| 20.4.1958 | Trofeo Nuvolari Montjuich | | | Salvado | | 7th |
| 27.4.1958 | SCCA Regional Lime Rock [GP+HM+Sedan] | 18 | 93 GT | Marvin Tober | | 12th |
| 27.4.1958 | SCCA Regional Lime Rock [GP+HM+Sedan] | 79 | | John Plaisted | | DNA |
| 10.5.1958 | 4 h Relay Harewood Acres | 16A | 93 B | Horner Trotter | Ecurie Saab | 1st |
| 10.5.1958 | 4 h Relay Harewood Acres | 16B | 93 B | Beattie MacKenzie | Ecurie Saab | 1st |
| 25.5.1958 | GP des Frontières [GT2.0+TS1.0] | | 93 GT 750 | Georges Hacquin | | 6th |
| 31.5.1958 | Novice Dunkirk [FP+GP+IP+KP] | 83 | | Fred Haller | | 14th |
| 7.6.1958 | Put-In-Bay [GM+HM+IP] | 51 | | Willis Grant | | DNA |
| 8.6.1958 | SCCA Regional Thompson [FP+GP+HM+Sedan] | 79 | 93 GT | John Plaisted | | 13th |
| 27.6.1958 | SCCA Regional Watkins Glen [FP+GP+Sedan] | 105 | | Dean McCarthy | Dean McCarthy | DNA |
| 5.7.1958 | LASC Green Acres [S1.5] | 20 | | Les Rutledge | Les Rutledge | 19th |
| 5.7.1958 | LASC Green Acres [S1.5] | 109 | | Horner Trotter | | 15th |
| 5.7.1958 | LASC Green Acres [Trophy] | 109 | | Horner Trotter | | 11th |
| 16.8.1958 | Harewood Acres [FP+GP+MG] | 24 | | Les Rutledge | Les Rutledge | DNA |
| 16.8.1958 | Harewood Acres [Le Mans] | 24 | | Les Rutledge | Les Rutledge | DNA |
| 16.8.1958 | Preliminary Montgomery [GT] | 109 | 93 GT | John Plaisted | | 10th |
| 16.8.1958 | Preliminary Montgomery [GT] | 179 | 93 GT | Dean McCarthy | | 9th |
| 16.8.1958 | Preliminary Montgomery [GT] | 229 | 93 GT | Raymond DuBois | | 11th |
| 16.8.1958 | Harewood Acres [FP+GP+MG] | | Sedan | Horner Trotter | | 2nd |
| 16.8.1958 | Harewood Acres [Le Mans] | | | Horner Trotter | | ?th |
| 31.8.1958 | Preliminary Thompson [GP+HP+HM] | 42 | 93 GT | Dean McCarthy | | 12th |
| 13.9.1958 | Preliminary Bridgehampton [GT] | 5 | 93 GT | Dean McCarthy | | 8th |
| 13.9.1958 | Preliminary Bridgehampton [GP+HP+HM] | 42 | 93 GT | Raymond DuBois | | 12th |
| 13.9.1958 | Preliminary Bridgehampton [GT] | 42 | 93 GT | Raymond DuBois | | 10th |
| 14.9.1958 | Preliminary Bridgehampton [Handicap] | 5 | 93 GT | Dean McCarthy | | 12th |
| 20.9.1958 | SCCA National Watkins Glen [FM+GM+HM] | 154 | 93 GT | Raymond DuBois | | 17th |
| 20.9.1958 | SCCA National Watkins Glen [FM+GM+HM] | 155 | 93 GT | Dean McCarthy | | DNF |
| 21.9.1958 | Del Mar [Ladies+Sedan] | | | John Halliwell | | ?th |
| 21.9.1958 | Del Mar [Ladies+Sedan] | | | Ingvar Lindquist | | ?th |
| 28.9.1958 | Hourglass Field [Sedan+MG] | | | Ingvar Lindquist | | 2nd |
| 5.10.1958 | SCCA Regional Thompson [GP+HP] | 84 | 93 GT | John Plaisted | | 15th |
| 12.10.1958 | SCCA Regional Wilmot [GP+HP+IM+Sedan] | 77 | | Elvin Bollet | | 2nd |
| 18.10.1958 | Preliminary Lime Rock [GT] | 69 | 93 GT | Dick Malone | | ?th |
| 18.10.1958 | Preliminary Lime Rock [GT] | 105 | 93 GT | Mitchie Warner | | ?th |
| 19.10.1958 | SCCA Regional Lime Rock [GP+HP+HM] | 110 | 93 GT | John Plaisted | | 4th |
| 1.11.1958 | Preliminary Palm Springs [Novice+Sedan] | 12 | | John Halliwell | John Halliwell | DNA |
| 1.11.1958 | Preliminary Palm Springs [Novice+Sedan] | 21 | | Ingvar Lindquist | Ingvar Lindquist | DNA |
| 2.11.1958 | Palm Springs [Ladies+Sedan+FIII] | 12 | | John Halliwell | John Halliwell | DNA |
| 2.11.1958 | Palm Springs [Ladies+Sedan+FIII] | 21 | | Ingvar Lindquist | Ingvar Lindquist | DNA |
| 15.11.1958 | 9 h Johannesburg | 30 | 93 | Frisby / Langmuss | Truxk & Car (Vereeniging) Ltd. | 16th |
| 16.11.1958 | SCCA Regional Marlboro [EP+FP+GP+HP+HM+FIII] | 61 | 93 GT | Jack Davis | | 20th |
| 16.11.1958 | Preliminary Marlboro [FP+GP] | 61 | | Jack Davis | | 10th |
| 16.11.1958 | Preliminary Marlboro [FP+GP] | 66 | | J. Hriunak | | 14th |
| 16.11.1958 | Preliminary Marlboro [FP+GP] | 118 | | Ben Moore | | 12th |
| 16.11.1958 | SCCA Regional Marlboro [EP+FP+GP+HP+HM+FIII] | 118 | | Ben Moore | | 19th |
| 22.11.1958 | 6 h Pomona | | | Lindquist / Verrecchia | | 20th |