Pre-season testing in Rio de Janeiro at the newly named Autódromo Internacional Nelson Piquet (formerly known as the Jacarepaguá Circuit) was dominated by Ferrari seemingly continuing on with the form that saw Gerhard Berger win the final two races of 1987. Both Berger and Michele Alboreto set times during the Rio tests which were significantly faster than anyone else, and faster than had been recorded during the 1987 Brazilian Grand Prix, prompting rumours that the Scuderia had been running their cars without the FIA's mandatory pop-off valve, or had the valve set at 1987's 4.0 bar limit. The rumours seemed to carry weight when just a month later for the opening race at the same circuit when the pop-off valves were to be in use, neither Berger nor Alboreto could get near their testing times from the previous month, and both were well down on top speed compared to the McLaren and Lotus-Hondas.