Phil - thats got to be theoretical top speed.
Once you bring air resistance into the equation it won't add up.
I've run my Aero several times at bruntingthorpe on the 2 mile straight through professionalyl calibrated laser traps to assess top speed. The official top speed for the (s1) car is 160, but even in tip top fettle with a tailwind, the car would barely manage 150mph through the laser traps - and thats hitting the main straight (not sideways) at around 70-80mph around the bottom bend, not from a standstill.
Daft question but did you have the hood up or down? We know from the GT3 experience that the roof has a major aerodynamic influence?
