Comparison GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box 6.6 Duramax TD V8 (397 Hp) SRW Automatic & Ferrari Testarossa 4.9 i V12 48V (380 Hp)
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| Brand: | GMC | Ferrari |
| Model: | Sierra 3500HD | Testarossa |
| Generation: | Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box | Testarossa |
| Engine / modification: | 6.6 Duramax TD V8 (397 Hp) SRW Automatic | 4.9 i V12 48V (380 Hp) |
| Production start: | 2011 year | 1984 year |
| Production end: | 2013 year | 1992 year |
| Coupe type: | Pick-up | Coupe |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 23.2 l/100 km | |
| Fuel consumption / economy - extra urban: | 10 l/100 km | |
| Fuel consumption / economy - combined: | 11.4 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 136 l | 115 l |
| Power: | 397 hp | 380 hp |
| Max power in: | 3000 rpm. | 5750 rpm. |
| Maximum speed: | 285 km/h | |
| Acceleration from 0 to 100 km/h: | 5.7 sec | |
| Torque: | 1037 Nm @ 1600 rpm. | 474 Nm @ 4500 rpm. |
| Model Engine: | Duramax LML | F113 |
| Engine displacement: | 6599 cm3 | 4942 cm3 |
| Engine oil capacity: | 9.5 l | 15.5 l |
| Coolant: | 24 l | 20 l |
| Fuel System: | Multi-point injection | |
| Maximum engine speed: | 3000 rpm. | |
| Position of cylinders: | V engine | |
| Valvetrain: | OHV | |
| Number of cylinders: | 8 | 12 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16 | 8.8 |
| Piston Stroke: | 99 mm | 78 mm |
| Cylinder Bore: | 103 mm | 82 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | - | |
| Number of Gears (manual transmission): | 5 | |
| Length: | 6337 mm | 4485 mm |
| Width: | 1975 mm | |
| Width including mirrors: | 2436 mm | |
| Height: | 1966 mm | 1130 mm |
| Wheelbase: | 4018 mm | 2550 mm |
| Front track: | 1748 mm | 1520 mm |
| Rear (Back) track: | 1709 mm | 1660 mm |
| Ride height(clearance): | 221 mm | |
| Maximum amount of Luggage (trunk): | 2138 l | |
| Front suspension: | Independent torsion bar, double wishbone | Coil spring |
| Rear suspension: | Helical spring | |
| Max weight: | 5080 kg | 1900 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 3057 kg | 1700 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 15.8 m | |
| Permitted trailer load with brakes (12%): | 5897 kg | |
| Tire size: | 235/80 R17; 265/70 R18 | 225/50 R16 |