But little, apart from standard tyres and a dryer surface, was known about the reason behind the increase in pace, from its first recorded run of 7 mins 38 secs. Until now.
According to PistonHeads, even though it was said to be unmodified, there were a few tweaks which are set to debut on its European launch.
Nissan is said to be including harder engine mounts and a stiffer transaxle mount for the US version, allowing for more suspension tuning, and the Euro version will include a recalibrated rear differential, and revised steering. Sign off on these ammendments will be in September.
But if the diff and steering settings have netted an increase of nine seconds on the world's most challenging circuit, there's little doubt that the GT-R will gain these tweaks at production.
Chief engineer Kazutoshi Mizuno explained why there will be changes, even after the GT-R's launch in Japan.
"The GT-R is my son," he said. "A son grows up and it's my duty as father to keep improving it."