Here is a patch which converts the mapper in Rad Racer from MMC1 to MMC3.
Rad Racer (USA).nes - NOINTRO
CRC32: 595DAA35
MD5: 1F0014742B957F323599F5109F7FAD73
SHA-1: 97F4195A0113CAA268CE4F8729DFB719C6D6D460
SHA-256: 2A871D3205D176C810D57F8B3EAB65842F53F73C296C57D010FD591A3A25AB58