TheIMSA SportsCar Championship, currently known as theIMSA WeatherTech SportsCar Championship under sponsorship, is asports car racing series based in theUnited States andCanada and organized by theInternational Motor Sports Association (IMSA). It is considered the pinnacle of sports car racing in North America, attracting top-tier manufacturers, teams and drivers. The championship featuresprototypes andGT cars competing across various classes and consists of both long-distanceendurance races and shorter sprint races.
The series traces its roots to theIMSA GT Championship, which began in 1971 and ran until 1998. From the late 1990s until 2013, top-level sports car racing in North America was split between the high-techAmerican Le Mans Series and the low-costRolex Sports Car Series. These two series were merged in 2014 to form theUnited SportsCar Championship,[1] which was subsequently renamed as the IMSA SportsCar Championship in 2016.Rolex SA'sTudor brand was the title sponsor of the championship in 2014 and 2015,[2] andWeatherTech has served as title sponsor since 2016.[3]
The season begins with its premier race, theRolex 24 at Daytona, the last weekend of January and ends with thePetit Le Mans, another North American Endurance Cup race, in early October.
On September 5, 2012, it was announced that theGrand-Am Road Racing sanctioning body would merge with theBraselton-basedInternational Motor Sports Association, and as such, both bodies would merge their premiere sports car series, theRolex Sports Car Series andAmerican Le Mans Series respectively, with plans to debut in 2014. On November 20, 2012, the merger committee announced that SME Branding were selected to develop the name, logo and identity of the new series.[4]
On January 8, 2013, the two series' announced a preliminary class structure for the new merged series. Grand-Am'sDaytona Prototype category and IMSA'sP2 would combine into a single-prototype class, with allowances for the uniqueDeltaWing to also compete in the new class. TheLe Mans Prototype Challenge class ofsingle spec cars from the American Le Mans Series would continue as is, although the cars were to switch to Grand-Am'sContinental Tires.[5] The GT class of the American Le Mans Series would remain unchanged, while Grand-Am's GT class would form another GT class, and be combined with the American Le Mans GTC category.[6] The only category of cars not represented in the new series is the American Le Mans Series' P1 category.
The reveal date for the new series was March 14, 2013 at the Chateau Élan Hotel and Conference Center atSebring International Raceway, two days before the12 Hours of Sebring. American Le Mans CEO Scott Atherton announced the new sanctioning body would remainIMSA while Ed Bennett revealed the new titles for the series' five classes. SME Branding Senior Partner Ed O'Hara then announced the new United SportsCar Racing title and logo, a name submitted through a contest won by Louis Satterlee of Florida, a racer in the Florida Karting Championship Series.[7]
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On August 9, 2013,Fox Sports 1 announced it had signed a TV contract with IMSA to televise the entire USCC season between 2014 and 2018.[8]
On September 12, 2013,Tudor was announced as the title sponsor for the series, which was named the United SportsCar Championship. On August 8, 2015, WeatherTech was announced as the new title sponsor for the series, renaming the series to the WeatherTech SportsCar Championship, starting with the 2016 season.[9]
Beginning with the 2019 season, the series is covered exclusively byNBC Sports in the United States. The NBC broadcast network will air nine hours of coverage annually, with the majority of the coverage airing onNBCSN.CNBC and the NBC Sports app will provide supplemental coverage.[10][11] Beginning with 2022,USA Network replaced NBCSN as the cable home to the series.
Originally based on a Canadian series before being acquired by Grand-Am, the Continental Tire Sports Car Challenge (originally known as Grand-Am Cup) is a production-basedtouring car series. The series is split into two classes known as Grand Sport (GS), intended for large capacity GT-style cars, and Street Tuner (ST), consisting of smaller sedans and coupes, some of which arefront-wheel drive. The IMSA Continental Tire Sports Car Challenge until 2013 supported some Rolex Series races but also headlined some of its own dates. This series continued with theUnited SportsCar Championship after the merger and is somewhat comparable to the oldTrans Am Series.
