Comparison Porsche 911 (991 II) Turbo S 3.8 (580 Hp) PDK & GMC Sierra 2500HD V (GMTT1XX) Double Cab Long Bed 6.6 Duramax TD V8 (445 Hp) Automatic & Porsche 911 (991 II) Turbo 3.8 (540 Hp) PDK
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| Brand: | Porsche | GMC | Porsche |
| Model: | 911 | Sierra 2500HD | 911 |
| Generation: | 911 (991 II) | Sierra 2500HD V (GMTT1XX) Double Cab Long Bed | 911 (991 II) |
| Engine / modification: | Turbo S 3.8 (580 Hp) PDK | 6.6 Duramax TD V8 (445 Hp) Automatic | Turbo 3.8 (540 Hp) PDK |
| Production start: | 2015 year | 2020 year | 2015 year |
| Production end: | 2018 year | 2023 year | 2018 year |
| Coupe type: | Coupe | Pick-up | Coupe |
| Powertrain Architecture: | Internal Combustion engine | ||
| Num. of Doors: | 2 | 4 | 2 |
| Num. of seats: | 2+2 | 5 | 2+2 |
| Fuel consumption / economy - urban: | 11.8 l/100 km | 11.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.5 l/100 km | 7.5 l/100 km | |
| Fuel consumption / economy - combined: | 9.1 l/100 km | 9.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | 0.31 | |
| Fuel tank volume: | 68 l | 136 l | 68 l |
| Emission standard: | Euro 6 | Euro 6 | |
| CO2 emissions: | 212 g/km | 212 g/km | |
| Power: | 580 hp | 445 hp | 540 hp |
| Max power in: | 6750 rpm. | 2800 rpm. | 6400 rpm. |
| Maximum speed: | 330 km/h | 320 km/h | |
| Acceleration from 0 to 100 km/h: | 2.9 sec | 3.0 sec | |
| Torque: | 750 Nm @ 2250-4000 rpm. | 1234 Nm @ 1600 rpm. | 710 Nm @ 2250-4000 rpm. |
| Model Engine: | MDA.CA | Duramax L5P | MDA.BA |
| Engine position: | Rear, longitudinal | Rear, longitudinal | |
| Engine displacement: | 3800 cm3 | 6604 cm3 | 3800 cm3 |
| Engine oil capacity: | 7.5 l | 9.5 l | 7.5 l |
| Coolant: | 29.1 l | ||
| Fuel System: | Direct injection | Direct injection | |
| Aspiration / Turbine: | BiTurbo | BiTurbo | |
| Position of cylinders: | Boxer | Boxer | |
| Valvetrain: | OHV | ||
| Number of cylinders: | 6 | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 9.8 | 16 | 9.8 |
| Piston Stroke: | 77.5 mm | 99 mm | 77.5 mm |
| Cylinder Bore: | 102 mm | 103 mm | 102 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7 PDK | 7 PDK | |
| Length: | 4507 mm | 6514 mm | 4507 mm |
| Width: | 1880 mm | 1880 mm | |
| Width including mirrors: | 1978 mm | 2079 mm | 1978 mm |
| Height: | 1297 mm | 2027 mm | 1297 mm |
| Wheelbase: | 2450 mm | 4127 mm | 2450 mm |
| Front track: | 1541 mm | 1731 mm | 1541 mm |
| Rear (Back) track: | 1590 mm | 1736 mm | 1590 mm |
| Ride height(clearance): | 258 mm | ||
| Minimum volume of Luggage (trunk): | 115 l | 115 l | |
| Maximum amount of Luggage (trunk): | 260 l | 260 l | |
| Front suspension: | Independent type McPherson | Independent type McPherson | |
| Rear suspension: | Multi-link independent | Multi-link independent | |
| Max weight: | 1990 kg | 4944 kg | 2010 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Ventilated discs | Ventilated discs | |
| Kerb Weight: | 1600 kg | 3374 kg | 1595 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | ||
| Permitted trailer load with brakes (12%): | 6577 kg | ||
| Tire size: | 245/35 ZR 20; 305/30 ZR 20 | 265/70 R17; 245/75 R17; 265/70 R18; 265/60 R20 | 245/35 ZR 20; 305/30 ZR 20 |
| Wheel rims size: | 9J x 20; 11.5J x 20 | 7.5J x 17; 8J x 18; 8.5J x 20 | 9J x 20; 11.5J x 20 |