Which Fiat Siena Version to Buy: Engine and Generation Comparison
The Fiat Siena data points to different choices for different priorities. For the quickest measured performance, the original-generation 1.6 MT with 100 hp or 1.6 MT with 103 hp is the strongest documented option: both reach 100 km/h in 10.2 seconds and have a top speed of 186 km/h.
The Fiat Siena data points to different choices for different priorities. For the quickest measured performance, the original-generation 1.6 MT with 100 hp or 1.6 MT with 103 hp is the strongest documented option: both reach 100 km/h in 10.2 seconds and have a top speed of 186 km/h. For the highest output, the second-generation 1.6 MT delivers 115 hp, although its acceleration and top speed are not measured. Buyers considering smaller engines can choose between 1.0, 1.2, and 1.4 versions, while the original generation also includes two turbo Diesel 1.7 MT variants. Every listed Siena is a Sedan with a 5-speed Manual gearbox and FWD.
Fiat Siena generations: what changed?
The Siena catalogue contains 5 generation entries, but they describe 2 main generations, with 3 restylings included within the first generation.
The original first generation ran from 1996 to 2000 as a Sedan and offered 9 versions. It has the broadest engine selection: two 1.0 MT versions, one 1.2 MT, one 1.4 MT, three 1.6 MT versions, and two 1.7 MT versions. Outputs extend from 61 hp to 103 hp, and this is the only generation in the data with Diesel engines, Turbo boost, measured acceleration across every version, and measured top speeds across every version.
Restyling 1 ran from 2001 to June 2004. Its Sedan range was reduced to 2 versions, the 1.0 MT with 70 hp and 1.2 MT with 80 hp. Compared with their matching earlier versions, their basic performance remained close: the 70 hp car records the same 14.9-second acceleration and 160 km/h top speed, while the 80 hp version improves from 12.6 seconds to 12.0 seconds and retains a 168 km/h top speed.
Restyling 2 covered July 2004 to May 2012 and offered 2 Sedan versions. The 1.4 MT has 71 hp, while the 1.8 MT has 106 hp, a difference of 35 hp. The 1.4 records 12.9 seconds to 100 km/h and 164 km/h; both performance figures for the 1.8 are not measured.
Restyling 3 ran from July 2007 to September 2016, overlapping the later part of restyling 2. Its 3 Sedan versions are the 1.0 MT with 70 hp, 1.4 MT with 71 hp, and 1.8 MT with 106 hp. Acceleration and top speed are not measured for all three.
The second generation ran from March 2012 to January 2022 as a Sedan with 3 versions: 1.0 MT with 75 hp, 1.4 MT with 88 hp, and 1.6 MT with 115 hp. Relative to the third-restyling cars, output rose by 5 hp for the 1.0 and 17 hp for the 1.4. The 115 hp 1.6 is the most powerful Siena in the supplied data, but its acceleration, top speed, weight, clearance, and tank capacity are not measured.
Fiat Siena engine specs
Because several versions share the same name, power and production phase identify them precisely.
| Generation or restyling | Version | Power | Torque | Displacement | Fuel | Cylinders and layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|
| First generation | 1.0 MT, 61 hp | 61 hp | 79 Nm | 994 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.0 MT, 70 hp | 70 hp | 94 Nm | 999 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.2 MT, 80 hp | 80 hp | 114 Nm | 1242 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.4 MT, 71 hp | 71 hp | 161 Nm | 1372 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.6 MT, 87 hp | 87 hp | 125 Nm | 1581 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.6 MT, 100 hp | 100 hp | 140 Nm | 1581 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.6 MT, 103 hp | 103 hp | 140 Nm | 1581 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| First generation | 1.7 MT, 69 hp | 69 hp | 134 Nm | 1698 cc | Diesel | 4, Inline | Turbo | 5-speed Manual | FWD |
| First generation | 1.7 MT, 72 hp | 72 hp | 137 Nm | 1698 cc | Diesel | 4, Inline | Turbo | 5-speed Manual | FWD |
| Restyling 1 | 1.0 MT, 70 hp | 70 hp | 94 Nm | 999 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Restyling 1 | 1.2 MT, 80 hp | 80 hp | 114 Nm | 1242 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Restyling 2 | 1.4 MT, 71 hp | 71 hp | 108 Nm | 1372 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Restyling 2 | 1.8 MT, 106 hp | 106 hp | not measured | 1796 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Restyling 3 | 1.0 MT, 70 hp | 70 hp | 94 Nm | 999 cc | Gasoline | not measured | not measured | 5-speed Manual | FWD |
| Restyling 3 | 1.4 MT, 71 hp | 71 hp | not measured | 1372 cc | Gasoline | 4, Inline | not measured | 5-speed Manual | FWD |
| Restyling 3 | 1.8 MT, 106 hp | 106 hp | not measured | 1796 cc | Gasoline | 4, Inline | not measured | 5-speed Manual | FWD |
| Second generation | 1.0 MT, 75 hp | 75 hp | not measured | 999 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Second generation | 1.4 MT, 88 hp | 88 hp | not measured | 1372 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
| Second generation | 1.6 MT, 115 hp | 115 hp | 159 Nm | 1598 cc | Gasoline | 4, Inline | No | 5-speed Manual | FWD |
Power per litre helps separate engines that otherwise look similar. The original 1.0 MT with 61 hp produces about 61.4 hp per litre, while the 70 hp 999 cc versions produce about 70.1 hp per litre. The first-generation 1.2 MT produces about 64.4 hp per litre. Among the three early 1581 cc engines, output rises from about 55.0 hp per litre at 87 hp to 63.3 at 100 hp and 65.1 at 103 hp. The second-generation 1.6 MT reaches about 72.0 hp per litre, the highest calculated value in this catalogue.
