In the early 90's as the Group C championship was in crisis in Europe, IMSA's GTP class was also becoming stagnant. Toyota's GTP cars lapped the field in most of the races in 1992. The same year Jaguar anounced their withdrawl from the series after ten years of contiuous involvement. A class of open-cockpit spyder prototypes was created called 'World Sports Cars'. This was introduced in 1993, and completely repleced the GTP cars in 1994.
The Ferrari 333SP epitomizes this concept, and endurance races had a prototype by the 'prancing horse' for the first time since 1972. The creators of the WSC rules must have let out a large sigh of relief when such a good-looking and good-performing car was made available to their teams. Other manufacturers such as Riley & Scott and Kudzu also built cars to this spec.
Whenever such a huge rule change occurs as did between 1993 and 1994, there is bound to be sume odd occurances. Some teams simply cut the tops off of their GTP cars and turned them into open WSC cars.
1994 IMSA Classes | ||
|---|---|---|
Name |
Description |
Eligable Cars |
WSC |
Open-topped Prototypes |
Spice, Kudzu, Ferrari 333SP |
GTS |
Heavily Modified (tubeframe) and/or high powered production-based Grand Touring cars |
Nissan, Corvette, Camaro |
| GTU | Production-based Grand Touring cars | Mazda RX-7, Porsche 911 |
 
International Motor Sports Association 1994 | |||||
Place |
Car |
Car # Class |
Model |
Ref. # |
Image |
| Daytona 24 Hours | |||||
| 1 | Nissan 300ZX
Scott Pruett Butch Leitzinger Paul Gentilozzi | 76 GTS | Kyosho | 03217F | ![]() |
| 41 | Nissan 300ZX
Steve Millen John Morton Johnny O'Connell | 75 GTS | Kyosho | 03217E | ![]() |
| Other Races | |||||
| World Sports Car Class | |||||
| 0 | Ferrari 333SP | 0 | Minichamps | 430 947400 | |
| 3 | Ferrari 333SP Andy Evans Fermin Velez | 03 | Minichamps (Cancelled) | 430 947403 |   |
| 5 | Ferrari 333SP Mauro Baldi | 5 | Minichamps | 430 947405 | |
| 30 | Ferrari 333SP Gianpiero Moretti Eliseo Salazar | 30 | Minichamps | 430 947430 | |
| 50 | Ferrari 333SP 'Snap-on' Jay Cochran | 50 | Minichamps | 430 947450 | |
This model sits all alone... just the one Kremer from this entire year of racing. But this car did prove that a common set of rules between Europe and the USA would bring some cross-competition.
International Motor Sports Association 1995 | |||||
Place |
Car |
Car # Class |
Model |
Ref. # |
Image |
| Daytona 24 Hours | |||||
| World Sports Car Class | |||||
| 1 | Kremer K8
Giovanni Lavaggi Jürgen Lässig Christophe Bouchut Marco Werner | 10 | Spark | S0321 | ![]() |
An odd choice for a factory effort if there ever was one, as Oldsmobile was usually not considered a "sporty". But GM did it right, and had Pratt & Miller design the car, which according to many reports was not half bad...
Pratt & Miller would go on to create the now-legendary Corvette C5-R and C6.R race cars that have so dominated the modern-day GT1 class.
The classes would be renamed GTS-1 and GTS-2 for this year, and the influence of the BPR series in Europe was felt. Instead of tube-frame chassis, some GTS-1 cars had true unibody frames, making them closer to the "supercars" of the European series.
