PORSCHE RACING HISTORYPorsche 935 - Chassis No. 009 00030
Also known as the 'old Warhorse' raced in IMSA and World Championship events from 1979-1987 1979 - Dick Barbour - Rebuilt from 930 890 0033 which was destroyed in an accident at the 1978 Le Mans 24 Hours 1980 - Bob Garretson - Converted to K3 after Daytona 24 Hours 1983 - Wayne Baker - Converted to 934 GTO specification, converted back to 935 at the end of the season 1985 - Chester Vincentz - Converted to 934 specification 1990’s - Carlos DeQuesada ? - Carlos Monteverde 2016 - Sold at Pebble Beach auction for $4,840,000 to Adam Carolla, a Hollywood film maker, producer and radio personality
10 June 1979 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 70 | Porsche 935 | 009 00030 | IMSA+2.5 | Rolf Stommelen (D)/Dick Barbour (USA)/Paul Newman (USA) | Dick Barbour (USA) | 2nd | 1st | 16th | 300 laps |
7 July 1979 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 70 | Porsche 935 | 009 00030 | Gr.5 | Rolf Stommelen (D)/Dick Barbour (USA)/Paul Newman (USA) | Dick Barbour Performance (USA) | 2nd | 2nd | 1st | 171 laps |
2 September 1979 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 | 009 00030 | GTX | Brian Redman (GB)/Dick Barbour (USA)/Skeeter McKitterick (USA) | Dick Barbour Racing (USA) | 23rd | 8th | 2nd | 98 laps - DNF |
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 | 009 00030 | GTX | Skeeter McKitterick (USA)/Bob Garretson (USA)/Anny-Charlotte Verney (F) | Dick Barbour Racing (USA) | 9th | 5th | 12th | 599 laps |
22 March 1980 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bob Garretson (USA)/Bobby Rahal (USA)/Kees Nierop (CDN) | Dick Barbour Racing (USA) | 7th | 6th | 6th | 227 laps |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Dick Barbour Racing (USA) | 2nd | 2nd | 4th | 162 laps |
15 June 1980 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 71 | Porsche 935 K3 | 009 00030 | IMSA | Bobby Rahal (USA)/Allan Moffat (AUS)/Bob Garretson (USA) | Dick Barbour (USA) | DNF | 14th | 134 laps - Piston |
5 July 1980 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 71 | Porsche 935 K3 | 009 00030 | Gr.5 | Bobby Rahal (USA)/Jürgen Barth (D)/Bob Garretson (USA) | Dick Barbour Racing (USA) | 38th | 1st | 6 laps - Engine |
27 July 1980 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA) | Dick Barbour Racing (USA) | 2nd | 2nd | 3rd | 40 laps |
17 August 1980 - Mosport 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Dick Barbour Racing/Apple Computers (USA) | 25th | 14th | 2nd | 98 laps - Spin |
31 August 1980 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Dick Barbour Racing (USA) | 3rd | 3rd | 1st | 122 laps |
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bob Garretson (USA)/Bobby Rahal (USA)/Brian Redman (GB) | Garretson Racing/Style Auto (USA) | 1st | 1st | 16th | 708 laps |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bob Garretson (USA)/Bobby Rahal (USA)/Brian Redman (GB) | Cooke Woods/Garretson Enterprises (USA) | 17th | 6th | 4th | 190 laps |
26 April 1981 - Riverside 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA)/Brian Redman (GB) | Cooke-Woods Racing (USA) | 3rd | 3rd | 4th | 197 laps |
3 May 1981 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA) | Cooke Woods/Garretson (USA) | 4th | 4th | 3rd | 53 laps |
14 June 1981 - Le Mans 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 42 | Porsche 935 K3 | 009 00030 | IMSA | Anny-Charlotte Verney (F)/Ralph Kent-Cooke (USA)/Bob Garretson (USA) | Cooke-Woods Racing (USA) | 6th | 2nd | 33rd | 328 laps |
4 July 1981 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Garretson Racing (USA) | 18th | 5th | 10th | 50 laps |
12 July 1981 - Watkins Glen 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | Gr.5 | Rick Mears (USA)/Bob Garretson (USA)/Johnny Rutherford (USA) | Garretson Racing (USA) | 3rd | 3rd | 11th | 168 laps |
26 July 1981 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA) | Garretson Racing (USA) | 18th | 9th | 4th | 18 laps - Crankshaft |
2 August 1981 - Portland 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA) | Garretson Racing (USA) | 3rd | 3rd | 4th | 52 laps |
23 August 1981 - Road America 500 Miles - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Tom Gloy (USA)/Bob Garretson (USA) | Garretson Racing Style Auto Racing (USA) | 4th | 4th | 10th | 119 laps |
27 September 1981 - Brands Hatch 1000 km - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 50 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Flying Tigers-Garretson Racing (USA) | 2nd | 1st | 6th | 230 laps |
29 November 1981 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTX | Bobby Rahal (USA)/Bob Garretson (USA) | Garretson Racing (USA) | 17th | 9th | 13th | 57 laps |
31 January 1982 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 46 | Porsche 935 K3 | 009 00030 | GTP | Mauricio DeNarváez (COL)/Bob Garretson (USA)/Jeff Wood (USA) | Garretson Ent. (USA) | 3rd | 3rd | 12th | 683 laps |
20 March 1982 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Ray Ratcliff (USA)/Grady Clay (USA)/Skeeter McKitterick (USA) | Garretson Development (USA) | 7th | 5th | 9th | 224 laps |
25 April 1982 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Ray Ratcliff (USA)/Grady Clay (USA) | Garretson Development (USA) | 5th | 5th | 14th | 182 laps |
16 May 1982 - Charlotte 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Grady Clay (USA)/Ray Ratcliff (USA) | Garretson Development (USA) | 4th | 4th | 6th | 132 laps |
