Interserie
Keimola was host to a round of the European prototype series Interserie between 1970 and 1972 after a grid of three cars participated in a round of the Nordic Challenge Cup in 1969. Finnish driver Leo Kinnunen from AAW Racing Team drove three full seasons between 1971–1973 and won the championship in every year, which increased interest into the series. The track record is also hold by Kinnunen who drove it in 1972 Interserie race with Porsche 917/10 TC. The lap time was 1:11.74 with an average speed of 165.4 km/h (102.8 mph).
- Winners of Keimola Interserie races
| Year | Winner | Car | Laps | Time |
|---|---|---|---|---|
| 1969 | Jochen Rindt | Porsche 908 | ||
| 1970 | Gijs van Lennep | Porsche 917 | 50 | 1:04:27.750 |
| 1971 | Leo Kinnunen | Porsche 917 | 70 | 1:26:07.190 |
| 1972 | Leo Kinnunen | Porsche 917 | 70 | 1:34:23.350 |
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