2005 Ford Shelby GR-1 Concept vs. 1981 Porsche 928
To start off, 2005 Ford Shelby GR-1 Concept is newer by 24 year(s). Which means there will be less support and parts availability for 1981 Porsche 928. In addition, the cost of maintenance, including insurance, on 1981 Porsche 928 would be higher. At 6,392 cc (10 cylinders), 2005 Ford Shelby GR-1 Concept is equipped with a bigger engine. In terms of performance, 2005 Ford Shelby GR-1 Concept (605 HP @ 6750 RPM) has 367 more horse power than 1981 Porsche 928. (238 HP @ 5250 RPM). In normal driving conditions, 2005 Ford Shelby GR-1 Concept should accelerate faster than 1981 Porsche 928. With that said, vehicle weight also plays an important factor in acceleration. 2005 Ford Shelby GR-1 Concept weights approximately 319 kg more than 1981 Porsche 928. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2005 Ford Shelby GR-1 Concept (679 Nm @ 5500 RPM) has 323 more torque (in Nm) than 1981 Porsche 928. (356 Nm @ 3600 RPM). This means 2005 Ford Shelby GR-1 Concept will have an easier job in driving up hills or pulling heavy equipment than 1981 Porsche 928.
Compare all specifications:
| 2005 Ford Shelby GR-1 Concept | 1981 Porsche 928 | |
| Make | Ford | Porsche |
| Model | Shelby GR-1 Concept | 928 |
| Year Released | 2005 | 1981 |
| Body Type | Coupe | Coupe |
| Engine Position | Front | Front |
| Engine Size | 6392 cc | 4472 cc |
| Engine Cylinders | 10 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 605 HP | 238 HP |
| Engine RPM | 6750 RPM | 5250 RPM |
| Torque | 679 Nm | 356 Nm |
| Torque RPM | 5500 RPM | 3600 RPM |
| Engine Bore Size | 93.1 mm | 95 mm |
| Engine Stroke Size | 94 mm | 78.9 mm |
| Engine Compression Ratio | 10.8:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1769 kg | 1450 kg |
| Vehicle Length | 4420 mm | 4450 mm |
| Vehicle Width | 1900 mm | 1840 mm |
| Vehicle Height | 1170 mm | 1320 mm |
| Wheelbase Size | 2550 mm | 2510 mm |
| Fuel Tank Capacity | 132 L | 85 L |
