Welcome to the IMSA History unofficial website

This site is aimed at bringing you memories from the glory days of sportscar racing in the US.



 1 06 FORD MUSTANG GTP Klaus Ludwig-Tim Coconis 115 Laps 1.GTP
 2 83 DATSUN 280ZX Tc Don Devendorf-Tony Adamowicz 113 Laps 1.GTO
 3  6 FORD MUSTANG Tc Bobby Rahal-Geoff Brabham 113 Laps 2.GTP
 4 20 PONTIAC FIREBIRD Paul Canary-Eppie Wietzes 108 Laps 2.GTO
 5 38 MAZDA RX7 Roger Mandeville-Amos Johnson 107 Laps 1.GTU
 6 78 PONTIAC FIREBIRD Rob Dyson-Ken Slagle 107 Laps 3.GTO
 7 63 MAZDA RX7 Jim Downing-John Maffucci 107 Laps 2.GTU
 8 45 LOLA T600 Chevrolet HU11 John Morton-Bob Lobenberg 107 Laps 3.GTP
 9 82 MAZDA RX7 Joe Varde-Jeff Kline 107 Laps 3.GTU
10 15 LOLA T600 Chevrolet HU4 John Kalagian-John Mills 106 Laps 4.GTP
11 55 BMW M1 4301040 Diego Montoya-Fomfor 106 Laps 4.GTO
12 39 PHOENIX JG1 Chevrolet JG-1 John Gunn-Gary Belcher 104 Laps 5.GTP
13 17 MAZDA RX7 Al Bacon-Lance Van Every 102 Laps 4.GTU
14 23 PORSCHE 914/6 914 043 0538 Earl Roe-Tim Selby 101 Laps 5.GTU
15 14 MARCH 83G Porsche 4 Al Holbert-Jim Trueman 101 Laps 7.GTP
16 86 LOLA T600 Porsche HU8 Bruce Leven-Jim Adams 101 Laps 7.GTP
17 34 PORSCHE 924GTR George Drolsom-Deborah Gregg 99 Laps 6.GTU
18  9 PORSCHE 934 009 00030 Wayne Baker-Jim Mullen-Kees Nierop 98 Laps 5.GTO
19 57 DATSUN 280ZX Reed Kryder-Drake Olson 97 Laps 7.GTU
20 27 MAZDA RX7 Jim Fowells-Ray Mummery 96 Laps 8.GTU
21 93 MAZDA RX7 Frank Rubino-Roy Newsome 95 Laps 9.GTU
22 96 PORSCHE CARRERA RSR Philip Byrd-Richard Silver 93 Laps 7.GTO
23 49 CHEVROLET CORVETTE Dan Schott-Steve Schmidt 91 Laps 7.GTO
24  2 PORSCHE 911 Mark Altman-Gary Altman 90 Laps 10.GTU
25  3 PORSCHE 914/6 473 290 2456 Richard Graves-Alice Graves 87 Laps 11.GTU
26 64 PORSCHE CARRERA RSR John Hulen-Ron Coupland 86 Laps 8.GTO
27 21 CHEVROLET CORVETTE Terry Farber-Steve Gentile 83 Laps 9.GTO
28 13 PORSCHE 911 Bob Johnson-George Wilkie 80 Laps 12.GTU
29 30 PORSCHE 911 Ron Case-Jack Rynerson 77 Laps 13.GTU
30  4 CHEVROLET CAMARO Billy Hagan-Gene Felton 77 Laps 10.GTO
31 35 PORSCHE CARRERA RSR Jack Griffin-Bobby Hefner 73 Laps 11.GTO
32 98 TOYOTA CELICA Mike Gillman-Scott Gillman 65 Laps 14.GTU
33  1 PORSCHE 935L 935L John Paul Jr-Preston Henn 63 Laps 8.GTP
34 26 BUICK REGAL Robert Overby-Don Bell 58 Laps 9.GTP
35 71 DATSUN 280ZX Charles Morgan-Jim Miller 58 Laps 15.GTU
36 56 PORSCHE 934 930 670 0162 Rick Borlase-Werner Frank 53 Laps 12.GTO
37 29 DATSUN 280Z George Philips-Tim Toomey 36 Laps 16.GTU
38 85 DATSUN 280ZX Logan Blackburn-Dave Frellsen 33 Laps 17.GTU
39 75 CHEVROLET CORVETTE Richard Anderson-Bard Boand 33 Laps 13.GTO
40 03 CHEVROLET CORVETTE Lloyd Frink-Dave Barnett 31 Laps 14.GTO
41 25 MARCH 83G Chevrolet 3 Kenper Miller-David Cowart 29 Laps 10.GTP
42  5 PORSCHE 935K3 000 00013 Bob Akin-John O'steen-Dennis Aase 25 Laps 11.GTP
43 37 PONTIAC FIREBIRD Dave Watson 16 Laps 15.GTO
44 12 MARCH 83G Chevrolet 2 Al Leon-Art Leon 12 Laps 12.GTP
45 43 BMW M1 Paul Davey-Don Walker 8 Laps 16.GTO
46 41 CHEVROLET CORVETTE Rusty Schmidt-Scott Schmidt 7 Laps 17.GTO
47  7 MAZDA RX7 Pete Halsmer-Rick Knoop 6 Laps 18.GTO
48 24 PORSCHE 935JLP2 009 00043 Ken Madren-ML Speer 5 Laps 13.GTP

