Renault chassis technical director Nick Chester admits his team is concerned by the impressive gains Ferrari has made to its engine through the first part of the 2018 Formula One season.
It is now widely accepted that Ferrari has overtaken Mercedes as F1's leading power unit with the exact reasons for the Italian manufacturer's gains still unknown. Ferrari's impressive rate of improvement has allowed its customer teams, Haas and Sauber, to perform strongly during the first half of the season with Haas now just 16 points behind Renault in the race for fourth in the constructors' championship.