The Tatuus MSV GB4-025
The groundbreaking Tatuus MSV GB4-025 car
The GB4 Championship utlises the class-leading Tatuus MSV GB4-025 car, which was introduced ahead of the 2025 season.
The car, which raced in GB3 as the Tatuus MSV-022 from 2022 to 2024, is a significant upgrade on the F4-T014 package previously used in GB4, introducing key safety features such as the halo into the championship for the first time.
Modified to become an entry-level machine, the Tatuus MSV GB4-025 chassis retains all the updated safety features utilised in its GB3 specification, including stronger side-impact and rollover protection qualities.
The car uses a single-plane front and rear wing setup with a shortened diffuser, while the conventional overhead airbox remains a feature. Aerodynamic performance is improved over the previous GB4 car.
GB4 utilises a hugely popular and reliable two litre, four cylinder, normally aspirated Mountune unit with a specially designed inlet manifold and throttle body configuration. The car will features the same GB4 power to weight ratio, allowing the series to continue running drivers who are 15 years old.
The GB4-025 retains the Cosworth Electronics SQ6 ECU and the trusted Sadev six speed gearbox with Magneti Marelli gear shift system. The technical package has been evolved to achieve optimum equality and reliability for GB4 competitors.
The new car further heightens GB4’s offering to young drivers looking to make their first steps into single-seater racing at a cost-effective level, before moving up to FIA F4 or GB3. GB4's package also includes an exceptional prize structure comprising a £50,000 career contribution for the series champion, and a €50,000 fund for this year’s lead female driver, should she claim a drive in F1 Academy next year.
MSV Chief Executive Jonathan Palmer said: “The Tatuus MSV-022 GB3 car has been one of the most widely-acclaimed packages in junior single-seater racing for quite some time, and in its new GB4 evolution, the car maintains the championship’s cost-effective focus, while offering a significant step forward in safety.
“The move towards a naturally aspirated engine ensures even greater parity from a well trusted power unit. With a proven, reliable and extremely popular technical package, combined with a class-leading prize pot in excess of £100,000, the new-look GB4 Championship is an even stronger first step on the ladder for the most talented young drivers emerging from karting, Ginetta Juniors and other junior categories, before moving on to F4 or GB3 and hopefully all the way up to F1.”