Comparison BMW Z4 (E89, facelift 2013) 28i (245 Hp) sDrive & Opel Signum (facelift 2005) 3.0 V6 CDTI (184 Hp) & Mazda CX-5 II 2.5 SKYACTIV-G (250 Hp) AWD Automatic
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| Brand: | BMW | Opel | Mazda |
| Model: | Z4 | Signum | CX-5 |
| Generation: | Z4 (E89, facelift 2013) | Signum (facelift 2005) | CX-5 II |
| Engine / modification: | 28i (245 Hp) sDrive | 3.0 V6 CDTI (184 Hp) | 2.5 SKYACTIV-G (250 Hp) AWD Automatic |
| Production start: | 2013 year | 2005 year | 2019 year |
| Production end: | 2016 year | 2008 year | |
| Coupe type: | Cabriolet | Hatchback | SUV |
| Num. of Doors: | 2 | 5 | 5 |
| Num. of seats: | 2 | 5 | 5 |
| Fuel consumption / economy - urban: | 9.1 l/100 km | 9.9 l/100 km | 10.7 l/100 km |
| Fuel consumption / economy - extra urban: | 5.5 l/100 km | 5.3 l/100 km | 8.7 l/100 km |
| Fuel consumption / economy - combined: | 6.8 l/100 km | 7 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.34 | 0.32 | |
| Fuel tank volume: | 55 l | 60 l | 58 l |
| Emission standard: | Euro 6 | ||
| CO2 emissions: | 159 g/km | ||
| Power: | 245 hp | 184 hp | 250 hp |
| Max power in: | 5000-6500 rpm. | 4000 rpm. | 5000 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. | 420 Nm @ 2000 rpm. |
| Model Engine: | N20B20 | Z30DT | |
| Engine position: | Front, longitudinal | Front, transverse | Front, transverse |
| Engine displacement: | 1997 cm3 | 2958 cm3 | 2488 cm3 |
| Engine oil capacity: | 4.75 l | 7.5 l | |
| Coolant: | 8.2 l | ||
| Fuel System: | Direct injection | Diesel Commonrail | Direct injection |
| Maximum engine speed: | 6300 rpm. | ||
| Aspiration / Turbine: | Twin-power turbo | Turbocharging | Turbocharger |
| Position of cylinders: | Inline | V engine | Inline |
| Valvetrain: | DOHC | DOHC-VVT | |
| Number of cylinders: | 4 | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 10 | 18.5 | 10.5 |
| Piston Stroke: | 90.1 mm | 82 mm | 100 mm |
| Cylinder Bore: | 84 mm | 87.5 mm | 89 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | ||
| Number of Gears (manual transmission): | 6 | 6 | |
| Length: | 4239 mm | 4651 mm | 4549 mm |
| Width: | 1790 mm | 1798 mm | 1841 mm |
| Width including mirrors: | 2116 mm | ||
| Height: | 1291 mm | 1460 mm | 1679 mm |
| Wheelbase: | 2496 mm | 2830 mm | 2697 mm |
| Front track: | 1511 mm | 1535 mm | 1595 mm |
| Rear (Back) track: | 1559 mm | 1525 mm | 1595 mm |
| Ride height(clearance): | 130 mm | 190 mm | |
| Minimum volume of Luggage (trunk): | 180 l | 365 l | 875 l |
| Maximum amount of Luggage (trunk): | 310 l | 1410 l | 1688 l |
| Front suspension: | Double wishbone | Coil spring | Independent, Spring McPherson, with stabilizer |
| Rear suspension: | Multi-link independent | Helical spring | Independent, spring multi-link with stabilizer |
| Max weight: | 1730 kg | 2185 kg | |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc | Disc |
| Kerb Weight: | 1400 kg | 1670 kg | 1735 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 10.7 m | 11.0 m | |
| Permitted trailer load with brakes (12%): | 907 kg | ||
| Tire size: | 225/45 R17 | 215/55 R16 | 225/55 R19 |
| Wheel rims size: | 8J x 17 | 6.5J x 16 | 7J x 19 |