Comparison BMW Z4 (E89) 20i (184 Hp) sDrive & Opel Astra J GTC 1.4 (120 Hp) Turbo Ecotec start/stop & Opel Astra G Cabrio 2.2 Ecotec 16V (147 Hp) Automatic
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| Brand: | BMW | Opel | Opel |
| Model: | Z4 | Astra | Astra |
| Generation: | Z4 (E89) | Astra J GTC | Astra G Cabrio |
| Engine / modification: | 20i (184 Hp) sDrive | 1.4 (120 Hp) Turbo Ecotec start/stop | 2.2 Ecotec 16V (147 Hp) Automatic |
| Production start: | 2011 year | 2011 year | 2001 year |
| Production end: | 2013 year | 2018 year | 2005 year |
| Coupe type: | Cabriolet | Hatchback | Cabriolet |
| Num. of Doors: | 2 | 3 | 2 |
| Num. of seats: | 2 | 5 | 4 |
| Fuel consumption / economy - urban: | 8.9 l/100 km | 7.7-7.8 l/100 km | 12 l/100 km |
| Fuel consumption / economy - extra urban: | 5.6 l/100 km | 4.9-5.0 l/100 km | 6.8 l/100 km |
| Fuel consumption / economy - combined: | 6.8 l/100 km | 5.9-6.0 l/100 km | 8.7 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | 0.30 | |
| Fuel tank volume: | 55 l | 56 l | 52 l |
| Emission standard: | Euro 5 | Euro 4 | |
| CO2 emissions: | 159 g/km | 139-142 g/km | 209 g/km |
| Power: | 184 hp | 120 hp | 147 hp |
| Max power in: | 5000 rpm. | 4200-6000 rpm. | 5800 rpm. |
| Maximum speed: | 235 km/h | 192 km/h | 210 km/h |
| Acceleration from 0 to 100 km/h: | 6.9 sec | 11 sec | 11 sec |
| Torque: | 270 Nm @ 1250-4500 rpm. | 200 Nm @ 1850-4200 rpm. | 203 Nm @ 4000 rpm. |
| Model Engine: | N20B20 | A14NEL | Z22SE |
| Engine position: | Front, longitudinal | Front, transverse | Front, transverse |
| Engine displacement: | 1997 cm3 | 1362 cm3 | 2198 cm3 |
| Engine oil capacity: | 4.75 l | 4.0 l | 5 l |
| Coolant: | 6.8 l | ||
| Fuel System: | Direct injection | Multi-point injection | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | Turbocharging | |
| Position of cylinders: | Inline | Inline | Inline |
| Valvetrain: | DOHC | ||
| Number of cylinders: | 4 | 4 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 10 | 9.5 | 10 |
| Piston Stroke: | 90.1 mm | 82.5 mm | 94.6 mm |
| Cylinder Bore: | 84 mm | 72.5 mm | 86 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 4 | ||
| Number of Gears (manual transmission): | 6 | 6 | |
| Length: | 4239 mm | 4466 mm | 4267 mm |
| Width: | 1790 mm | 1840 mm | 1709 mm |
| Width including mirrors: | 2020 mm | 1989 mm | |
| Height: | 1291 mm | 1482 mm | 1390 mm |
| Wheelbase: | 2496 mm | 2695 mm | 2606 mm |
| Front track: | 1511 mm | 1584 mm | 1474 mm |
| Rear (Back) track: | 1559 mm | 1588 mm | 1462 mm |
| Ride height(clearance): | 112 mm | ||
| Front overhang: | 812 mm | ||
| Rear overhang: | 849 mm | ||
| Minimum volume of Luggage (trunk): | 380 l | 330 l | |
| Maximum amount of Luggage (trunk): | 1165 l | ||
| Front suspension: | Independent, Spring McPherson, with stabilizer | ||
| Rear suspension: | Semi-independent, spring | ||
| Max weight: | 1725 kg | 1940 kg | 1785 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Disc | Disc | |
| Kerb Weight: | 1470 kg | 1437 kg | 1338 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 | |
| Minimum turning circle (turning diameter): | 11.4 m | 11 m | |
| Tire size: | 225/45 R17 W | 235/55 R17 | 215/40 R17 |
| Wheel rims size: | 8J x 17 | R17 | 7.5J x 17 |