360 Speedometer Error -Is Yours Accurate - Ferrari Life
 
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post #1 of 15 Old 11-25-2012, 03:05 PM Thread Starter
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Speedometer Error -Is Yours Accurate

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.

Is this typical? Is there a way to correct it?

Regards,

Steve
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post #2 of 15 Old 11-25-2012, 08:12 PM
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Steve- Odometers are accurate, but speedometers are 5-10% high, normally.

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post #3 of 15 Old 11-25-2012, 08:28 PM
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Yup. My Silverado is the same.

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Last edited by Granucci; 11-26-2012 at 10:27 AM.
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post #4 of 15 Old 11-26-2012, 12:02 AM
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At least you made the boat guys day, amused me anyway..
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post #5 of 15 Old 11-27-2012, 07:57 AM
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pretty spot on...in fact, unless its more than 10% Ferrari will deem it within spec.
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post #6 of 15 Old 11-27-2012, 01:11 PM
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Plus side of our speedos? You are going 10MPH standing still....fast under any circumstance.

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post #7 of 15 Old 11-27-2012, 01:43 PM
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This is indeed normal Steve and on all cars. The gap is not a constant % but increases when speed is higher.
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post #8 of 15 Old 01-07-2013, 03:08 AM
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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.
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post #9 of 15 Old 01-07-2013, 05:36 AM
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...change of tire size can influence what the speedo reports,
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post #10 of 15 Old 01-07-2013, 11:01 AM
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Come to think of it, I've never actually looked at the speedo.
Too busy watching stuff whiz by....

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post #11 of 15 Old 01-07-2013, 01:23 PM
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Speedo on the F40 reads low by about 10kph at 200 kph vs the speed on the GPS.
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post #12 of 15 Old 01-08-2013, 08:46 AM
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Others on FChat have used the below speedometer calibrator with success. Wouldn't have a clue how to install it on a 360 however!

12oClockLabs

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post #13 of 15 Old 01-08-2013, 01:31 PM
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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
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post #14 of 15 Old 01-08-2013, 01:53 PM
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I have no idea how it could be installed on a 360. Somebody in the 308 Section did it a while ago and I stumbled upon it.

So can these be used to correct the speedo issue? How and where would one be hooked up? I don't know what a "Can Bus".
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post #15 of 15 Old 01-08-2013, 02:19 PM
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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.
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