| Date | Place |
Division |
Start |
Finish | Owner |
# |
Car | Laps | Money | Status | Laps Led |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar 22 1975 | Sebring International Raceway | IMSA GT | 40 | 18 | Bob Speakman | 84 | Datsun 240Z | 197 | running | ||
| Aug 24 1975 | Mid-Ohio Sports Car Course | IMSA GT | 31 | 14 | Datsun Z | 192 | running | ||||
| Feb 5 1978 | Daytona International Speedway | IMSA GT/World Sports Car Championship | 56 | 16 | Bondurant Racing School | 84 | Datsun 260Z | 577 | running | ||
| Mar 18 1978 | Sebring International Raceway | IMSA GT | 32 | 45 | Worldparts | 84 | Datsun 260Z | 98 | mechanical | ||
| Feb 4 1979 | Daytona International Speedway | IMSA GT/World Sports Car Championship | 47 | 22 | Drolsom Racing | 34 | Porsche 911 | 482 | running | ||
| Mar 17 1979 | Sebring International Raceway | IMSA GT | 65 | 52 | Drolsom Racing | 34 | Porsche 911 | 75 | transmission | ||
| Feb 2 1980 | Daytona International Speedway | IMSA Champion Spark Plug Challenge | 9 | Mazda RX-3 | 26 | running | |||||
| Aug 31 1980 | Road America | IMSA GT | 47 | 21 | Jack Dunham | 66 | Mazda RX-7 | 100 | running | ||
| Feb 1 1981 | Daytona International Speedway | IMSA GT/World Sports Car Championship | 43 | 66 | Richard J. Dunham | 66 | Mazda RX-7 | 20 | did not finish | ||
| Jan 31 1982 | Daytona International Speedway | IMSA GT | 36 | 14 | Downing/Atlanta | 63 | Mazda RX-7 | 590 | running | ||
| Mar 20 1982 | Sebring International Raceway | IMSA GT | 29 | 13 | Jim Downing | 63 | Mazda RX-7 | 209 | running | ||
| Apr 25 1982 | Riverside International Raceway | IMSA GT | 25 | 12 | Jim Downing | 63 | Mazda RX-7 | 171 | running | ||
| May 16 1982 | Charlotte Motor Speedway | IMSA GT | 23 | 8 | Jim Downing | 63 | Mazda RX-7 | 126 | running | ||
| Aug 15 1982 | Mosport International Raceway | IMSA GT | 20 | 11 | Jim Downing | 63 | Mazda RX-7 | 205 | running | ||
| Aug 22 1982 | Road America | IMSA GT | 28 | 29 | Jim Downing | 63 | Mazda RX-7 | 77 | did not finish | ||
| Sep 5 1982 | Mid-Ohio Sports Car Course | IMSA GT | 26 | 29 | Downing/Atlanta | 63 | Mazda RX-7 | 86 | did not finish | ||
| Sep 12 1982 | Road Atlanta | IMSA GT | 31 | 9 | Jim Downing | 63 | Mazda RX-7 | 115 | running | ||
| Sep 26 1982 | Pocono International Raceway | IMSA GT | 20 | 9 | Jim Downing | 63 | Mazda RX-7 | 160 | running | ||
| Nov 28 1982 | Daytona International Speedway | IMSA GT | 42 | 12 | Jim Downing | 63 | Mazda RX-7 | 78 | running | ||
| Feb 6 1983 | Daytona International Speedway | IMSA GT | 42 | 21 | RGP 500 Racing | 63 | Mazda RX-7 | 466 | running | ||
| Mar 19 1983 | Sebring International Raceway | IMSA GT | 47 | 18 | RGP 500 Racing | 63 | Mazda RX-7 | 204 | running | ||
| Apr 10 1983 | Road Atlanta | IMSA GT | 31 | 17 | RGP 500 Racing | 63 | Mazda RX-7 | 112 | running | ||
| May 15 1983 | Charlotte Motor Speedway | IMSA GT | 25 | 10 | RGP 500 Racing | 63 | Mazda RX-7 | 130 | running | ||
| May 30 1983 | Lime Rock Park | IMSA GT | 28 | 8 | RGP 500 Racing | 63 | Mazda RX-7 | 163 | running | ||
| Jun 19 1983 | Mid-Ohio Sports Car Course | IMSA GT | 25 | 7 | RGP 500 Racing | 63 | Mazda RX-7 | 194 | running | ||
| Jul 10 1983 | Brainerd International Raceway | IMSA GT | 17 | 8 | RGP 500 Racing | 63 | Mazda RX-7 | 95 | 900 | running | |
| Jul 24 1983 | Sears Point International Raceway | IMSA GT | 19 | 12 | RGP 500 Racing | 63 | Mazda RX-7 | 97 | running | ||
| Jul 31 1983 | Portland International Raceway | IMSA GT | 22 | 10 | RGP 500 Racing | 63 | Mazda RX-7 | 135 | running | ||
| Aug 14 1983 | Mosport International Raceway | IMSA GT | 19 | 6 | RGP 500 Racing | 63 | Mazda RX-7 | 204 | running | ||
