Lotus launched their new E22 car in Bahrain on Wednesday morning, the 11th and final Formula One team to do so, ahead of the start of the 2014 season.
The Enstone team had released images of the car at the end of January, with its 'tusk' nose design markedly different from the other 10 cars that will compete this year.
Lotus had skipped the year's first official pre-season test in Jerez last month, but did complete 100km with the car at the same circuit during a behind-closed-doors filming session the next week.
Pastor Maldonado drove the car in Jerez but his team-mate Romain Grosjean will get the first run in Bahrain this week.
The Frenchman will also test on the 5.412km Sakhir on Thursday, while Maldonado will be back behind the wheel on Friday and Saturday.
The last couple of months have been a struggle for Lotus, with Kimi Raikkonen and Eric Boullier departing the team, while their long-expected sponsorship deal with Quantum Motorsport seems unlikely to come to fruition.