Siegfried Spiess Motorenbau GmbH is a family-run company that develops, manufactures and services its own high-performance engines in second generation.
Siegfried Spiess had direct contact with engines and vehicles since his childhood, as his parents ran an NSU and Mercedes workshop in Stuttgart Weilimdorf.
Siegfried Spiess tuned NSU engines into excellent power units that were used worldwide with great success.
On behalf of NSU, Siegfried Spiess not only tuned the engines but also built the entire vehicles.
In 1983 and 1984, the team finished as runners-up and in 1985, Volker Weidler won the first German Formula 3 title with an engine modified by Spiess.
In Japan, Great Britain, France, Italy, Sweden, Norway, Switzerland, etc., Opel-Spiess engines were used in various racing series and won championships with them.
It is worth mentioning that the VW successes also brought Opel onto the scene and that it was an absolute novelty and an extreme sign of confidence that a tuner was responsible for two competing products.
In 2000, Siegfried Spiess GmbH developed and manufactured a 4-litre V8 engine for the Opel Astra V8 Coupé for the German Touring Car Championship.
As the workshop at the former location in Ditzingen became too small, Spiess Tuning moved to a specially designed new building in 2001.
In the new 2,400 sqm halls, the four new test benches (three static, one dynamic) formed important elements for the ongoing success in racing.
In the same year, Siegried Spiess GmbH extended its business activities to prototyping and testing of high-performance derivatives.
In cooperation with VW, the first diesel engine for long-distance rally events was developed and manufactured by Spiess.
The first Dakar championship title for VW and Spiess followed in 2009 with Giniel de Villiers and Dirk von Zitzewitz at the wheel.
At the Macau Grand Prix, Dan Ticktum finished first with a VW Spiess engine.
Also in Japan, Sacha Fenestraz won the overall Superformula Lights classification with Spiess Power in the same year.
In 2021, Erwin Buck became KW-Bergcup winner and vice mountain champion with Spiess SP G02 (2.0 L) engine.
With Spiess A41 engines, Cameron Das won the Euroformula Open and Teppei Natori the Superformula Lights.