Purpose: The purpose of the Pirelli SRO GT4 America® Championships is to provide teams, manufacturers and aftermarket suppliers a competitive production-based race series in which to prove their products. Television: races are aired in tape delayed shows on NBC sports. Additionally all races are available to watch live streaming at www.world-challengeTV.com
The series consists of four driver classifications and five classes of vehicles: GT3, GT4, (Sprint, SprintX, East and West), and Touring Car, consisting of TCR homologated cars, as well as separate TC and TCA classes featuring modified production vehicles
Homologation of Vehicles: In addition to the general series rules that apply to all homologated vehicles, each vehicle model that is homologated into the Pirelli SRO GT4 America Series has a set of specifications assigned to it on a Vehicle Technical Specification sheet (VTS) in order to give equivalent overall performance capabilities to a wide range of vehicles. Adjustments to a vehicle’s VTS sheet will be made until a competitive package is developed. Vehicles may be submitted for homologation up to a year before it goes on general sale to the public, and until that particular body style goes out of production throughout the world.
Eligibility: Cars that have been homologated for competition in the Pirelli SRO GT4 America Series are eligible for a full-year of competition from the time it is homologated, until that particular body style has been out of production throughout the world for four (4) years. After a body style has been out of production for four (4) years, it may continue to compete in no more than five (5) races total with a single driver, for an additional three (3) years.
Competition Adjustments: In order to keep the competition close within the Pirelli SRO GT4 America series, competition adjustments will be made to a vehicle model when deemed necessary. Competition adjustments will primarily be done through adjustments to the base weight, the engine speed limit and/or the required restrictor size.
From the showroom to the speedway, the IMSA Michelin Pilot Challenge is IMSA’s showcase for the latest in American-made and imported high performance sports cars, coupes and sedans straight from the dealer showroom floor. With modifications permitted only in the area of safety and competition, the Michelin Pilot Challenge is home to the same cars seen on streets and highways around the world every day. Racing takes place in three classes, Grand Sport (GS) and Touring Car (TCR), with the series running a 10-race schedule in tandem with the WeatherTech Championship.
The IMSA Michelin Pilot Challenge features sports cars from worldwide manufacturers, straight from the showroom floor, raced side-by-side with only minor modifications. The Michelin Pilot Challenge has two different classes:
Grand Sport (GS) - As with all Michelin Pilot Challenge cars, GS cars start out as stock, production model cars that race with only minor modifications. Following the introduction of GT4 specifications, a wealth of manufacturers like Audi, BMW, Chevrolet, Ford, McLaren, Mercedes-AMG and Porsche have flocked to the class. The engines are tuned to produce between 400 and 500 horsepower and are capable of reaching speeds up to 175 mph.
Touring Car (TCR) - The new-for-2018 TCR class is intermediate in performance to GS and ST. Manufacturers such as Alfa Romeo, Audi, Honda and Volkswagen take to the track in four- or five-door production model cars that only have minor modifications and follow universal specifications. The engines are tuned to produce between 300 and 350 horsepower and are capable of reaching speeds up to 155 mph.