1991 Alfa Romeo SZ vs. 2009 Cadillac STS
To start off, 2009 Cadillac STS is newer by 18 year(s). Which means there will be less support and parts availability for 1991 Alfa Romeo SZ. In addition, the cost of maintenance, including insurance, on 1991 Alfa Romeo SZ would be higher. At 4,565 cc (8 cylinders), 2009 Cadillac STS is equipped with a bigger engine. In terms of performance, 2009 Cadillac STS (321 HP @ 6400 RPM) has 113 more horse power than 1991 Alfa Romeo SZ. (208 HP @ 6200 RPM) In normal driving conditions, 2009 Cadillac STS should accelerate faster than 1991 Alfa Romeo SZ. With that said, vehicle weight also plays an important factor in acceleration. 2009 Cadillac STS weights approximately 560 kg more than 1991 Alfa Romeo SZ. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2009 Cadillac STS is four wheel drive (4WD), it will have significant more traction and grip than 1991 Alfa Romeo SZ. In wet, icy, snow, or gravel driving conditions, 2009 Cadillac STS will offer significantly more control. 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, 2009 Cadillac STS (427 Nm @ 4400 RPM) has 182 more torque (in Nm) than 1991 Alfa Romeo SZ. (245 Nm @ 4500 RPM). This means 2009 Cadillac STS will have an easier job in driving up hills or pulling heavy equipment than 1991 Alfa Romeo SZ. 2009 Cadillac STS has automatic transmission and 1991 Alfa Romeo SZ has manual transmission. 1991 Alfa Romeo SZ will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2009 Cadillac STS will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1991 Alfa Romeo SZ | 2009 Cadillac STS | |
| Make | Alfa Romeo | Cadillac |
| Model | SZ | STS |
| Year Released | 1991 | 2009 |
| Engine Position | Front | Front |
| Engine Size | 2959 cc | 4565 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 208 HP | 321 HP |
| Engine RPM | 6200 RPM | 6400 RPM |
| Torque | 245 Nm | 427 Nm |
| Torque RPM | 4500 RPM | 4400 RPM |
| Engine Bore Size | 93 mm | 93 mm |
| Engine Stroke Size | 72.6 mm | 84 mm |
| Engine Compression Ratio | 10.0:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 233 km/hour | 250 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1260 kg | 1820 kg |
| Vehicle Length | 4670 mm | 4990 mm |
| Vehicle Width | 1740 mm | 1850 mm |
| Vehicle Height | 1320 mm | 1470 mm |
| Wheelbase Size | 2520 mm | 2960 mm |
| Fuel Tank Capacity | 50 L | 66 L |
