Comparison Porsche 911 Cabriolet (991) Carrera 4S 3.8 (400 Hp) & Opel Astra H TwinTop 1.8i 16V ECOTEC (140 Hp)
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| Brand: | Porsche | Opel |
| Model: | 911 | Astra |
| Generation: | 911 Cabriolet (991) | Astra H TwinTop |
| Engine / modification: | Carrera 4S 3.8 (400 Hp) | 1.8i 16V ECOTEC (140 Hp) |
| Production start: | 2012 year | 2006 year |
| Production end: | 2010 year | |
| Coupe type: | Cabriolet | Coupe - Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2+2 | 4 |
| Fuel consumption / economy - urban: | 13.9 l/100 km | 10.3 l/100 km |
| Fuel consumption / economy - extra urban: | 7.7 l/100 km | 6.2 l/100 km |
| Fuel consumption / economy - combined: | 10.0 l/100 km | 7.7 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | |
| Fuel tank volume: | 68 l | 52 l |
| Emission standard: | EURO VI | EURO IV |
| CO2 emissions: | 235 g/km | 185 g/km |
| Power: | 400 hp | 140 hp |
| Max power in: | 7400 rpm. | 6300 rpm. |
| Maximum speed: | 296 km/h | 209 km/h |
| Acceleration from 0 to 100 km/h: | 4.7 sec | 11.4 sec |
| Torque: | 440 Nm/5600 rpm. | 175 Nm/3800 rpm. |
| Engine position: | Rear, longitudinal | Front, transverse |
| Engine displacement: | 3800 cm3 | 1796 cm3 |
| Fuel System: | Direct injection | Multi-point injection |
| Position of cylinders: | Boxer | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 12.5 | 10.5 |
| Piston Stroke: | 77.5 mm | 88.2 mm |
| Cylinder Bore: | 102 mm | 80.5 mm |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (manual transmission): | 7 | 5 |
| Length: | 4491 mm | 4476 mm |
| Width: | 1852 mm | 1759 mm |
| Width with mirrors folded: | 1831 mm | |
| Width including mirrors: | 2021 mm | |
| Height: | 1294 mm | 1411 mm |
| Wheelbase: | 2450 mm | 2614 mm |
| Front track: | 1538 mm | 1488 mm |
| Rear (Back) track: | 1552 mm | 1481 mm |
| Ride height(clearance): | 122 mm | |
| Front overhang: | 909 mm | |
| Rear overhang: | 953 mm | |
| Minimum volume of Luggage (trunk): | 285 l | 205 l |
| Maximum amount of Luggage (trunk): | 440 l | |
| Front suspension: | Independent type McPherson | Helical spring |
| Rear suspension: | Multi-link independent | Transverse stabilizer |
| Max weight: | 1935 kg | 1870 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1535 kg | 1400 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Minimum turning circle (turning diameter): | 11.2 m | |
| Tire size: | 245/35 ZR20; 305/30 ZR20 | 205/55 R16 |
| Wheel rims size: | 8.5 J x 20; 11 J x 20 | R16 |