Comparison Mercedes-Benz R-class (W251) R 500 V8 (306 Hp) 4MATIC 7G-TRONIC & Ford Shelby I Cobra GT 500 7.0 V8 (365 Hp) Automatic
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| Brand: | Mercedes-Benz | Ford |
| Model: | R-class | Shelby |
| Generation: | R-class (W251) | Shelby I |
| Engine / modification: | R 500 V8 (306 Hp) 4MATIC 7G-TRONIC | Cobra GT 500 7.0 V8 (365 Hp) Automatic |
| Production start: | 2005 year | 1968 year |
| Production end: | 2007 year | 1970 year |
| Coupe type: | Combi | Coupe |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 6 | 4 |
| Fuel consumption / economy - combined: | 13.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.47 | |
| Fuel tank volume: | 80 l | 64 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 317 g/km | |
| Power: | 306 hp | 365 hp |
| Max power in: | 5600 rpm. | 5400 rpm. |
| Maximum speed: | 245 km/h | |
| Acceleration from 0 to 100 km/h: | 6.9 sec | |
| Torque: | 460 Nm @ 2700-4750 rpm. | 569 Nm @ 3200 rpm. |
| Model Engine: | M 113.971 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4966 cm3 | 6997 cm3 |
| Engine oil capacity: | 8.5 l | |
| Coolant: | 10.1-13 l | |
| Fuel System: | Multi-point injection | Carburettor |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | SOHC | |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 3 | 4 |
| Compression ratio: | 10 | 10.5 |
| Piston Stroke: | 84 mm | 101.19 mm |
| Cylinder Bore: | 97 mm | 104.9 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 3 |
| Length: | 4922 mm | 4740 mm |
| Width: | 1922 mm | 1801 mm |
| Width with mirrors folded: | 1306 mm | |
| Width including mirrors: | 2168 mm | |
| Height: | 1661 mm | |
| Wheelbase: | 2980 mm | 2743 mm |
| Front track: | 1665 mm | 1476 mm |
| Rear (Back) track: | 1658 mm | 1476 mm |
| Front overhang: | 922 mm | |
| Rear overhang: | 1020 mm | |
| Minimum volume of Luggage (trunk): | 550 l | |
| Maximum amount of Luggage (trunk): | 1950 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 2865 kg | |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Ventilated discs | Drum |
| Kerb Weight: | 2115 kg | 1575 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 100 kg | |
| Minimum turning circle (turning diameter): | 11.7 m | 11.6 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 255/55 R18; 255/50 R19 | |
| Wheel rims size: | 8J x 18; 8J x 19 |