Performance, mpg and economy data
The fastest measured Siena versions are the first-generation 1.6 MT with 100 hp and 1.6 MT with 103 hp. Each accelerates to 100 km/h in 10.2 seconds and reaches 186 km/h. The 103 hp car provides 3 hp more but no measured acceleration or top-speed advantage over the 100 hp version.
The first-generation 1.6 MT with 87 hp takes 11.5 seconds and reaches 175 km/h. Moving to either faster 1.6 cuts at least 1.3 seconds from the acceleration time and adds 11 km/h in top speed.
The 1.2 MT with 80 hp is a useful middle choice. Its first-generation form records 12.6 seconds and 168 km/h, while restyling 1 records 12.0 seconds and the same 168 km/h. The 1.4 MT with 71 hp records 12.9 seconds and 164 km/h in both the original generation and restyling 2.
The early 70 hp 1.0 MT takes 14.9 seconds and reaches 160 km/h. The 61 hp version takes 17.0 seconds and reaches 152 km/h, making the 70 hp car 2.1 seconds quicker to 100 km/h and 8 km/h faster at the top end.
Both turbo Diesel 1.7 MT versions record 14.8 seconds and 164 km/h. Their outputs differ by 3 hp, and torque increases from 134 Nm to 137 Nm, but the measured performance is identical.
City fuel consumption is not measured for every listed version. Highway fuel consumption is not measured for every version, and combined fuel consumption is also not measured throughout. Consequently, an mpg comparison cannot be supported by the supplied figures.
Fiat Siena dimensions, weight and size
Exterior length, width, and height are not measured for every version. Wheel sizes are also not measured across the catalogue.
For versions with recorded figures, kerb weight ranges from 990 kg for the first-generation 1.0 MT with 61 hp to 1070 kg for the first-generation 1.7 MT with 69 hp. Gross weight ranges from 1390 kg to 1560 kg, while the first-generation 1.6 MT with 103 hp has a gross weight that is not measured.
The 61 hp 1.0 MT has 16.2 kg per hp. The 70 hp first-generation 1.0 MT has about 14.6 kg per hp, and the 1.2 MT with 80 hp has 13.0 kg per hp. The early 1.6 MT with 100 hp improves to 10.5 kg per hp, while the 103 hp version reaches about 10.3 kg per hp. These figures reinforce the measured acceleration ranking.
All first-generation and restyled versions with available chassis data have 140 mm of ground clearance and a 48-litre tank. For every second-generation version, ground clearance and tank capacity are not measured. Their kerb and gross weights are likewise not measured, preventing a direct weight-per-horsepower comparison with earlier cars.
Which Fiat Siena version should you choose?
Choose the first-generation 1.6 MT with 100 hp if documented acceleration matters most. It matches the 103 hp version’s 10.2-second result and 186 km/h top speed while carrying 15 kg less kerb weight: 1050 kg versus 1065 kg.
Choose the first-generation 1.6 MT with 103 hp if the highest output among the fully measured early 1.6 cars matters more. It has 140 Nm, the same as the 100 hp version, although peak torque arrives at 4500 rpm instead of 3000 rpm.
Choose the restyling 1 1.2 MT with 80 hp as the strongest documented small-engine compromise. It is 2.9 seconds quicker to 100 km/h than the contemporary 70 hp 1.0 MT, reaches a top speed 8 km/h higher, and adds 20 kg of kerb weight.
Choose one of the first-generation turbo Diesel 1.7 MT versions only when that specific fuel and boost combination is the priority. The 72 hp version adds 3 hp and 3 Nm over the 69 hp version while weighing 20 kg less, yet both record 14.8 seconds and 164 km/h.
Choose the second-generation 1.6 MT with 115 hp for maximum catalogue output. It provides 27 hp more than the second-generation 1.4 and 40 hp more than the second-generation 1.0. Its disadvantage is uncertainty: acceleration, top speed, consumption, weight, tank capacity, clearance, and wheel size are all not measured.
The supplied data does not document Fiat Siena problems, reliability, service-manual content, engine timing marks, engine diagrams, or sale prices. Those topics therefore cannot determine a version recommendation here. Based strictly on comparable specifications, the first-generation 1.6 MT with 100 hp offers the clearest performance case, while the restyling 1 1.2 MT with 80 hp is the most convincing lower-output alternative.