Listen to this article The Mercedes motorsport boss also revealed the bouncing was so bad around Imola that his drivers were unable to traverse the main straight without lifting off before the Tamburello chicane braking zone, but he said problems with tyre warm-up were behind the Silver Arrows’ massive gap to Ferrari in FP1. Russell’s car was spotted porpoising heavily as he approached Tamburello during the Friday afternoon practice running – the W13 bouncing so hard that sparks flew from it each time it hit the ground. Speaking to Sky Sports F1 after FP1 had finished, Wolff said “we had George bouncing so much that he actually broke the stay on the floor. You can’t drive [down the main straight] – you have to lift on the straight.” Mercedes fitted the metal floor stays to the W13 for the first time at the end of Barcelona testing, which it topped before introducing a drastically different design for the following second test in Bahrain that has so far been off the ultimate pace. At the time in Spain these parts were not allow …