Lotus deputy team principal Federico Gastaldi has hinted a surprises to come from the Enstone squad as the F1 season resumes at the Spanish Grand Prix next weekend.

While it is common for the majority of teams to use Barcelona to introduce their first serious upgrade for cars that have soldiered through four 'flyaway' races before returning to Europe, Gastaldi has confirmed that the factory has not rested in the first couple of months of the season, and is looking forward to being able to make a difference to the E23 even as the car begins to show more promise in the hands of Romain Grosjean Pastor Maldonado.

With the F1 circus having staged two pre-season tests in Barcelona, there will already be a degree of comfort and familiarity for the engineers and drivers, but Gastaldi is keen to bring the latest ideas to the black-and-gold cars.

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"In terms of a racing challenge, it's a fascinating event as it's where every team should be operating at their maximum potential," he explained, "At this time of the season, the circuit is so well known to us all, so there are no excuses if you can't get your car set-up or working well at the Circuit de Barcelona-Catalunya!"

"However, there's potential for some things which could open some eyes in Barcelona and then at the next race in Monaco too. It's fair to say it's busy times at Enstone. We've been working hard on improving the E23 and how we use it, whether through the progress made in our technical debriefs, or the parts being fabricated here in Enstone.

Grosjean has moved himself into the top ten of the championship with back-to-back seventh places in China and Bahrain and could be poised to move further up the order with a similar performance next weekend.

"Romain delivered another textbook driving display in Bahrain and he continues to impress us and other seasoned F1 observers with his on-track prowess," Gastaldi noted, "He is very focused this year and this means he's making the most of every moment in the car. We know as soon as we can unlock a little more pace from the E23, there will be even stronger results to come."

While Grosjean flourishes, however, his team-mate is enduring a torrid start to the year and remains pointless after three DNFs and an unrepresentative 15th place from four races.

"We're still waiting for those first 2015 points with Pastor and no-one wants them more than the man himself," Gastaldi insisted, "Pastor is driving really well and has been the victim of other drivers' mistakes rather too much this year. We know he likes the E23 and can get it to deliver very good pace. He enjoyed great success in Barcelona a few years ago so hopefully that is a good omen for him..."