Comparison Porsche 911 Cabriolet (991 II) Turbo 3.8 (540 Hp) PDK 4x4 & GMC Sierra 1500 III (GMT900) Regular Cab Long Box 4.8 Vortec V8 (302 Hp) 4WD Automatic FlexFuel
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| Brand: | Porsche | GMC |
| Model: | 911 | Sierra 1500 |
| Generation: | 911 Cabriolet (991 II) | Sierra 1500 III (GMT900) Regular Cab Long Box |
| Engine / modification: | Turbo 3.8 (540 Hp) PDK 4x4 | 4.8 Vortec V8 (302 Hp) 4WD Automatic FlexFuel |
| Production start: | 2015 year | 2010 year |
| Production end: | 2013 year | |
| Coupe type: | Cabriolet | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2+2 | 3 |
| Fuel consumption / economy - urban: | 12.1 l/100 km | 18.1 l/100 km |
| Fuel consumption / economy - extra urban: | 7.6 l/100 km | 13.1 l/100 km |
| Fuel consumption / economy - combined: | 9.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol / Ethanol - E85 |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 68 l | 128 l |
| Emission standard: | EURO VI | |
| CO2 emissions: | 216 g/km | |
| Power: | 540 hp | 302 hp |
| Max power in: | 6400 rpm. | 5600 rpm. |
| Maximum speed: | 320 km/h | |
| Acceleration from 0 to 100 km/h: | 3.1 sec | |
| Torque: | 710 Nm/2250-4000 rpm. | 414 Nm @ 4600 rpm. |
| Model Engine: | L20 | |
| Engine position: | Rear, longitudinal | |
| Engine displacement: | 3800 cm3 | 4807 cm3 |
| Engine oil capacity: | 10.4 l | 5.7 l |
| Coolant: | 12.7 l | |
| Fuel System: | Direct injection | |
| Maximum engine speed: | 6000 rpm. | |
| Aspiration / Turbine: | BiTurbo | Naturally aspirated engine |
| Position of cylinders: | Boxer | |
| Valvetrain: | OHV | |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 9.8 | 8.8 |
| Piston Stroke: | 77.5 mm | 83.06 mm |
| Cylinder Bore: | 102 mm | 96.01 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7 PDK | |
| Length: | 4507 mm | 5702 mm |
| Width: | 1880 mm | |
| Width including mirrors: | 1978 mm | 2031 mm |
| Height: | 1294 mm | 1872 mm |
| Wheelbase: | 2450 mm | 3378 mm |
| Front track: | 1541 mm | 1732 mm |
| Rear (Back) track: | 1590 mm | 1702 mm |
| Ride height(clearance): | 241 mm | |
| Approach angle: | 16.3 ° | |
| Departure angle: | 23.3 ° | |
| Minimum volume of Luggage (trunk): | 115 l | |
| Maximum amount of Luggage (trunk): | 160 l | 2138 l |
| Front suspension: | Independent type McPherson | |
| Rear suspension: | Multi-link independent | |
| Max weight: | 2065 kg | 3084 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1665 kg | |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 15.4 m | |
| Tire size: | 245/35 ZR 20; 305/30 ZR 20 | 245/70 R17 |
| Wheel rims size: | 9 J x 20; 11.5 J x 20 | 7.5J x 17 |