Went for long drive today with my wife. By the way she loves the car but is so gentle with car. We got passed by pickup pulling a boat. But I digress.
Had my Garmin GPS unit with me to compare the Ferrari speedo to the GPS. At 80 mph indicated on car speedo, the true speed was about 75mph. There seems to be about a 6% error thru the entire range I was driving at. This is similar to our BMW which also consistently gave indicated speeds higher than true speeds.
Glad I found this thread...
Bisel I had the same issue when I went for a ride today.
True speed was 63/64 showing 71 approx a 10% error
What I have noted and others have mentioned, at lower speed the inaccuracy is less, my true speed was 30 and showing 32.
Perhaps the % error stays the same but absolute number increases.
Interesting finding Rob. I had a look to this product which seems only for motorbikes as per their shop. But the principle is interesting. Now to make this working on the 360, there would be still a way to go as the speed data comes from the Can Bus and is directly used by the instrument panel. The question is, is it worth knowing that the 360/430 speedos are scaled in such a way that you can read only the speed by 15 km/h steps. Anything between is just impossible to read when driving
Since the 360, the speedo is no more using a pulsed speed signal but data coming from the internal Can Bus. That's why you won't be able to hook up this device on your car. Older cars like the 308/328/348 uses directly a pulsed signal and that's why this correction device can be easily installed.