Comparison BMW Z4 (E89, facelift 2013) 18i (156 Hp) sDrive & Opel Astra J Sedan 1.6 Turbp (180 Hp)
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| Brand: | BMW | Opel |
| Model: | Z4 | Astra |
| Generation: | Z4 (E89, facelift 2013) | Astra J Sedan |
| Engine / modification: | 18i (156 Hp) sDrive | 1.6 Turbp (180 Hp) |
| Production start: | 2013 year | 2012 year |
| Production end: | 2016 year | 2012 year |
| Coupe type: | Cabriolet | Sedan |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 8.9 l/100 km | 8.8-9 l/100 km |
| Fuel consumption / economy - extra urban: | 5.6 l/100 km | 5.6-5.5 l/100 km |
| Fuel consumption / economy - combined: | 6.8 l/100 km | 6.8 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.34 | |
| Fuel tank volume: | 55 l | 56 l |
| Emission standard: | Euro 6 | Euro 5 |
| CO2 emissions: | 159 g/km | 159 g/km |
| Power: | 156 hp | 180 hp |
| Max power in: | 5000 rpm. | 5500 rpm. |
| Maximum speed: | 221 km/h | 223 km/h |
| Acceleration from 0 to 100 km/h: | 7.9 sec | 8.7 sec |
| Torque: | 240 Nm @ 1250-4400 rpm. | 230 Nm @ 2200-5500 rpm. |
| Model Engine: | N20B20 | A16LET |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 1997 cm3 | 1598 cm3 |
| Engine oil capacity: | 4.75 l | |
| Coolant: | 8.2 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | Turbocharging |
| Position of cylinders: | Inline | Inline |
| Number of cylinders: | 4 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | |
| Piston Stroke: | 90.1 mm | 81.5 mm |
| Cylinder Bore: | 84 mm | 79 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (manual transmission): | 6 | 6 |
| Length: | 4239 mm | 4658 mm |
| Width: | 1790 mm | 1814 mm |
| Width including mirrors: | 2013 mm | |
| Height: | 1291 mm | 1500 mm |
| Wheelbase: | 2496 mm | 2685 mm |
| Front track: | 1511 mm | 1541 mm |
| Rear (Back) track: | 1562 mm | 1551 mm |
| Ride height(clearance): | 130 mm | |
| Front overhang: | 974 mm | |
| Rear overhang: | 999 mm | |
| Minimum volume of Luggage (trunk): | 180 l | 460 l |
| Maximum amount of Luggage (trunk): | 310 l | 1010 l |
| Front suspension: | Double wishbone | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 1725 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1395 kg | |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 10.7 m | 11.5 m |
| Tire size: | 225/45 R17 | |
| Wheel rims size: | 8J x 17 |