The radical Nissan DeltaWing sportscar project undertook its first wet weather running yesterday at Snetterton.
Marino Franchitti and long-term Nissan driver Michael Krumm shared control of the car at the Norfolk circuit, which also marked the project's first European test.
Franchitti, who ran in the morning when conditions were at their worst, said the first wet run had provided the team with important data and given them a clear direction for future development.
"Mother nature really did us a favour today, because it was great to get another run in the wet," Franchitti explained.
"The day allowed us to try the wet tyres in a real world situation - we didn't have to wet the track at all, it was a proper wet, rainy day. [It] has really given us some important data and provided Michelin with some clear direction for future development."
Nissan Europe's general manager Darren Cox added: "The whole Nissan DeltaWing team is still on a massive learning curve.
"Testing in the States was a stable, predictable way of doing the initial groundwork but this exciting car is going to be racing in the French countryside.
"Today, the whole team got a taste of the conditions they may well face on June 16/17, so it may not have been much fun in the Norfolk rain, but it's about the best thing that could have happened for a project and a car that will face an enormous challenge just to make the end of the race."