| Aug 21 1983 | Road America | IMSA GT | 23 | 7 | RGP 500 Racing | 63 | Mazda RX-7 | 107 | running | ||
| Sep 11 1983 | Pocono International Raceway | IMSA GT | 19 | 6 | RGP 500 Racing | 63 | Mazda RX-7 | 163 | running | ||
| Nov 27 1983 | Daytona International Speedway | IMSA GT | 34 | 51 | RGP 500 Racing | 63 | Mazda RX-7 | 40 | did not finish | ||
| Feb 5 1984 | Daytona International Speedway | IMSA GT | 29 | 9 | RGP 500 Racing | 63 | Argo JM16 098/Mazda | 579 | running | ||
| Feb 26 1984 | Bicentennial Park | IMSA GTP | 23 | 26 | RGP 500 Racing | 63 | Argo JM16/Mazda | 24 | fire | ||
| Mar 24 1984 | Sebring International Raceway | IMSA GT | 22 | 74 | RGP 500 Racing | 63 | Argo JM16 098/Mazda | 17 | spin | ||
| Apr 8 1984 | Road Atlanta | IMSA GT | 18 | 9 | RGP 500 Racing | 63 | Argo JM16 098/Mazda | 115 | running | ||
| Apr 29 1984 | Riverside International Raceway | IMSA GT | 21 | 10 | RGP 500 Racing | 63 | Argo JM16 Mazda | 181 | running | ||
| May 20 1984 | Charlotte Motor Speedway | IMSA GT | 19 | 8 | RGP 500 Racing | 63 | Argo JM16 Mazda | 127 | running | ||
| Jun 10 1984 | Mid-Ohio Sports Car Course | IMSA GT | 16 | 7 | RGP 500 Racing | 63 | Argo JM16 Mazda | 119 | running | ||
| Jul 8 1984 | Watkins Glen International | IMSA GT | 21 | 4 | RGP 500 Racing | 63 | Argo JM16 Mazda | 181 | running | ||
| Jul 28 1984 | Portland International Raceway | IMSA GT | 18 | 25 | RGP 500 Racing | 63 | Argo JM16 Mazda | 91 | running | ||
| Aug 26 1984 | Road America | IMSA GT | 19 | 9 | RGP 500 Racing | 63 | Argo JM16 Mazda | 113 | 1,700 | running | |
| Sep 9 1984 | Pocono International Raceway | IMSA GT | 16 | 8 | RGP 500 Racing | 63 | Argo JM16 Mazda | 101 | running | ||
| Sep 16 1984 | Michigan International Speedway | IMSA GTP/GTO | 23 | 27 | RGP 500 Racing | 63 | Argo JM16 Mazda | 33 | did not finish | ||
| Sep 30 1984 | Watkins Glen International | IMSA GT | 16 | 5 | RGP 500 Racing | 63 | Argo JM16 Mazda | 89 | running | ||
| Feb 3 1985 | Daytona International Speedway | IMSA GT | 74 | 13 | RGP 500 Racing | 63 | Argo JM16 097/Mazda | 599 | running | ||
| Feb 24 1985 | Bicentennial Park | IMSA GTP/Lights | 32 | 17 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 99 | running | ||
| Mar 23 1985 | Sebring International Raceway | IMSA GT | 18 | 5 | Jim Downing | 63 | Argo JM16B 097/Mazda | 253 | running | ||
| Apr 14 1985 | Road Atlanta | IMSA GT | 21 | 28 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 93 | running | ||
| Apr 28 1985 | Riverside International Raceway | IMSA GT | 25 | 7 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 106 | running | ||
| May 19 1985 | Charlotte Motor Speedway | IMSA GTP/Lights | 15 | 5 | RGP 500 Disk Brake | 63 | Argo JM16B 097/Mazda | 131 | 5,500 | running | |
| Jun 9 1985 | Mid-Ohio Sports Car Course | IMSA GTP/Lights | 20 | 9 | RGP 500 Dick Brake | 63 | Argo JM16B 097/Mazda | 119 | running | ||
| Jul 7 1985 | Watkins Glen International | IMSA GTP/Lights | 13 | 11 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 90 | running | ||
| Aug 25 1985 | Road America | IMSA GT | 30 | 10 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 112 | 4,100 | running | |
| Sep 8 1985 | Pocono International Raceway | IMSA GT | 18 | 33 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 42 | did not finish | ||
| Sep 29 1985 | Watkins Glen International | IMSA GT | 24 | 10 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 83 | 5,600 | running | |
| Oct 6 1985 | Columbus Street Circuit | IMSA GTP/Lights | 20 | 6 | RGP 500 Racing | 63 | Argo JM16B 097/Mazda | 123 | running | ||
