2008 BMW Z4 3.0i Roadster vs. 2008 BMW Z4 3.0si Roadster
To start off, both 2008 BMW Z4 3.0i Roadster and 2008 BMW Z4 3.0si Roadster were released in the same year (2008). Therefore the support and the availability on parts for both vehicles should be relatively similar. At 2,996 cc (6 cylinders), 2008 BMW Z4 3.0si Roadster is equipped with a bigger engine. In terms of performance, 2008 BMW Z4 3.0si Roadster (255 HP @ 6600 RPM) has 40 more horse power than 2008 BMW Z4 3.0i Roadster. (215 HP @ 6250 RPM) In normal driving conditions, 2008 BMW Z4 3.0si Roadster should accelerate faster than 2008 BMW Z4 3.0i Roadster. With that said, vehicle weight also plays an important factor in acceleration. 2008 BMW Z4 3.0i Roadster weights approximately 10 kg more than 2008 BMW Z4 3.0si Roadster.
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, 2008 BMW Z4 3.0si Roadster (299 Nm @ 2750 RPM) has 48 more torque (in Nm) than 2008 BMW Z4 3.0i Roadster. (251 Nm @ 2750 RPM). This means 2008 BMW Z4 3.0si Roadster will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW Z4 3.0i Roadster.
Compare all specifications:
| 2008 BMW Z4 3.0i Roadster | 2008 BMW Z4 3.0si Roadster | |
| Make | BMW | BMW |
| Model | Z4 | Z4 |
| Year Released | 2008 | 2008 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2994 cc | 2996 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 215 HP | 255 HP |
| Engine RPM | 6250 RPM | 6600 RPM |
| Torque | 251 Nm | 299 Nm |
| Torque RPM | 2750 RPM | 2750 RPM |
| Fuel Type | Gasoline | Gasoline |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 5.7 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1395 kg | 1385 kg |
| Vehicle Length | 4100 mm | 4100 mm |
| Vehicle Width | 1790 mm | 1310 mm |
| Vehicle Height | 1300 mm | 1790 mm |
| Wheelbase Size | 2500 mm | 2500 mm |
| Fuel Consumption | 8.4 L/100km | 8.4 L/100km |
| Fuel Consumption City | 13.1 L/100km | 11.8 L/100km |
| Fuel Consumption Overall | 11.2 L/100km | 8.6 L/100km |
| Fuel Tank Capacity | 55 L | 55 L |