Cars that did not start

    8 GRID S1 Ford GA01 Skeeter McKitterick-Emilio de Villota GTP
   11 MARCH 82G Chevrolet 4 Marty Hinze-Randy Lanier GTP
   16 DATSUN 280Z David Miller-Bill Miller GTU
   18 BMW M1 Fomfor GTO
   40 BMW M1 430 1225 Uli Bieri-Matt Gysler GTO
   47 CHEVROLET CAMARO Michael Kehoe-Jerry Kehoe GTO
   79 PORSCHE 924GTR Bob Bergstrom-Tom Winters GTU
   88 MARCH 83G Chevrolet Ken Murray-Emory Donaldson GTP
   91 PORSCHE 934 930 890 0014 Chet Vincentz-Mark Hutchins GTO

Ford Mustang GTP stunning debut

The race was to feature the debut of the new Ford Mustang GTP cars. Those cars were stunning and were front engined, as Ford dictated it, and powered by a turbocharged 2,3L dohc four. Klaus Ludwig and Tim Coconis drove one car while Bobby Rahal and Geoff Brabham the other one. They would have to face a regular field, with Al Holbert's March 83G Porsche still the strongest of them all. Jim Trueman was co-driving Al Holbert. Kenper Miller and David Cowart had another March 83G, Chevrolet powered, with Red Lobster sponsorship. The Leon Bros also had a new 83G. Three Lola T600 were entered, with Conte Racing, Kalagian and Bayside Racing each fielding one car. The last car being Porsche powered, with Bruce Leven co-driven by Jim Adams. John Kalagian, who had purchased the ex-JLP car, drove it with John Mills. Bob Lobenberg and John Morton were at the wheel of the Conte Racing car. Only three Porsche 935s were entered, as the GTP cars were now taking over. Preston Henn was running the car built by Andial and was partnered by John Paul. Ken Madren drove the JLP2 car while Bob Akin was still running his 935K3 with John O'steen. John Gunn was also fielding his Phoenix JG1 Chevrolet. Forty eight cars were taking the green of this 500 Miler.

The remainder of the field consisted of GTO and GTU cars, as per usual. The Electramotive Datsun 280ZX Tc was the favorite of the big bangers, with Don Devendorf and Tony Adamowicz at the wheel. The Chevrolet Camaro was to be its strongest opponent, with Gene Felton and Billy Hagan driving. A string of BMW M1s with Diego Montoya-Fomfor, and Paul Davey could be a threat. A pair of well driven Pontiac Firebirds could also not only play second fiddle, entered by Rob Dyson and Paul Canary. The GTU category would have to be less interesting, with Mazda and Datsun fighting it up. Roger Mandeville and Jim Downing were long time opponents, and they would again run for the win. Joe Varde and Jeff Kline were also in contention for the win. Logan Blackburn fielded his Datsun 280ZX and would be the fastest in practice. AAR entered a single Toyota Celica for Scott and Mike Gillman, who were new to the team.

The practice sessions saw Al Holbert take another pole position in his March 83G Porsche, just ahead of Klaus Ludwig and Tim Coconis. The race was to be somewhat amazing, as Al Holbert took the lead in the first lap, followed by Klaus Ludwig. On lap six, the Ford Mustang GTP took the lead, while Geoff Brabham pitted in the second car with a fluid leak. Klaus Ludwig would lead the race for the next laps, followed by Al Holbert, John Morton, Kenper Miller, John Kalagian and John Paul Jr, who was hampered by brake problems. Then, the cars would have to pit for fuel and the Red Lobster car would retire with a broken gearbox. The CRC Chemical March 83G Porsche made a lengthy pit stop with severe misfire. The Ford Mustang GTP was easily maintaining its position, with John Morton and Bob Lobenberg in second place.

An off-course would cost the Conte Lola T600 a great deal of time, as the nose had to be changed. The TBird Porsche 935L was out of the race with a broken wastegate. At mid point, Klaus Ludwig and Tim Coconis were always in the lead, now followed by John Kalagian and John Mills in the Kalagian/Ardisana Lola T600 Chevrolet. Bobby Rahal and Geoff Brabham were back in third place, with Don Devendorf and Tony Adamowicz in fourth place in the Electramotive Datsun 280ZX Tc! The GTU class was led by Roger Mandeville and Amos Johnson, who were chased by Jim Downing and John Maffucci. While the leading car ran trouble free, the same could not be told about the second Ford Mustang GTP, who pitted twice. The first time with the fire extinguisher going off in the cockpit and the second time with a misfire. The car was now in fourth place. Then it was the leading car who was to be slowed by a misfire, and the Lola was about to pass the Ford when the clutch let go. John Kalagian and John Mills would have probably won!

Then, it was the weather which turned into a steady rain. The two Ford Mustang GTPs were now running at a very slow pace, in the deluge. Don Devendorf Datsun was now running faster, but three laps down. He could not make up for the gap. While the track was getting completely sodden, it was clear that the race had to be shortened. The checkered fell on lap 115, shortening the race by ten laps. Ford took first and third place, with Klaus Ludwig and Tim Coconis winning in the Ford Mustang GTP. It would be the first and only win for this very spectacular car. Geoff Brabham and Bobby Rahal were third, behind Don Devendorf and Tony Adamowicz, who ran in a magnificent way to capture the GTO class win. Paul Canary and Eppie Wietzes were second, driving a Pontiac Firebird. The GTU class was won by Roger Mandeville and Amos Johnson, in the Mandeville Auto Tech Mazda RX7, who defeated Jim Downing and John Maffucci in the RGP500 Mazda RX7. Joe Varde and Jeff Kline took third in the Trinity Racing Mazda RX7, a perfect Mazda sweep.