Isdera Spyder: Which Version to Buy and Why
The Isdera Spyder catalogue contains one generation, produced from 1983 to 1993 as a Roadster, so there is no choice between generations or body styles. The real decision is between four versions: 1.8 MT with 136 hp, 2.3 MT with 136 hp, 3.0 MT with 180 hp, and 3.0 MT with 235 hp. All use Gasoline, a 5-speed Manual gearbox, RWD, no boost, and multi-point distributed injection.
The Isdera Spyder catalogue contains one generation, produced from 1983 to 1993 as a Roadster, so there is no choice between generations or body styles. The real decision is between four versions: 1.8 MT with 136 hp, 2.3 MT with 136 hp, 3.0 MT with 180 hp, and 3.0 MT with 235 hp. All use Gasoline, a 5-speed Manual gearbox, RWD, no boost, and multi-point distributed injection. The 3.0 MT with 235 hp is the clear performance choice because it is the only version with measured acceleration and maximum speed, while the two 136 hp versions are best separated by torque and engine character rather than peak output.
Isdera Spyder generations and version choice
The sole Isdera Spyder generation ran from 1983 to 1993. It was offered only as a Roadster and contains four catalogue versions. No separate restyling or later generation is listed, so there are no documented generational changes to compare. Buyers instead need to weigh four-cylinder against six-cylinder engines, two or four valves per cylinder, and outputs ranging from 136 hp to 235 hp.
Two entries share the exact name 3.0 MT and must be distinguished by power. The 180 hp 3.0 MT has two valves per cylinder, whereas the 235 hp 3.0 MT has four valves per cylinder. Both displace 2,960 cc, but their power, torque, compression ratio, and measured performance differ.
Isdera Spyder engine specs
| Version | Power | Torque | Displacement | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|
| 1.8 MT | 136 hp at 5,800 rpm | 180 Nm at 4,400 rpm | 1,781 cc | Gasoline | 4 | Inline | No | 5-speed Manual | RWD |
| 2.3 MT | 136 hp at 5,200 rpm | 200 Nm at 3,500 rpm | 2,298 cc | Gasoline | 4 | Inline | No | 5-speed Manual | RWD |
| 3.0 MT, 180 hp | 180 hp at 5,700 rpm | 255 Nm at 4,400 rpm | 2,960 cc | Gasoline | 6 | Inline | No | 5-speed Manual | RWD |
| 3.0 MT, 235 hp | 235 hp at 6,300 rpm | 272 Nm at 4,600 rpm | 2,960 cc | Gasoline | 6 | Inline | No | 5-speed Manual | RWD |
The 1.8 MT uses four valves per cylinder, an 8:1 compression ratio, and an 81 × 86.4 mm bore and stroke. It produces approximately 76.4 hp per litre, the highest specific output among the versions apart from the more powerful 3.0 MT.
The 2.3 MT uses two valves per cylinder, a 9.1:1 compression ratio, and a 95.5 × 80.2 mm bore and stroke. It matches the 1.8 MT at 136 hp but adds 20 Nm, an increase of about 11.1%. Its peak torque also arrives 900 rpm earlier. In exchange for those characteristics, its specific output is lower at approximately 59.2 hp per litre.
The 180 hp 3.0 MT uses six Inline cylinders, two valves per cylinder, a 9.2:1 compression ratio, and an 88.5 × 80.2 mm bore and stroke. Compared with the 2.3 MT, it adds 44 hp and 55 Nm. Its specific output is approximately 60.8 hp per litre.
The 235 hp 3.0 MT retains the 2,960 cc displacement and six-cylinder Inline layout but uses four valves per cylinder and a 10:1 compression ratio. Against the 180 hp 3.0 MT, it supplies 55 hp more and 17 Nm more without increasing displacement. Its specific output is approximately 79.4 hp per litre, the highest in the range.
Isdera Spyder performance and mpg
| Version | 0–100 km/h | Top speed | City consumption | Highway consumption | Combined consumption |
|---|---|---|---|---|---|
| 1.8 MT | not measured | not measured | not measured | not measured | not measured |
| 2.3 MT | not measured | not measured | not measured | not measured | not measured |
| 3.0 MT, 180 hp | not measured | not measured | not measured | not measured | not measured |
| 3.0 MT, 235 hp | 5.9 seconds | 262 km/h | not measured | not measured | not measured |
Only the 235 hp 3.0 MT has measured performance figures: 0–100 km/h takes 5.9 seconds and maximum speed is 262 km/h. Acceleration and top speed for the other three versions are not measured, so their performance should not be inferred from power alone.
Fuel consumption is not measured for any Isdera Spyder version. Consequently, no supported city, highway, combined, or mpg comparison can be made. CO₂ output and environmental class are also not measured across the range.
Isdera Spyder dimensions, weight, clearance, and tank capacity
Kerb weight is not measured for the 1.8 MT, 2.3 MT, or 180 hp 3.0 MT. Gross weight is likewise not measured for these versions. The 235 hp 3.0 MT has a measured kerb weight of 1,000 kg and gross weight of 1,200 kg.
For the 235 hp 3.0 MT, the resulting weight-to-power ratio is approximately 4.26 kg per hp. Because the other versions lack measured weights, equivalent ratios cannot be calculated reliably.
Every version has 135 mm of ground clearance and a 65-litre fuel tank. Wheel sizes are not measured for any version. Both front and rear suspension are Independent, spring across the range. Every version also has Ventilated disc front brakes and Disc rear brakes.
Which Isdera Spyder version should you buy?
Choose the 1.8 MT if specific output matters more than maximum torque. Its 136 hp equals the output of the larger 2.3 MT, while its approximately 76.4 hp per litre exceeds the 2.3 MT figure by about 17.2 hp per litre. It also combines four valves per cylinder with the smallest displacement in the catalogue. However, its 180 Nm is the lowest torque figure here, and measured acceleration, maximum speed, weight, and fuel consumption are unavailable.
Choose the 2.3 MT if you want the stronger of the two 136 hp alternatives on the available torque data. It produces 200 Nm, which is 20 Nm more than the 1.8 MT, and reaches that peak at 3,500 rpm rather than 4,400 rpm. Both versions use four Inline cylinders, Gasoline, no boost, a 5-speed Manual gearbox, and RWD. The available data therefore supports the 2.3 MT on torque, but not on acceleration or economy because those figures are not measured.
Choose the 180 hp 3.0 MT if you want the first six-cylinder step without selecting the highest-output specification. It gains 44 hp and 55 Nm over the 2.3 MT, reaching 180 hp and 255 Nm. Compared with the 1.8 MT, it adds the same 44 hp but gains 75 Nm. Its performance, consumption, and weight remain not measured, making it a specification-led choice rather than one supported by recorded road-performance figures.
Choose the 235 hp 3.0 MT if outright performance and the most complete specification record are the priorities. It offers 99 hp more than either 136 hp version and 55 hp more than the other 3.0 MT. Its 272 Nm output is 92 Nm above the 1.8 MT, 72 Nm above the 2.3 MT, and 17 Nm above the 180 hp 3.0 MT. It is also the only version backed by measured 0–100 km/h, top-speed, kerb-weight, and gross-weight data.
There is no catalogue evidence for Isdera Spyder price, current cars for sale, running costs, problems, or reliability differences. The data therefore cannot show what any extra purchase price buys. On specifications alone, the 2.3 MT is the torque-focused choice among the 136 hp cars, the 180 hp 3.0 MT is the intermediate six-cylinder option, and the 235 hp 3.0 MT is the strongest and best-documented performance choice.