Nissan Motorsports has ended its Sebring test this week due to a mechanical problem on its ground-breaking GT-R LM NISMO LMP1 contender.
Olivier Pla and Marc Gene had completed somewhere in the region of 70 laps on Monday and Tuesday but the team took the decision to head back to its base after an unspecified failure of a component believed to be within the engine installation.
Motorsport.com sources have also discovered that the rear gearbox and the flybrid system have also given the team significant headaches in recent weeks.
Sources indicate the car was over ten seconds shy of the 2015 spec Audi R18 e-tron quattro, which is also at the test.
However, it is known that Nissan were not running its front-axle connected rear hybrid system over the first two days.
The lack of running for Jann Mardenborough, Harry Tincknell and new recruit Max Chilton, who all arrived at the track yesterday scheduled to drive, will be especially disappointing for the team as it is believed that the unique characteristics of the car are proving especially difficult to learn.
Nissan will be investigating testing opportunities ahead of the official Prologue test in three weeks' time. It has entered one of the GT-R LM NISMO cars at the two day Paul Ricard test.