Romain Grosjean has revealed that his Lotus E22 prior to the Chinese GP was both "very unstable and unpredictable."
Last season Lotus finished fourth in the Constructors' Championship with 14 podiums including a victory in the Australian GP.
This season, though, is has been a very different story.
Not only has engine supplier Renault struggled with their new V6 engine but Lotus' E22 has also proven difficult.
Four races in Lotus have yet to score a single World Championship point although Grosjean believes they did take a step forward in China.
Speaking about his E22, he told Autosport: "It was very unstable and unpredictable.
"The front is less obvious on TV but it was...
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