In 1987, Warwick moved to the Arrows team alongside his Jaguar teammate Eddie Cheever, ending the season with 3 points scored. The 1988 season saw an improvement on the Arrows performance due to the powerful Megatron (a re-badged BMW M12) engine and Warwick finished 7 times in the top 6, earning him 17 points and a respectable 8th position in the championship. His best race of the season was 4th in the Italian Grand Prix at Monza where he finished only half a second behind Cheever. Italy was also notable in that it was the first time since the beginning of 1987 that Arrows engine guru Heini Mader finally solved the problem with the FIA's mandatory pop-off valve which restricted turbo boost. For the first time this allowed both Warwick and Cheever to fully exploit the power of the Megatron engine (restricted to 2.5 BAR boost in 1988) and be much closer to the front than they had been previously.