Comparison Mercedes-Benz S-class Long (W221) S 450 (340 Hp) & Mercedes-Benz SLK Coupe (R171) AMG SLK 55 Black Series V8 (400 Hp) 7G-TRONIC
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | SLK |
| Generation: | S-class Long (W221) | SLK Coupe (R171) |
| Engine / modification: | S 450 (340 Hp) | AMG SLK 55 Black Series V8 (400 Hp) 7G-TRONIC |
| Production start: | 2006 year | 2006 year |
| Production end: | 2013 year | 2008 year |
| Coupe type: | Sedan | Coupe |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 16.5 l/100 km | |
| Fuel consumption / economy - extra urban: | 8.1 l/100 km | |
| Fuel consumption / economy - combined: | 11.2 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 90 l | 70 l |
| Emission standard: | Euro 4 | |
| Power: | 340 hp | 400 hp |
| Max power in: | 5750 rpm. | |
| Maximum speed: | 250 km/h | 280 km/h |
| Acceleration from 0 to 100 km/h: | 5.9 sec | 4.5 sec |
| Torque: | 520 Nm @ 3750 rpm. | |
| Model Engine: | M 113.989 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4663 cm3 | 5439 cm3 |
| Engine oil capacity: | 8 l | |
| Coolant: | 11.5 l | |
| Fuel System: | Multi-point injection | |
| Position of cylinders: | V engine | |
| Valvetrain: | SOHC | |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 3 | |
| Compression ratio: | 11 | |
| Piston Stroke: | 92 mm | |
| Cylinder Bore: | 97 mm | |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 | 7 |
| Length: | 5076 mm | 4087 mm |
| Width: | 1871 mm | 1794 mm |
| Height: | 1473 mm | 1271 mm |
| Wheelbase: | 3165 mm | 2430 mm |
| Front track: | 1600 mm | 1524 mm |
| Rear (Back) track: | 1606 mm | 1549 mm |
| Minimum volume of Luggage (trunk): | 560 l | 208 l |
| Maximum amount of Luggage (trunk): | 560 l | |
| Front suspension: | Pneumatic elastic element | |
| Rear suspension: | Pneumatic elastic element | |
| Max weight: | 2850 kg | 1790 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 2100 kg | 1420 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 50 kg | |
| Minimum turning circle (turning diameter): | 10.51 m | |
| Tire size: | 235/55 R17 | Front wheel tires: 235/35 R 19 ZR |