Comparison Porsche 911 GT3 3.8 (475 Hp) PDK & Opel Astra H GTC 1.8i (140 Hp)
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| Brand: | Porsche | Opel |
| Model: | 911 | Astra |
| Generation: | 911 GT3 | Astra H GTC |
| Engine / modification: | 3.8 (475 Hp) PDK | 1.8i (140 Hp) |
| Production start: | 2013 year | 2005 year |
| Production end: | 2010 year | |
| Coupe type: | Coupe | Hatchback |
| Num. of Doors: | 2 | 3 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 18.9 l/100 km | 10.4 l/100 km |
| Fuel consumption / economy - extra urban: | 8.9 l/100 km | 6.1 l/100 km |
| Fuel consumption / economy - combined: | 12.4 l/100 km | 7.7 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 64 l | 52 l |
| Emission standard: | EURO V | EURO IV |
| CO2 emissions: | 289 g/km | 175 g/km |
| Power: | 475 hp | 140 hp |
| Max power in: | 8250 rpm. | 6300 rpm. |
| Maximum speed: | 315 km/h | 209 km/h |
| Acceleration from 0 to 100 km/h: | 3.5 sec | 10.1 sec |
| Torque: | 440 Nm/6250 rpm. | 175 Nm/3800 rpm. |
| Engine position: | Rear, longitudinal | Front, transverse |
| Engine displacement: | 3799 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: | 12.9 | 10.5 |
| Piston Stroke: | 77.5 mm | 88.2 mm |
| Cylinder Bore: | 102 mm | 80.5 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 7 PDK | 4 |
| Number of Gears (manual transmission): | 5 | |
| Length: | 4545 mm | 4290 mm |
| Width: | 1852 mm | 1753 mm |
| Width including mirrors: | 2033 mm | |
| Height: | 1269 mm | 1415 mm |
| Wheelbase: | 2457 mm | 2614 mm |
| Front track: | 1551 mm | 1488 mm |
| Rear (Back) track: | 1555 mm | 1488 mm |
| Ride height(clearance): | 140 mm | |
| Front overhang: | 910 mm | |
| Rear overhang: | 766 mm | |
| Minimum volume of Luggage (trunk): | 385 l | 380 l |
| Front suspension: | Independent type McPherson | The depreciated rack |
| Rear suspension: | Multi-link independent | The depreciated rack |
| Max weight: | 1720 kg | 1785 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1430 kg | 1210 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Tire size: | 245/35 ZR20; 305/30 ZR20 | 205/55 R16 |
| Wheel rims size: | 9 J x 20; 12 J x 20 | 6.5J x 16 |