For 1987 the engines were fitted with a FIA approved pop-off valve which was mandatory for all turbo engines in the season with turbo boost restricted to 4.0 bar (previously turbo boost was restricted only by what the engineers felt the engines could handle, though most, including the BMW M12, usually went no further than 5.6 Bar). Power from the engine, which always had the ability to handle high boost settings, was still estimated to be over for qualifying and around for races with the cars also restricted to just 195 litres of fuel per race. During the season the team continually experienced problems with the pop-off valve cutting in well below the 4.0 Bar limit in both qualifying and races, with Warwick reporting at the opening race in Brazil that the valve was restricting boost to 3.5 Bar, and sometimes it was cutting in at 2.6 Bar (a loss of around ), a situation that didn't improve throughout the season. Without the resources and financial backing available to the likes of Ferrari or Honda, it would take Mader until the three quarters of the way through the season to solve the problem.