| Dec 1 1985 | Daytona International Speedway | IMSA GT | 27 | 13 | Jim Downing | 63 | Argo JM19 107/Mazda | 82 | running | ||
| Feb 2 1986 | Daytona International Speedway | IMSA GT | 69 | 45 | Certified Brakes | 63 | Argo JM19 107/Mazda | 184 | electrical | ||
| Mar 22 1986 | Sebring International Raceway | IMSA GT | 18 | 9 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 238 | running | ||
| Apr 6 1986 | Road Atlanta | IMSA GTP/Lights | 17 | 9 | Certified Brakes Racing | 63 | Argo JM16 107/Mazda | 112 | running | ||
| Apr 27 1986 | Riverside International Raceway | IMSA GT | 28 | 9 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 163 | 7,500 | running | |
| May 18 1986 | Charlotte Motor Speedway | IMSA GTP/Lights | 12 | 15 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 53 | 1,550 | did not finish | |
| Jun 8 1986 | Mid-Ohio Sports Car Course | IMSA GTP/Lights | 17 | 12 | Certified Brakes | 63 | Argo JM19 107/Mazda | 118 | running | 0 | |
| Jul 6 1986 | Watkins Glen International | IMSA GT | 21 | 16 | Certified Brakes | 63 | Argo JM19 107/Mazda | 131 | running | ||
| Aug 24 1986 | Road America | IMSA GT | 32 | 9 | Certified Brakes | 63 | Argo JM19 107/Mazda | 113 | 3,450 | running | |
| Sep 21 1986 | Watkins Glen International | IMSA GTP/Lights | 18 | 11 | Certified Brakes | 63 | Argo JM19 107/Mazda | 83 | running | ||
| Oct 5 1986 | Columbus Street Circuit | IMSA GTP/Lights | 32 | 22 | Certified Brakes | 63 | Argo JM19 107/Mazda | 76 | did not finish | ||
| Oct 26 1986 | Daytona International Speedway | IMSA GTP/GTO/Lights | 41 | 18 | Certified Brakes | 63 | Argo JM19 107/Mazda | 84 | running | ||
| Feb 1 1987 | Daytona International Speedway | IMSA GT | 30 | 37 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 352 | engine | ||
| Mar 1 1987 | Bicentennial Park | IMSA GTP/Lights | 23 | 13 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 120 | 5,000 | running | |
| Mar 21 1987 | Sebring International Raceway | IMSA GT | 21 | 14 | Jim Downing | 63 | Argo JM19 107/Mazda | 253 | 5,000 | running | |
| Apr 12 1987 | Road Atlanta | IMSA GTP/Lights | 16 | 7 | Certified Brakes | 63 | Argo JM19 107/Mazda | 111 | 9,500 | running | |
| Apr 26 1987 | Riverside International Raceway | IMSA GTP/Lights | 15 | 8 | Certified Brakes | 63 | Argo JM19 107/Mazda | 113 | 7,000 | running | |
| Jun 7 1987 | Mid-Ohio Sports Car Course | IMSA GTP/Lights | 14 | 9 | Certified Brakes | 63 | Argo JM19 107/Mazda | 117 | 5,750 | running | |
| Jun 21 1987 | West Palm Beach Street Circuit | IMSA GTP/Lights | 7 | 8 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 139 | 6,250 | running | |
| Jul 5 1987 | Watkins Glen International | IMSA GTP/Lights | 14 | 4 | Certified Brakes | 63 | Argo JM19 107/Mazda | 121 | 11,800 | running | |
| Aug 16 1987 | Road America | IMSA GT | 33 | 12 | Certified Brakes | 63 | Argo JM19 Mazda | 73 | 5,750 | running | |
| Sep 6 1987 | San Antonio Street Course | IMSA GTP/Lights | 15 | 8 | Certified Brakes Racing | 63 | Argo JM19 107/Mazda | 111 | 6,200 | running | |
| Oct 25 1987 | Del Mar Speedway | IMSA GTP/Lights | 21 | 9 | Certified Brakes | 63 | Argo JM19 107/Mazda | 88 | 6,500 | running | |
| Apr 10 1988 | Road Atlanta | IMSA GTP/Lights | 27 | 13 | Downing/Atlanta | 70 | Argo JM16 Mazda | 109 | running | ||
| Feb 5 1989 | Daytona International Speedway | IMSA GT | 29 | 30 | Mazda | 63 | Argo JM19 107/Mazda | 412 | engine | ||
| Feb 4 1996 | Daytona International Speedway | IMSA GT | 54 | 25 | Tim Vargo | 68 | Porsche 911 Cup | 526 | 1,500 | running | |
| Feb 4 1996 | Daytona International Speedway | IMSA GT | 57 | 68 | Tim Vargo | 27 | Porsche 993 Carrera RS | 75 | 0 | did not finish |