What are you guys using to measure speeds once there?
Even calculating by RPM will be off at that point. I know mine is off by about 400 RPM once I go above 7k RPM.
Anyone use a GPS? I personally have gone to a maximum of 195 km/h (or 121 mph) as per my GPS, but that was all the circuit would allow me to go to (the VE still had lots of acceleration in it), and the speedo was displaying more (but has no memory, so that was just me taking a glimpse before hitting the brakes). Perhaps I am getting old, but I would never go any close to that on public roads
Oh, and even at 120, the car felt unstable as hell and was somewhat "jumping" up and down, but that was because I was picking up rubber on the track with the race tires