Comparison BMW Z4 (E89) 20i (184 Hp) sDrive & Opel Astra H GTC 1.6i 16V (105 Hp)
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| Brand: | BMW | Opel |
| Model: | Z4 | Astra |
| Generation: | Z4 (E89) | Astra H GTC |
| Engine / modification: | 20i (184 Hp) sDrive | 1.6i 16V (105 Hp) |
| Production start: | 2011 year | 2005 year |
| Production end: | 2013 year | 2010 year |
| Coupe type: | Cabriolet | Hatchback |
| Num. of Doors: | 2 | 3 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 8.9 l/100 km | 8.6 l/100 km |
| Fuel consumption / economy - extra urban: | 5.6 l/100 km | 5.4 l/100 km |
| Fuel consumption / economy - combined: | 6.8 l/100 km | 6.6 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 55 l | 52 l |
| Emission standard: | EURO IV | |
| CO2 emissions: | 159 g/km | 158 g/km |
| Power: | 184 hp | 105 hp |
| Max power in: | 5000 rpm. | 6000 rpm. |
| Maximum speed: | 235 km/h | 187 km/h |
| Acceleration from 0 to 100 km/h: | 6.9 sec | 12.2 sec |
| Torque: | 270 Nm @ 1250-4500 rpm. | 150 Nm/3900 rpm. |
| Model Engine: | N20B20 | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 1997 cm3 | 1598 cm3 |
| Engine oil capacity: | 4.75 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | Inline | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 4 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 10.5 |
| 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 (automatic transmission): | 5 | |
| Number of Gears (manual transmission): | 6 | 5 |
| Length: | 4239 mm | 4290 mm |
| Width: | 1790 mm | 1753 mm |
| Width including mirrors: | 2033 mm | |
| Height: | 1291 mm | 1415 mm |
| Wheelbase: | 2496 mm | 2614 mm |
| Front track: | 1511 mm | 1488 mm |
| Rear (Back) track: | 1559 mm | 1488 mm |
| Ride height(clearance): | 140 mm | |
| Front overhang: | 910 mm | |
| Rear overhang: | 766 mm | |
| Minimum volume of Luggage (trunk): | 380 l | |
| Front suspension: | The depreciated rack | |
| Rear suspension: | The depreciated rack | |
| Max weight: | 1725 kg | 1720 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Disc | |
| Kerb Weight: | 1470 kg | 1145 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Tire size: | 225/45 R17 W | 205/55 R16 |
| Wheel rims size: | 8J x 17 | 6.5J x 16 |