From my past experiences the cops must lock onto the speeding car for three seconds, and that gives them the speed u are doing.It doesnt have a pic of your car or anythng, its just the moving object he is pointing at. In reality the cop was only doing his job wasnt he.. u were 52kms over the speed limit and i know that is easy to do in a skyline.
Do u travel that motoway alot ?? i drive the F3 everyday for work for the last 5-6 years, u get to know where the cops can sit and where they cant.. that can help u in choosing the spots where u want to give it a bit, but then when u least expect it they will sit somewhere new.
The road rules are there for a reason, it keeps everyone safe. u took the chance and broke that rule.