Comparison BMW Z4 (E89, facelift 2013) 28i (245 Hp) sDrive & Opel Signum (facelift 2005) 3.0 V6 CDTI (184 Hp)
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| Brand: | BMW | Opel |
| Model: | Z4 | Signum |
| Generation: | Z4 (E89, facelift 2013) | Signum (facelift 2005) |
| Engine / modification: | 28i (245 Hp) sDrive | 3.0 V6 CDTI (184 Hp) |
| Production start: | 2013 year | 2005 year |
| Production end: | 2016 year | 2008 year |
| Coupe type: | Cabriolet | Hatchback |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 9.1 l/100 km | 9.9 l/100 km |
| Fuel consumption / economy - extra urban: | 5.5 l/100 km | 5.3 l/100 km |
| Fuel consumption / economy - combined: | 6.8 l/100 km | 7 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.34 | 0.32 |
| Fuel tank volume: | 55 l | 60 l |
| Emission standard: | Euro 6 | |
| CO2 emissions: | 159 g/km | |
| Power: | 245 hp | 184 hp |
| Max power in: | 5000-6500 rpm. | 4000 rpm. |
| Maximum speed: | 250 km/h | 224 km/h |
| Acceleration from 0 to 100 km/h: | 5.7 sec | 9.2 sec |
| Torque: | 350 Nm @ 1250-4800 rpm. | 370 Nm @ 1900 rpm. |
| Model Engine: | N20B20 | Z30DT |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 1997 cm3 | 2958 cm3 |
| Engine oil capacity: | 4.75 l | 7.5 l |
| Coolant: | 8.2 l | |
| Fuel System: | Direct injection | Diesel Commonrail |
| Aspiration / Turbine: | Twin-power turbo | Turbocharging |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 4 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 18.5 |
| Piston Stroke: | 90.1 mm | 82 mm |
| Cylinder Bore: | 84 mm | 87.5 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (manual transmission): | 6 | 6 |
| Length: | 4239 mm | 4651 mm |
| Width: | 1790 mm | 1798 mm |
| Height: | 1291 mm | 1460 mm |
| Wheelbase: | 2496 mm | 2830 mm |
| Front track: | 1511 mm | 1535 mm |
| Rear (Back) track: | 1559 mm | 1525 mm |
| Ride height(clearance): | 130 mm | |
| Minimum volume of Luggage (trunk): | 180 l | 365 l |
| Maximum amount of Luggage (trunk): | 310 l | 1410 l |
| Front suspension: | Double wishbone | Coil spring |
| Rear suspension: | Multi-link independent | Helical spring |
| Max weight: | 1730 kg | 2185 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1400 kg | 1670 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 10.7 m | |
| Tire size: | 225/45 R17 | 215/55 R16 |
| Wheel rims size: | 8J x 17 | 6.5J x 16 |