The Super Touring Under (STU) class in SCCA road racing offers a unique playground for automotive enthusiasts who enjoy extensive vehicle development. This episode of the Hoosier Shop Manual series explores how STU bridges the gap between production street cars and highly modified race machines. Unlike more restrictive classes, STU rules provide racers with the creative freedom to upgrade suspension, brakes, and engine components to suit their specific driving styles, resulting in lap times that are significantly faster than those seen in the related Super Touring Lite (STL) category.
Throughout the video, the presenter illustrates the diversity of the class, where front-wheel, rear-wheel, and all-wheel-drive platforms compete on equal footing thanks to a balancing rule set. Whether you are a newcomer looking to build your first competitive race car or an experienced professional seeking to refine a veteran platform, STU accommodates a broad range of experience levels. The series emphasizes that you do not need a massive budget to start, but rather an iterative approach to upgrading your chosen chassis. By highlighting the competitive environment of national championship racing, this guide serves as an invitation for prospective racers to join the SCCA and start building their own unique race car.