Porsche LMP1 managers Fritz Enzinger and Andreas Seidl say they were disappointed that its 919 Hybrid could not step up its dry weather competitiveness at the Circuit of the Americas despite a concerted development programme to improve its pace.

The manufacturer had been public about its decision to compromise its chances at the opening two World Endurance Championship rounds at Silverstone and Spa in order to focus on the Le Mans 24 Hours, but had indicated it will be turning its attentions to honing the car for the remaining WEC events, starting in Austin.

However, in the dry neither Porsche 919 Hybrid could match the Toyota and Audi come race day, with both the #14 and #20 machines slipping back in the first hour.

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Though the #14 machine would prove competitive in the wet and even led for a portion as different strategies played out, reliability issues would consign it to fourth at the finish, much to Seidl's frustration.

"The outcome of the race is obviously disappointing," he said. "It was hard work and mixed conditions. In the beginning of the race, when it was dry and hot, we could not go at the same pace as the leaders, but in the rain we have been surprisingly strong. For the restart we split strategies to increase our chances. The decision to put slick intermediate tyres on car number 14 enabled us to take the lead. In the end a problem in the powertrain cost us a podium finish."

Indeed, Enzinger suggested the return on the amount of development work that had been completed in the long three-month break between events hasn't been as good as expected.

"Unfortunately we did not manage to turn the development work of the recent months and the good qualifying result into the amount of championship points we wanted," he said. "Similar to what happened in Le Mans, we had chances to get a podium, perhaps even a race win. We will carefully analyse what has led to the loss of power in car number 14 and get prepared for Fuji."