Comparison Porsche 911 (991 II) Carrera GTS 3.0 (450 Hp) PDK & Pontiac Grand AM (H) 3.1 i V6 (155 Hp)
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| Brand: | Porsche | Pontiac |
| Model: | 911 | Grand AM |
| Generation: | 911 (991 II) | Grand AM (H) |
| Engine / modification: | Carrera GTS 3.0 (450 Hp) PDK | 3.1 i V6 (155 Hp) |
| Production start: | 2017 year | 1992 year |
| Production end: | 2018 year | 1998 year |
| Coupe type: | Coupe | Sedan |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 2+2 | 5 |
| Fuel consumption / economy - urban: | 10.7 l/100 km | 11.7 l/100 km |
| Fuel consumption / economy - extra urban: | 6.9 l/100 km | 8.1 l/100 km |
| Fuel consumption / economy - combined: | 8.3 l/100 km | 9.8 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | |
| Fuel tank volume: | 64 l | 57 l |
| Emission standard: | Euro 6 | |
| CO2 emissions: | 188 g/km | |
| Power: | 450 hp | 155 hp |
| Max power in: | 6500 rpm. | 5200 rpm. |
| Maximum speed: | 310 km/h | |
| Acceleration from 0 to 100 km/h: | 3.7 sec | |
| Acceleration from 0 to 200 km/h: | 12.4 sec | |
| Torque: | 550 Nm @ 2150−5000 rpm. | 251 Nm/4000 rpm. |
| Model Engine: | MDC.JA | |
| Engine position: | Rear, longitudinal | Front, transverse |
| Engine displacement: | 2981 cm3 | 3135 cm3 |
| Engine oil capacity: | 8 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Maximum engine speed: | 7500 rpm. | |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | Boxer | V engine |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 10 | 9.6 |
| Piston Stroke: | 76.4 mm | 84 mm |
| Cylinder Bore: | 91 mm | 89 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 7 PDK | 4 |
| Length: | 4528 mm | 4730 mm |
| Width: | 1852 mm | 1790 mm |
| Width including mirrors: | 1978 mm | |
| Height: | 1284 mm | 1400 mm |
| Wheelbase: | 2450 mm | 2718 mm |
| Front track: | 1541 mm | 1500 mm |
| Rear (Back) track: | 1544 mm | 1500 mm |
| Minimum volume of Luggage (trunk): | 415 l | |
| Maximum amount of Luggage (trunk): | 385 l | |
| Front suspension: | Independent type McPherson | The depreciated rack |
| Rear suspension: | Multi-link independent | The depreciated rack |
| Max weight: | 1935 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Drum |
| Kerb Weight: | 1470 kg | |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 11.1 m | |
| Tire size: | 245/35 ZR 20; 305/30 ZR 20 | 215/60 R15 |
| Wheel rims size: | 9J x 20; 12J x 20 |