Stealth Enzo ...
 

On the french magazine "Sport Auto", i red an interresting article.
The police closed a motorway and clocked some fast cars with speed cameras. They measure a Porsche 996 Gt2 at 318 km/h but couldn't measure the speed of the Enzo, they used two differents speed cameras but no results and the policeman said they could not use a laser gun for this type of speed. It seems the pointed and low nose and shape + important speed are "guilty".
By checking the on board computer they achieved to get the max : 353 km/h. 8)
morals : If you want to make speed, take an Enzo and don't stop at 200 km/h you would be taken, push to 350 km/h ... :wink:
(Sorry, I haven't a scanner so I can't put it, but as it's in french, only a few would have understand)

Hmm, on-board speedometers aren't always accurate. That's why during road tests they use a radar gun to test top speed. But like you said, in this situation the radar gun couldn't clock it, either. :D

I thought they used GPS to clock top speed.

I think every mag has his own methods.. some still uses the laser pointed on the ground afaik

maybe they use performance timers like beltronics vector fx, or this are not acurrate?

GPS is the cheapest and most accurate speed measurement device :wink:

For this event, the magazine wasn't there to record the speed. It was the police that wanted to test their material under extremes conditions so thet used the radars like you can find on the board of te roads ...

I would just calibrate my eyeballs and guess the speed--isn't that more accurate?

yeah that issue was nice ! a stretch of highway closed for the soll purpose of speeding...:)

There is a digital speedo on the car which is accurate. They didnt take the reading from the analog gauge.

That still isn't necessarily accurate. I remember reading a TVR test recently and the GPS, digital readout, and analogue all had drastically different readings. The digital wasn't as drastic as the analogue, but it was still quite a bit off.

It is difficult to say wich is the best but your method is a math solution and to my opinion it is the best way (very accurate). Technology isn't always 100% sure.

I'd say GPS is the mist reliable solution on a cost vs compexity comparo. Sure, you could devise some clever solution that takes into account tire wear and everything and gives an accurate reading - or you could just go and buy a £499 Race Technology DL90. All the data you could possibly want for half a G.

I remember Topgear doing a feature somewhat like that, about which speed you'd need to outrun a speeding camera. They couldn't do it with a Mercedes CL55 @ 250 kph, but they did succeed using a TVR Tuscan S going around 270 kph...