 For the 1992 running of Daytona, the R90CKs would have their VRH35Z engines replaced with smaller 3.0L twin-turbo V8s, although they would not be as successful as the race winning R91CP.Three other unique R90Cs were cars that were based on existing cars but modified.One R89C was upgraded to become an R90CP, originally used by Nissan in the JSPC before all cars were completed.