20 June 1982 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 77 | Porsche 935 K3 | 009 00030 | Gr.5 | Anny-Charlotte Verney (F)/Ray Ratcliff (USA)/Bob Garretson (USA) | Garretson Developments | 11th | 5th | 43rd | 299 laps |
6 February 1983 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA)/Bob Garretson (USA) | Personalized Autohaus (USA) | 9th | 4th | 52nd | 551 laps |
27 February 1983 - GP Miami IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA) | Personalized Autohaus (USA) | 25th | 25th | 5th | 9 laps - Accident |
19 March 1983 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA)/Kees Nierop (CDN) | Personalized Autohaus (USA) | 1st | 1st | 15th | 231 laps |
10 April 1983 - Road Atlanta 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Personalized Autohaus (USA) | 8th | 1st | 28th | 117 laps |
24 April 1983 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA)/Kees Nierop (CDN) | Personalized Autohaus (USA) | 5th | 1st | 18th | 181 laps |
1 May 1983 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA) | Personalized Autohaus (USA) | 9th | 5th | 12th | 47 laps |
15 May 1983 - Charlotte 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Personalized Autohaus (USA) | 5th | 1st | 8th | 133 laps |
30 May 1983 - Lime Rock 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Personalized Autohaus (USA) | 5th | 2nd | 10th | 168 laps |
19 June 1983 - Mid-Ohio 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA)/Kees Nierop (CDN) | WLB Racing (USA) | 24th | 8th | 13th | 166 laps |
3 July 1983 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Wayne Baker Racing (USA) | 18th | 7th | 4th | 56 laps |
24 July 1983 - Sears Point 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Wayne Baker Racing (USA) | 8th | 3rd | 16th | 99 laps |
31 July 1983 - Portland 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA) | Wayne Baker Racing (USA) | 5th | 3rd | 11th | 141 laps |
21 August 1983 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 934 | 009 00030 | GTO | Wayne Baker (USA)/Jim Mullen (USA)/Kees Nierop (CDN) | Wayne Baker Racing (USA) | 18th | 5th | 9th | 98 laps |
27 November 1983 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Tom Blackaller (USA)/Jim Mullen (USA) | Wayne Baker Racing (USA) | 30th | 13th | 6th | 75 laps |
5 February 1984 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Jim Mullen (USA)/Tom Blackaller (USA) | La Jolla Trading Group (USA) | 5th | 5th | 12th | 602 laps |
26 February 1984 - Miami 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Tom Blackaller (USA) | Personalized Autohaus (USA) | 14th | 14th | 17th | 103 laps |
24 March 1984 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Jim Mullen (USA)/Tom Blackaller (USA) | Hino Truck (USA) | 4th | 4th | 12th | 258 laps |
29 April 1984 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Jack Newsum (USA) | Personalized Autohaus (USA) | 16th | 11th | 15th | 169 laps |
6 May 1984 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Tom Blackaller (USA) | Personalized Autohaus (USA) | 11th | 11th | 14th | 49 laps |
3 February 1985 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 009 00030 | GTP | Wayne Baker (USA)/Jack Newsum (USA)/Chip Mead (USA) | Personalized Autohaus (USA) | 9th | 8th | 28th | 624 laps |
25 August 1985 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/Kees Nierop (CDN) | Electrodyne Performance | 12th | 2nd | 23rd | 110 laps |
8 September 1985 - Pocono 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/Kees Nierop (CDN) | Electrodyne Performance | 26th | 9th | 15th | 92 laps |
29 September 1985 - Watkins Glen 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/Kees Nierop (CDN) | Electrodyne Performance | 14th | 4th | 27th | 81 laps |
5 October 1985 - Columbus IMSA GT - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 4th | 4th | 8th | 36 laps |
1 December 1985 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 66th | 22nd | 33rd | 19 laps - DNF |
2 March 1986 - Miami GP IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 33rd | 33rd | 21st | 5 laps - DNF |
5 April 1986 - Road Atlanta IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 2nd | 2nd | 9th | 32 laps |
17 May 1986 - Chartlotte IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 26th | 18th | 6th | 37 laps - DNF |
8 June 1986 - Mid-Ohio 250 km IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 20th | 9th | 8th | 57 laps - DNF |
22 June 1986 - West Palm Beach IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 4th | 4th | 17th | 35 laps |
6 July 1986 - Watkins Glen 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 14th | 3rd | 27th | 133 laps |
24 August 1986 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 38th | 9th | 26th | 82 laps - Mechanical |
1 September 1986 - Lime Rock IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/Mark Hutchins (USA) | Electrodyne Performance | 6th | 4th | 19th | 116 laps |
20 September 1986 - Watkins Glen 500 km GT - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 6th | 6th | 10th | 53 laps |
5 October 1986 - Columbus IMSA GT - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 9th | 9th | 11th | 31 laps |
7 June 1987 - Mid-Ohio 250 km IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 16th | 12th | 9th | 61 laps |
16 August 1987 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 34th | 9th | 27th | 63 laps |
4 October 1987 - Columbus IMSA GT - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 12th | 12th | 12th | 25 laps |