There is no independently verified record in the sources reviewed showing that the Weber Faster One reached 400 km/h or became the world’s fastest street-legal sports car. Weber promoted it as a car capable of more than 400 km/h, and the German Aerospace Center (DLR) later cited 420 km/h while crediting Weber. Neither source documents a measured run. The distinction is crucial: the Faster One’s headline speed is a claim, not an established record.
What top speed did Weber claim for the Faster One?
Weber Sportcars’ overview describes the Faster One as a two-seat, mid-engine car weighing 1,250 kg, with a 1,200 hp V10 and a claimed top speed above 400 km/h. Weber also gives acceleration figures of about 2.5 seconds from 0 to 100 km/h and 16.2 seconds from 0 to 300 km/h. These are manufacturer-published figures, not results from a test protocol or independent measurement in the cited material. Weber’s Faster One overview.
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Weber’s technical specifications give a 5,600 cm³ engine, 1,200 PS at 7,000 rpm, 1,250 Nm at 4,200 rpm, all-wheel drive and a six-speed sequential gearbox. That page lists 0–200 km/h in 6.6 seconds and again states a maximum speed above 400 km/h. The overview’s 1,200 hp and the technical sheet’s 1,200 PS are the wording and units used on those pages; they should not be treated as a single independently verified measurement.
Is the 420 km/h figure a verified run?
No test evidence accompanies the 420 km/h figure in the cited DLR explainer. DLR calls the Faster One the fastest car allowed on normal roads and says, “Die Spitzengeschwindigkeit liegt bei 420 Stundenkilometern!” (“The top speed is 420 kilometers per hour!”), while crediting Weber Sportcars. The page does not identify a test venue, timing method, or independent verification. It also describes the car as having nearly 1,000 PS, unlike Weber’s later 1,200 hp/PS descriptions. The 420 km/h number should therefore be attributed to DLR’s account of Weber’s claim, not presented as a measured result. DLR_next’s Faster One explainer.
The FIA list of Category A homologated world speed records is an official record reference, but the materials reviewed do not establish a Faster One entry or validate a run by the car. That does not show that the FIA rejected or disproved Weber’s claim; it means a verified Faster One record is not established by the available evidence cited here.
What did Weber say was under the bodywork?
The car’s published specification and design details help explain why the claim attracted attention, but they do not verify its speed. Weber’s overview calls the engine a V10 with two superchargers; its technical sheet instead lists two turbochargers. The sources therefore disagree on the forced-induction terminology, and the system should not be described as settled without qualification.
Weber also describes paddle shifting and an all-wheel-drive system that can send up to 36 percent of power to the front axle. The specifications list a carbon monocoque with an integrated safety cell, ceramic brake discs and Pirelli high-performance tires. These are the manufacturer’s published design details, not independent inspection or test findings. Weber’s drivetrain description.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Was the Faster One built and delivered to customers?
A March 2013 Sport Auto report said the manufacturer had confirmed production. It also described a project first shown in images in 2008, represented by digital images and a specification sheet, with a limited number of examples planned. The report does not establish a completed customer car, deliveries, or a production total. A production announcement alone is not proof that cars reached customers, and the cited sources do not establish current road-registration status.
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A useful comparison separates manufacturer claims from independently measured performance and asks whether production, road approval and the number of completed cars are documented. A headline speed alone cannot answer whether two cars achieved comparable results.
| Comparison point | Weber Faster One | Koenigsegg One:1 |
|---|---|---|
| Power and weight | Weber states 1,200 hp and 1,250 kg in its overview; these are manufacturer-published figures. Weber | Koenigsegg states 1 MW and 1,360 kg on its model page; these are manufacturer-published figures. Koenigsegg |
| Top speed | Above 400 km/h claimed by Weber; DLR cites 420 km/h while crediting Weber. No independently documented Faster One speed-test protocol or result is established in the sources cited here. | Not stated on the cited model page. |
| Production evidence | A 2013 report described production as confirmed and a limited number planned; completed cars, deliveries and totals are not established by that report. | Koenigsegg says seven examples were built between 2014 and 2015. |
| Independent measured result in the cited material | Not established. | Not stated on the cited model page. |
The One:1 provides a manufacturer-documented production comparison, not proof that the Faster One reached its claimed speed. A fair record comparison would need like-for-like evidence: a defined road-legal configuration, a stated measurement method, independently documented timing and clear production or homologation status.
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