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Modstox is a "budget" contact short oval formula started in 1993 that originally used Fiat 126 engine, gearbox and suspension. The formula quickly became popular, racing at tracks such as Stoke, Buxton, Bolton, Grimley and Blyton. At the end of the 1995 season several new cars were built but this time in front engined Reliant configuration, utilizing the Reliant rear axle whilst retaining the Fiat 126 transverse spring front suspension.
The formula continued to flourish at Stoke right up to the end of the 2001 season, which saw the closure of Stoke to four wheeled motor sport. With a lot of uncertainty over the future of the formula several top grade drivers made a move to F1’,F2 and V8’s. From 2002 to 2009 Modstox continued at independent “grassroots” venues such as Trent, Grimley, Brampton , Blyton, and Ruabon.
Superficially the cars look similar to F1 and F2 cars but a closer look reveals that the formula is designed to ensure racing can be done on a strict budget. The engines are kept to a fairly standard 850 design with limited modifications to the cylinder head. A racing camshaft is allowed more on the grounds of “engine policing” than the need for more power but the standard SU 1¼” carburettor is retained. Suspension utilises leaf springs rather than expensive adjustable coilovers with rear axles being the Reliant Robin or Morris Minor. Some of the cars retain their original fiat 126 front suspension but newer cars have started to use more readily available hubs and wishbones from cars such as Fiat Punto, Nissan Micra, and Vauxhall Corsa.
Perhaps the most important cost-capping rule restricts the tyres allowed within the formula. Tyres must cost a maximum of £20.00 and only two competition tyres are allowed on tarmac or concrete surfaces.