The following are known Action Replay Codes for Ridge Racer 64 on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Enable All Cars
8102f19cffff
8102f19effff

Infinite Time
811269ca0700

Always Place 1st
810564440001

All Tracks And All Trophies
81043530ffff
81043532ffff
81043534ffff
81043536ffff

Press R Button for Turbo
d103e1ea0010
8105641a0800