The EFDA Nations Cup, was a Country vs Country competition for Formula Opel cars between 1990 and 1998. It had always been Dan Partel's dream to stage a race that pitted drivers in equal cars racing for their country. The Formula Opel/Vauxhall one make racing series offered the best opportunity for such an event.
The 1990 EFDA Nations Cup (Nation Cup I) was held at Spa-Francorchamps, Belgium (19–20 July 1990).
| Position | Country | Driver 1 | Driver 2 | |
|---|---|---|---|---|
| 1 |  Portugal | Pedro Lamy | Diogo Castro Santos | |
| 2 |  Brazil | Rubens Barrichello | André Ribeiro | |
| 3 |  Sweden | Michael Johansson | Johan Rajamaki | |
| 4 |  Italy | Vincenzo Sospiri | Alberto Trezzi | |
| 5 | Michael Krumm | Joachim Beule | ||
| 6 |  Switzerland | Cedric Reynard | Peter Honegger | |
| 7 |  Argentina | Jose Luis Di Palma | Patricio van Cayzeele | |
| 8 |  Belgium | Didier Defourny | Alain Plasch | |
| 9 | David Coulthard | Nicky Hart | ||
| 10 |  France | Gil de Ferran | Olivier Hulot | |
| 11 |  Denmark | Henrik Larsen | Erik Madsen | |
| 12 |  United States | Dennis Vitolo | Nick Firestone | |
| 13 |  Finland | Marko Mankonen | Hannu Rinne-Laturi | |
| 14 |  Netherlands | Allard Kalff | Marcel Albers | |
| 15 |  Norway | Torben Kvia | Kjetil Greve | |
| 16 | Steffan Goepel | Ralf Ahlert | ||
| 17 |  Austria | Helmut Kopp | Philipp Peter |