Comparison Porsche Cayman (987c, facelift 2009) 2.9 (265 Hp) & GMC Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box 6.6 Duramax TD V8 (397 Hp) Automatic
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| Brand: | Porsche | GMC |
| Model: | Cayman | Sierra 2500HD |
| Generation: | Cayman (987c, facelift 2009) | Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box |
| Engine / modification: | 2.9 (265 Hp) | 6.6 Duramax TD V8 (397 Hp) Automatic |
| Production start: | 2009 year | 2015 year |
| Production end: | 2012 year | 2017 year |
| Coupe type: | Coupe | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2 | 2 |
| Fuel consumption / economy - urban: | 13.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.9 l/100 km | |
| Fuel consumption / economy - combined: | 9.4 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.29 | |
| Fuel tank volume: | 65 l | 136 l |
| Emission standard: | Euro 5 | |
| CO2 emissions: | 221 g/km | |
| Power: | 265 hp | 397 hp |
| Max power in: | 7200 rpm. | 3000 rpm. |
| Maximum speed: | 265 km/h | |
| Acceleration from 0 to 100 km/h: | 5.8 sec | |
| Acceleration from 0 to 200 km/h: | 22 sec | |
| Torque: | 300 Nm @ 4400-6000 rpm. | 1037 Nm @ 1600 rpm. |
| Stopping distance 100 km/h - 0: | 34.3 m | |
| Model Engine: | MA1.20 | Duramax LML |
| Engine position: | Middle, longitudinal | |
| Engine displacement: | 2893 cm3 | 6599 cm3 |
| Engine oil capacity: | 7.5 l | 9.5 l |
| Coolant: | 23 l | 22.4 l |
| Maximum engine speed: | 7500 rpm. | |
| Position of cylinders: | Boxer | |
| Valvetrain: | DOHC | OHV |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11.5 | 16 |
| Piston Stroke: | 77.5 mm | 99 mm |
| Cylinder Bore: | 89 mm | 103 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4347 mm | 5699 mm |
| Width: | 1801 mm | |
| Width including mirrors: | 1978 mm | 2035 mm |
| Height: | 1304 mm | 1976 mm |
| Wheelbase: | 2415 mm | 3393 mm |
| Front track: | 1490 mm | 1748 mm |
| Rear (Back) track: | 1534 mm | 1709 mm |
| Ride height(clearance): | 130 mm | 231 mm |
| Minimum volume of Luggage (trunk): | 260 l | |
| Maximum amount of Luggage (trunk): | 2162 l | |
| Front suspension: | Independent type McPherson | |
| Rear suspension: | McPherson | |
| Max weight: | 1635 kg | 4491 kg |
| Kerb Weight: | 1330 kg | 2993 kg |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 60 kg | |
| Minimum turning circle (turning diameter): | 11.1 m | 14 m |
| Permitted trailer load with brakes (12%): | 6577 kg | |
| Tire size: | Front wheel tires: 205/55 ZR 17 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | Front wheel rims: 7 J x 17 | 7.5J x 17; 8J x 18; 8.5J x 20 |