– Sebastian Vettel says he and Red Bull are still searching for improvements with Renault's new turbocharged power unit. The French manufacturer has struggled to run its latest creation at its optimal level so far this season, but explained that it would be "closer to the limit" than ever before at this weekend's Chinese Grand Prix. Although he noticed progress at the Shanghai circuit on Friday, Vettel reckons there is much more to come in future races. "It's not as if we've gained power," said the reigning World Champion. "We'd love to but that's not really possible. Tuning the bits that we have, it feeds the feeling a lot and that's where we still need to...
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