by Martini after Guy Ligier acquired the company in 2005, was used in selected rounds by Nico Hülkenberg, driving for Josef Kaufmann Racing. The engine supply market in the Formel 3 Cup is just as open. The H.W.A.-Mercedes and Spiess-Opel are the most popular, but some teams use the Mugen-Honda, TOM's-Toyota and even the older Sodemo-Renault. This is in stark contrast to the Euroseries, in which Mercedes powered all bar five of the 2006 entrants. However, the 2007 Formel 3 Cup season is likely to see a different pattern emerge, with the introduction of a new "Challenge" engine, which is expected to be chosen by a number of teams in both the Championship class and the Trophy class. It is being built by Spiess and is based on the company's Opel engine, but with some technical changes to lengthen the service interval and reduce running costs. Specifications Engine: piston engines, maximum four cylinders, 26mm-diameter air restrictor Capacity: maximum 2,000cc Tyres: Yokohama, dimensions: 200/50VR13 front, 240/45VR13 rear Tyre limitation: 2 sets of slicks per weekend, unlimited number of wet-weather tyres Restriction: thermal, chemical or mechanical treatments are prohibited Wheels:ATS alloy wheel front 9x13, rear 10.5x13 Minimum weight: 550 kg, car including all fluids and the driver Fuel: Control fuel, unleaded Shell Super plus Restriction: no refuelling during practice, qualifying and race Monocoque: Carbon fibre sandwich design, two roll-over structures, stepped underbody Restriction: Monocoque must not be changed during an event Telemetry: Prohibited Data recording: Allowed ABS: Prohibited Gearbox: Maximum 6-speed gearbox, sequential Catalyst: Silencer and catalyst Source: See also German Formula Three Championship drivers List of German Formula Three champions ADAC Formel Masters Formula 3 Euro Series References External links Official website Speedsport Magazine – results and data German Formula 3 Championship at forix.com Formula Three series Recurring sporting events established in 1950 Recurring sporting events disestablished in 2014 Defunct auto racing series 1950 establishments in Germany 2014 disestablishments in Germany Defunct sports competitions in Germany