In 1985, Renault selected six brand-new production Renault 5 Turbos to act as donor cars for production-class racing in the French Supertouring Championship.

Whilst these cars saw initial success, Renault were determined to win outright in 1987 so, late in 1986, three of the six cars were chosen and heavily re-prepared for the 1987 season to be driven by Frenchmen Jean-Louis Bousquet, Jean Ragnotti and Erik Comas.
These three ‘Superproduction’ models were fitted with roll cages by Matter, while chassis development was carried out by technicians at Sonica, who lowered the ride height, widened the track and developed the suspension so that the cars were close to the regulation limit.

Renault F3 engine specialists, Sodemo Moteurs, produced a stroked 1419cc version of the R5T engine (nominally 1397cc), Sodemo and SYTEL used their own ECU, ignition and fuel injection systems, designing a new custom inlet manifold for the purpose, and with a wild new camshaft and a new Garret T4/T3 turboch...