The team’s final test for 2013 took place in Portugal, with further testing to take place early next year.
Webber was given permission from his current team - Red Bull Racing - to participate in the test, as his contract with Porsche doesn’t officially begin until January 1.
“My first day in this fascinating project was an intense experience for me and I would like to thank Red Bull Racing for giving me the chance to join the project so early,” Webber said
“This is a major and important step for us all. It allows me to integrate with the team quicker and to contribute to further developing the LMP1 race car. We have a long way to go and it involves a lot of hard work. I have no misconceptions at all.”
Suspension and tyre testing with partner Michelin was the focus of the final 2013 test in Portugal, with previous testing having already been completed in France, Italy and Germany.
Webber brought the curtain down on his Formula 1 career at the final 2013-season race in Brazil, and recently announced his intentions to compete in the 2015 Bathurst 12-Hour in a Porsche, driving alongside Eric Bana.
Porsche will field two LMP1 race cars in the nine-round, 2014 sports car World Endurance Championship (WEC), which kicks off at Silverstone in the UK on April 20.
The 2014 Le Mans 24-Hour race is scheduled to begin on June 14.