Comparison Porsche Cayman (987c, facelift 2009) 2.9 (265 Hp) PDK & BMW 6 Series Convertible (F12) 640i (320 Hp) Steptronic
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| Brand: | Porsche | BMW |
| Model: | Cayman | 6 Series |
| Generation: | Cayman (987c, facelift 2009) | 6 Series Convertible (F12) |
| Engine / modification: | 2.9 (265 Hp) PDK | 640i (320 Hp) Steptronic |
| Production start: | 2009 year | 2011 year |
| Production end: | 2012 year | 2015 year |
| Coupe type: | Coupe | Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2 | 4 |
| Fuel consumption / economy - urban: | 13.6 l/100 km | 10.9 l/100 km |
| Fuel consumption / economy - extra urban: | 6.4 l/100 km | 6.2 l/100 km |
| Fuel consumption / economy - combined: | 9.1 l/100 km | 7.9 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.29 | 0.31 |
| Fuel tank volume: | 65 l | 70 l |
| Emission standard: | Euro 5 | Euro 5 |
| CO2 emissions: | 214 g/km | 185 g/km |
| Power: | 265 hp | 320 hp |
| Max power in: | 7200 rpm. | 5800-6000 rpm. |
| Maximum speed: | 263 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5.7 sec | 5.7 sec |
| Acceleration from 0 to 200 km/h: | 21.8 sec | |
| Torque: | 300 Nm @ 4400-6000 rpm. | 450 Nm @ 1300-4500 rpm. |
| Stopping distance 100 km/h - 0: | 33.4 m | |
| Model Engine: | MA1.20 | N55B30 |
| Engine position: | Middle, longitudinal | Front, longitudinal |
| Engine displacement: | 2893 cm3 | 2979 cm3 |
| Engine oil capacity: | 7.5 l | 6.5 l |
| Coolant: | 23 l | 10.2 l |
| Fuel System: | Direct injection | |
| Maximum engine speed: | 7500 rpm. | |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | Boxer | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11.5 | 10.2 |
| Piston Stroke: | 77.5 mm | 89.6 mm |
| Cylinder Bore: | 89 mm | 84 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 | 8 Steptronic |
| Length: | 4347 mm | 4894 mm |
| Width: | 1801 mm | 1894 mm |
| Width including mirrors: | 1978 mm | |
| Height: | 1304 mm | 1365 mm |
| Wheelbase: | 2415 mm | 2855 mm |
| Front track: | 1490 mm | 1600 mm |
| Rear (Back) track: | 1534 mm | 1665 mm |
| Ride height(clearance): | 130 mm | 123 mm |
| Minimum volume of Luggage (trunk): | 260 l | 300 l |
| Maximum amount of Luggage (trunk): | 350 l | |
| Front suspension: | Independent type McPherson | Double wishbone |
| Rear suspension: | McPherson | Multi-link independent |
| Max weight: | 1670 kg | 2290 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1360 kg | 1840 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 60 kg | |
| Minimum turning circle (turning diameter): | 11.1 m | 11.7 m |
| Tire size: | Front wheel tires: 205/55 ZR 17 | 225/55 R17 97Y |
| Wheel rims size: | Front wheel rims: 7 J x 17 | 8J x 17 |