2007 Cadillac STS vs. 1991 Porsche 928
To start off, 2007 Cadillac STS is newer by 16 year(s). Which means there will be less support and parts availability for 1991 Porsche 928. In addition, the cost of maintenance, including insurance, on 1991 Porsche 928 would be higher. At 4,663 cc (8 cylinders), 1991 Porsche 928 is equipped with a bigger engine. In terms of performance, 2007 Cadillac STS (320 HP @ 6400 RPM) has 14 more horse power than 1991 Porsche 928. (306 HP @ 5900 RPM). In normal driving conditions, 2007 Cadillac STS should accelerate faster than 1991 Porsche 928. With that said, vehicle weight also plays an important factor in acceleration. 2007 Cadillac STS weights approximately 108 kg more than 1991 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, 2007 Cadillac STS (427 Nm @ 4400 RPM) has 19 more torque (in Nm) than 1991 Porsche 928. (408 Nm @ 4100 RPM). This means 2007 Cadillac STS will have an easier job in driving up hills or pulling heavy equipment than 1991 Porsche 928. 2007 Cadillac STS has automatic transmission and 1991 Porsche 928 has manual transmission. 1991 Porsche 928 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 Cadillac STS will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2007 Cadillac STS | 1991 Porsche 928 | |
| Make | Cadillac | Porsche |
| Model | STS | 928 |
| Year Released | 2007 | 1991 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4565 cc | 4663 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 320 HP | 306 HP |
| Engine RPM | 6400 RPM | 5900 RPM |
| Torque | 427 Nm | 408 Nm |
| Torque RPM | 4400 RPM | 4100 RPM |
| Engine Bore Size | 93 mm | 97 mm |
| Engine Stroke Size | 84 mm | 78.9 mm |
| Engine Compression Ratio | 10.5:1 | 10.0:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1638 kg | 1530 kg |
| Vehicle Length | 4990 mm | 4530 mm |
| Vehicle Width | 1850 mm | 2060 mm |
| Vehicle Height | 1470 mm | 1290 mm |
| Wheelbase Size | 2960 mm | 2510 mm |
| Fuel Tank Capacity | 64 L | 76 L |
