Lotus technical director Nick Chester believes Renault's new energy recovery systems are responsible for "disturbing" its drivers Romain Grosjean and Pastor Maldonado.
Under the 2014 regulations, the augmented energy recovery systems require a brake-by-wire system in order to stabilize the car under braking while energy is harvested.
Due to the complexity of relationship between the energy and braking systems, combined with the problems Lotus have had with their Renault power units during testing, Chester admitted that it would take the Enstone team a considerable amount of time to perform at an optimal level this year.
"With the chassis itself the level of grip isn't too...
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