1996 IMSA Classes | ||
|---|---|---|
Name |
Description |
Eligable Cars |
WSC |
Open-topped Prototypes |
Ferrari 333SP, Riley & Scott MKIII |
GTS-1 |
Heavily Modified (tubeframe) and/or high powered production-based Grand Touring cars |
Porsche 911 Turbo, Dodge Viper |
| GTS-2 | Production-based Grand Touring cars | Porsche 911 |
IMSA 1996 | |||||
Place |
Car |
Car # Class |
Model |
Ref. # |
Image |
| World Sports Car Class | |||||
| 1 | Riley & Scott Mk III Wayne Taylor Scott Sharp Jim Pace | 20 WSC | Spark | s S0007 | ![]() |
| 2 | Ferrari 333SP 'MOMO' Max Papis Didier Theys Bob Wollek Bill Auberlen | 30 WSC | Minichamps | 430 967430 | |
| GTS-1 Class | |||||
| 7 | Oldsmobile Aurora 'Aurora' Irv Hoerr Darin Brassfield Rob Morgan Joe Pezza | 5 GTS-1 | Minichamps | 430 145605 | |
| 29 | Dodge Viper GTS-R Price Cobb Mark Dismore Shawn Hendricks Tommy Archer | 98 GTS-1 | Minichamps | 430 961498 | |
| 50 | Oldsmobile Aurora 'Aurora' Irv Hoerr Darin Brassfield Brian Cunningham | 1 GTS-1 | Minichamps | 430 145601 | |
| 54 | Porsche 911 GT2 'STP' Hans-Joachim Stuck Bill Adam Thierry Boutsen | 74 GTS-1 | Minichamps | 430 966774 | |
| Test | Oldsmobile Aurora 'Aurora' Darin Brassfield | 1 GTS-1 | Minichamps | 430 145600 |   |
| GTS-2 Class | |||||
| 9 | BMW M3 'Valvoline' David Donohue John Paul Jr. Javier Quiros Halsmer | 06 GTS-2 | Minichamps | 430 962306 | |
| 53 | BMW M3 'Valvoline' Pete Halsmer Dieter Quester Manfred Wollgarten Kermit Upton | 07 GTS-2 | Minichamps | 430 962307 | |
In 1997, the IMSA name was dropped in favor of Professional Sports Car Racing. This was also the year that the growing BPR series became the FIA GT, and was making waves by attracting major manufacturers like Mercedes and Porsche. In response, the GTS-1 category was formed to allow these FIA GT1 supercars. Champion and Rohr raced Porsche 911 GT1's, and Panoz made its racing debut with the Esperante GTR run by the factory (The French DAMS team ran a semi-works effort in the FIA GT). The production classes were rearranged to make GTS-2 become GTS-3, and a new class of GTS-2 was created to mimic the FIA GT2.
The sprint races were run separately for GT and prototypes, and the long endurance races had all classes run together.
The Sebring-Winning 333SP has a very controversial history. At the time, Team Scandia driver-owner Andy Evans was also the owner of the entire IMSA series. According to many informed reports he used his influence to allow himself to make up time during a full-course caution period. This resulted in a very maligned victory.
The Doran/Lista 333SP is given a catalog number that implies it is from 1996. All of the given the chassis and race data indicate it is most definitely from 1997. This car would eventually have a Judd engine and be nicknamed the "Fudd"
Professional Sports Car Racing 1997 | |||||
Place |
Car |
Car # Class |
Model |
Ref. # |
Image |
| Daytona 24 Hours | |||||
| World Sports Car Class | |||||
| 1 | Riley & Scott Mk III James Weaver Butch Leitzinger Rob Dyson Andy Wallace | 20 WSC | Spark | SCRS 08 |   |
| GTS-1 Class | |||||
| 7 | Porsche 911 GT1 'Rohr' Jochen Rohr Andy Pilgrim Robert Nearn | 01 GTS-1 | Minichamps | 430 976601 | |
| Sebring 12 Hours | |||||
| World Sports Car Class | |||||
| 1 | Ferrari 333SP 'Scandia' Andy Evans Fermin Velez Yannick Dalmas | 3 WSC | Minichamps | 430 977603 | |
| 48 | Ferrari 333SP 'Scandia' Andy Evans Fermin Velez Rob Morgan | 43 WSC | Minichamps | 430 977643 | |
| 0 | Ferrari 333SP Fredy Lienhard Didier Theys | 27 WSC | Minichamps | 430 967627 | |
Car numbers have traditionally been kept from year to year. This has led to certain numbers being "owned" by teams, even after they have ceased to exist. If you are starting a ubiquitous Porsche GT3RS effort, you would be wise to not apply any of the following to the side of your car, lest you be pelted with beer cans at Sebring.
Notable IMSA Car Numbers | ||
|---|---|---|
Number |
Team |
History/Status |
14 |
Al Holbert |
Considered "retired" by IMSA staff |
16 |
Dyson |
Used since the 1985 season when they ran the Porsche 962 |
27 |
Doran |
Adopted as a very appropriate Ferrari number when they bought the 333SP. Use continues on the 2002 Daytona-winning Dallara. |
30 |
MOMO |
The distinctive red-and-yellow livery and #30 were used on many cars from the early 80's until 1998. Since then a few minor teams have run with this number. I personally think it should be held in "reserve". |
38 |
Champion |
Champion switched to #38 when they "moved up" to the prototype classes. This number has appeared on the Porsche GT1, Lola, and Audi cars. |
42 |
BMW Works Team |
I'd keep it open because they say they're coming back next year.. |
43 |
BMW Works Team |
See above |
44 |
Group 44 Jaguar |
Many beautiful cars were run sucessfully with this number during the halcyon GTP era. The number has been used occasionally since. |
59 |
Brumos Porsche |
Considered "retired" by IMSA staff, but has been used by recent Brumos-related efforts in the Grand-Am series. |
63 |
Jim Downing Kudzu |
Used on many Mazda-powered cars. First appeared in 1982 and was used on various Kudzu efforts as late as 2001. |