Wiesmann GT: which 4.4 AT to buy — 407 hp or 555 hp
The Wiesmann GT was sold as one generation (2003–2013) in a Coupe body with two versions that share the same catalogue name 4.4 AT. They are not the same car. One 4.4 AT is 407 hp; the other 4.4 AT is 555 hp. Both use a 4395 cm³ Gasoline V-shaped 8-cylinder Turbo engine, a 6-speed Automatic gearbox, and RWD.
The Wiesmann GT was sold as one generation (2003–2013) in a Coupe body with two versions that share the same catalogue name 4.4 AT. They are not the same car. One 4.4 AT is 407 hp; the other 4.4 AT is 555 hp. Both use a 4395 cm³ Gasoline V-shaped 8-cylinder Turbo engine, a 6-speed Automatic gearbox, and RWD. The buying decision is which power figure you want, because every other measured difference is a consequence of that split.
There is no second generation and no restyling recorded as a separate generation. If you are choosing “which GT,” you are choosing between these two 4.4 AT rows, not between years of a facelift.
Which version to buy
Buy the 407 hp 4.4 AT if you want the lighter kerb weight (1390 kg), the lower combined consumption (12.3 vs 12.9), and a torque band that is measured as a range (600 Nm from 1750–4500 rpm) rather than a single point. You give up 148 hp, 80 Nm, 0.7 s on 0–100, and 20 km/h of top speed.
Buy the 555 hp 4.4 AT if the point of the GT is the power-to-weight number. At 1405 kg it is only 15 kg heavier than the 407 hp 4.4 AT, so you pay 15 kg for 148 hp. Weight per horsepower falls from 3.42 kg/hp (1390 ÷ 407) to 2.53 kg/hp (1405 ÷ 555). Power per litre rises from 92.6 hp/l (407 ÷ 4.395) to 126.3 hp/l (555 ÷ 4.395). 0–100 is 3.9 s versus 4.6 s; top speed is 311 km/h versus 291 km/h.
Both versions are listed for the full 2003-01-01 to 2013-12-31 window. Production years do not separate them. Ground clearance is 110 mm on both. Gearbox, drive, cylinder count, layout label, boost, fuel type, and injection type are the same English labels: Automatic, RWD, 8, V-shaped, Turbo, Gasoline, Distributed injection (multi-point), fuel 98.
“Extra money” is not in this dataset. What the stronger 4.4 AT buys in measured numbers is +148 hp, +109 kW (408 vs 299), +80 Nm, −0.7 s to 100 km/h, +20 km/h top speed, −1.4 city consumption (15.8 vs 17.2), −1.5 highway (7.9 vs 9.4), +0.6 combined (12.9 vs 12.3), and +15 kg kerb weight.
Specs comparison: both 4.4 AT versions
| Version | hp | kW | rpm (power) | Nm | rpm (torque) | cm³ | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4.4 AT (407 hp) | 407 | 299 | 5500 | 600 | 1750–4500 | 4395 | Gasoline | 8 | V-shaped | Turbo | Automatic 6 | RWD |
| 4.4 AT (555 hp) | 555 | 408 | 6000 | 680 | 1750 | 4395 | Gasoline | 8 | V-shaped | Turbo | Automatic 6 | RWD |
Displacement is identical: 4395 cm³ on both 4.4 AT versions. The 555 hp 4.4 AT makes 148 hp more from the same cubic centimetres. Peak power is taken 500 rpm higher (6000 vs 5500). Peak torque on the 407 hp 4.4 AT is held from 1750 to 4500 rpm; on the 555 hp 4.4 AT torque is listed at 1750 rpm only — the upper bound of that plateau is not measured for the stronger row.
Valves per cylinder: 4 on both. Compression ratio: 10 on the 407 hp 4.4 AT; not measured on the 555 hp 4.4 AT. Bore × stroke: 88.3 × 89 on the 407 hp 4.4 AT; not measured on the 555 hp 4.4 AT. Engine location: not measured on the 407 hp 4.4 AT; Front, longitudinal on the 555 hp 4.4 AT.
Engine: same 4395, two outputs
The 407 hp 4.4 AT is 299 kW at 5500 rpm with 600 Nm. Torque per litre is 136.5 Nm/l (600 ÷ 4.395). Specific output is 92.6 hp/l.
