When the speedometer in my 575 registers 60 MPH, my GPS says I'm only going 55 MPH. At 80 MPH, the GPS says 75MPH. Do they all do that? Do I need to check tire size? Any reasonable way to correct it? Thanks! David
Mine is exactly the same and also about a 5mph difference. No need to adjust, just think of it as a little speeding ticket buffer.
Usually between 5% and 10% fast and that has been true of all my Ferraris dating back 45 years or so.
You do and you should enjoy it in good health! I have put over 50,000 miles on mine (was driving it over the weekend actually) and apart from new shocks and a throw out bearing replacement it drives better than the day I bought it. Probably the best grand tourer of the front engine V12s. Much more of a GT car than F12 and 812 which I have also owned but sold. This ones’s a keeper.
so does that mean the actual mileage on the vehicle is overstated by 5% to 10%.....since the speedo is shall we say optimistic LOL
No, the odometers seem to be pretty accurate. You can check yours against the mile (kilometer) markers on the highways.
tdf is such a nice colour Mark.....less conspicuous as well... what colors were the modern v12's you sold ?
My 30,000 mile F12 was Grigio titanio and the 812 was also Tdf. On the 812 I was “asked” by the dealer if I would like to sell it. Image Unavailable, Please Login Image Unavailable, Please Login
I installed a redarc (humming bird) gps speed pulse generator. Basically cut the speed pulse wire that comes from the factory speed pulse module in the gearbox to the speedo. Installed the GPS module onto the speedo side. The speedo now gets its speed pulse from a gps signal. Works perfectly and is super accurate regardless of tyre size etc
It would seem so. Twenty years ago I drove a 328 Ferrari that was 8% too optimistic with speed. Speedometer showed 65 mph when it was doing 60. So I decided to use hwy mileage markers to see what the odometer would register. After 10 miles, the odometer registered 10.8 miles. So I think the test was pretty accurate. I mean after ten miles, to have such a discrepancy must indicate a fault with the odometer that reads 8% more miles than the car actually covered. That's a big difference. A 550 I drove in 2003 in Europe only had a 1-2% error at most according to km markers. Sent from my iPhone using FerrariChat.com mobile app
The speedometer on my 550 is so bad I use a GPS speed app on my iPhone if I need to watch my speed on the freeway. Sometimes the speedo reads 60 when I'm going 40, other times it's only off a little. I'm intrigued by this use of a GPS pulse module. More details on what to get and how to install? Or is there a way to repair the speed sensor on the gearbox?
I may depend on the gear - I was once caught by a speed camera (which I unfortunately trust) at 76 kph with the speedo telling 80 kph - I remember it because after the the 5 kph legal tolerance I was fined for driving at 71 kph in a 70 kph zone ... (it was with my 550 back then)
Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Very simple installation basically just power and earth. Cut the speed pulse wire at the back of the speedo and connect the humming bird wire. Instructions attached
Adrian, we have speed cameras in tunnels, here in Sydney. GPS doesn't work in tunnels. There are radio station repeaters. Not sure about GPS repeaters. 5% sounds reasonable. 10%? Speedos can be recalibrated (if it's still the electro-mechanical type). With 550's, you get vehicle speed from one of the rear wheel sensors. There may be a faint possibility that the sensor is not be picking up the wheelspeed correctly.