There are four classes in the IMSA SportsCar Championship series, featuring twosports prototype categories and twogrand tourer classes. Some races may only use selected classes of cars, for example: Any class car may be permitted entry atDaytona, while at theNortheast Grand Prix only the GT Daytona Pro (GTD Pro) and GT Daytona (GTD) are entered. Grand Touring Prototype (GTP), Le Mans Prototype 2 (LMP2), and Grand Touring Daytona (GTD) classes are compatible with regulations for the24 Hours of Le Mans.
Classes are also distinguished by regulations on driver lineups, using arating system. GTP and GTD Pro have no restrictions; however, teams competing in LMP2 can only field onegold driver, and teams competing in GTD must field one "amateur" driver with a bronze or silver rating.[12]
The flagship class of the championship that replaced the DPi (Daytona Prototype International) class starting in 2023, featuring cars built to IMSA'sLMDh andAutomobile Club de l'Ouest'sLe Mans Hypercar regulations.
A class introduced since 2019 after being split from the DPi class (2019–2022), it features pro-am driver lineups. The class features cars built byAutomobile Club de l'Ouest's (ACO) 4 licensed manufacturers (Riley-Multimatic,Ligier,Oreca andDallara) to the specifications of theFIA/ACO 2017 Global LMP2 regulations.
A class that utilizes theFIAGT3 specifications that replaced the GTLM class starting in the 2022 Season. No driver class restriction in the GTD Pro class.
A class since 2016 that uses same specification cars as GTD Pro, but at least 1 silver or bronze driver must be in a team. And more than 1 platinum driver in a team is prohibited.
There were five classes formerly used in the IMSA SportsCar Championship series, featuring foursports prototype categories and onegrand tourer class.
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The former flagship class of the championship from 2019 to 2022, featuring cars built to IMSA'sDaytona Prototype International regulations, which are based upon the 2017Le Mans Prototype LMP2 cars. Previously, the DPi's had competed against their base LMP2 counterparts in the Prototype class from 2017 to 2018. Starting in 2019 the LMP2 cars were split into a separate class. The Prototype class had originally consisted ofGrand-Am'sDaytona Prototypes with theAmerican Le Mans SeriesLMP2 prototypes, and theDeltaWing, before the original Daytona Prototypes, and the DeltaWing were phased out of competition at the end of 2016, and replaced by the new DPi cars. Starting in 2023, the DPi class was replaced by the GTP class in an effort to further improve the racing in the Prototype class, as well as create a closer bond to theFIA World Endurance Championship.
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The former flagship class of the championship from 2014 to 2018 before splitting into two separate classes in 2019, featuring cars built to which included classes of prototypes carried over from the previous motorsport category series of theAmerican Le Mans Series and theGrand-Am Rolex Sports Car Series. These cars wereDaytona Prototypes,LMP2 prototypes & theNissan DeltaWing. Starting in 2017 the original Daytona Prototypes, and the DeltaWing were phased out of competition, and replaced by the new DPi cars. At the end of the2018 WeatherTech SportsCar Championship season this class would be split into two separate classes, DPi & LMP2 for the following season in 2019.[citation needed]
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This was aone-make spec class in which all cars that drivers and teams used wereOreca FLM09 LMPC's powered by 6.2LChevrolet V8 engines which made 430 hp each. This class would be used from the 2014 season until the end of the 2017 season.[citation needed]
Introduced in the 2021 season, having been in theIMSA Prototype Challenge category as one of the feeder series to the IMSA WeatherTech SportsCar Championship, this class of prototypes features cars built according toACO's 2020 LMP3 Generation II ruleset specifications from manufacturers such asLigier,ADESS,Ginetta & Duqueine Engineering. The class was removed after the 2023 season due to the growth in grid sizes.[citation needed]
A continuation of the ALMS GT class, it consisted of cars matching the ACO'sGTE specification and competed in the series between the 2014 and 2021 seasons.