The 555 hp 4.4 AT is 408 kW at 6000 rpm with 680 Nm. Torque per litre is 154.7 Nm/l (680 ÷ 4.395). Specific output is 126.3 hp/l — 33.7 hp/l more than the 407 hp 4.4 AT (126.3 − 92.6).
Do not invent a third engine family. The catalogue has two modifications, both named 4.4 AT, both Gasoline, both Turbo, both 8 cylinders V-shaped, both Distributed injection (multi-point), both 98. The split is output, not a different displacement name.
Performance: 0–100 and top speed
The 407 hp 4.4 AT reaches 100 km/h in 4.6 s and is limited in the data to 291 km/h.
The 555 hp 4.4 AT reaches 100 km/h in 3.9 s and 311 km/h.
That is 0.7 s and 20 km/h. Relative to the 407 hp 4.4 AT, the 555 hp 4.4 AT is 15.2% quicker to 100 (0.7 ÷ 4.6) and 6.9% faster at the top (20 ÷ 291). Power is 36.4% higher (148 ÷ 407) while kerb mass is only 1.1% higher (15 ÷ 1390). The performance gap is mostly power, not a large weight cut.
MPG / fuel consumption (l/100 km)
Figures in the data are l/100 km, not US mpg. Tank size is not measured on either 4.4 AT. CO2 is not measured. Eco class is not measured.
City: 17.2 for the 407 hp 4.4 AT, 15.8 for the 555 hp 4.4 AT (1.4 lower on the stronger car).
Highway: 9.4 vs 7.9 (1.5 lower on the 555 hp 4.4 AT).
Combined: 12.3 vs 12.9 (0.6 higher on the 555 hp 4.4 AT).
The stronger 4.4 AT uses less fuel in the city and highway columns and more in the combined column. That contradiction is in the data; it is not resolved here. If you rank by combined only, the 407 hp 4.4 AT is the lower-use row. If you rank by city or highway as listed, the 555 hp 4.4 AT is the lower-use row.
Dimensions and weight
Kerb weight: 1390 kg (407 hp 4.4 AT), 1405 kg (555 hp 4.4 AT). Gross weight: not measured on either. Ground clearance: 110 mm on both. Tank: not measured. Wheel sizes: not measured.
Front suspension: Independent, spring on both. Rear suspension: Independent, spring on both. Front brakes: Ventilated disc on both. Rear brakes: Disc on both (label as in the data).
There is no length, width, height, wheelbase, or luggage figure in the source. Those are not measured.
Weight per horsepower is the useful chassis number you do have: 3.42 kg/hp on the 407 hp 4.4 AT versus 2.53 kg/hp on the 555 hp 4.4 AT. The 555 hp car carries 0.89 kg less per horsepower. Clearance does not change with power (110 mm both), so the “lower, more aggressive” story is not supported by a measured ride-height difference.
Reliability and problems
This dataset has no failure rates, recalls, or service intervals. Reliability and typical problems are not measured. What you can say from the table is mechanical sameness on paper: same Coupe generation, same 4395 Gasoline Turbo 8 V-shaped, same Automatic 6, same RWD, same Independent, spring axles, same brake types, same 98 fuel. Differences that could matter in use and that are measured: 148 hp, 80 Nm, 15 kg, different power rpm (5500 vs 6000), torque listed as a band versus a point, compression and bore × stroke present only on the 407 hp 4.4 AT, engine location present only on the 555 hp 4.4 AT (Front, longitudinal).
Generation vs generation
There is one generation (kluch 6210 in the source), 2003–2013, Coupe, two modifications. Nothing in the data shows a later generation that changed body type, drive, or gearbox. You cannot pick “the last GT generation” as a different car; you pick which 4.4 AT power.
Decision in one line
If the numbers that matter to you are 3.9 s, 311 km/h, 555 hp, 680 Nm, and 2.53 kg/hp, the 555 hp 4.4 AT is the version. If the numbers that matter are 1390 kg, 12.3 combined, a 600 Nm plateau to 4500 rpm, and a measured compression of 10 with bore × stroke 88.3 × 89, the 407 hp 4.4 AT is the version. Same name, same years, same Coupe, same 4395 — choose by 407 vs 555.