpm. |
| Maximum speed: | 180 km/h | 225 km/h | 242 km/h |
| Acceleration from 0 to 100 km/h: | 14 sec | 8.6 sec | 6.6 sec |
| Torque: | 260 Nm @ 1700 rpm. | 245 Nm @ 3950 rpm. | 500 Nm @ 1750 rpm. |
| Model Engine: | Z19DTL | M57D30TU2 | |
| Engine position: | Front, transverse | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1910 cm3 | 2494 cm3 | 2993 cm3 |
| Engine oil capacity: | 4.3 l | 7.5 l | |
| Fuel System: | Diesel Commonrail | Multi-point injection | Multi-point injection |
| Aspiration / Turbine: | Turbocharging | Turbocharger | |
| Position of cylinders: | Inline | Inline | Inline |
| Valvetrain: | DOHC | DOHC | - |
| Number of cylinders: | 4 | 6 | 6 |
| Number of valves per cylinder: | 2 | 4 | 4 |
| Compression ratio: | 17.5 | 10.5 | 17 |
| Piston Stroke: | 90.4 mm | 75 mm | 90 mm |
| Cylinder Bore: | 82 mm | 84 mm | 84 mm |
| Wheel Drive: | Front wheel drive | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | ||
| Number of Gears (manual transmission): | 6 | 5 | 6 |
| Length: | 4651 mm | 4488 mm | 4520 mm |
| Width: | 1798 mm | 1757 mm | 1817 mm |
| Height: | 1460 mm | 1372 mm | 1421 mm |
| Wheelbase: | 2830 mm | 2725 mm | 2760 mm |
| Front track: | 1524 mm | 1471 mm | 1500 mm |
| Rear (Back) track: | 1525 mm | 1483 mm | 1513 mm |
| Minimum volume of Luggage (trunk): | 365 l | 300 l | 460 l |
| Maximum amount of Luggage (trunk): | 1410 l | ||
| Front suspension: | Coil spring | Wishbone | The depreciated rack |
| Rear suspension: | Helical spring | Helical spring | Helical spring |
| Max weight: | 2130 kg | 1940 kg | 2155 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1545 kg | 1595 kg | 1640 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | |
| Tire size: | 215/55 R16 | 205/55 R16 | 225/45 R17 |
| Wheel rims size: | 6.5J x 16 | 7J x 16 | 8J x 17 |