360 How accurate is your speedometer?

Stock tires... reads 5-10 mph fast on the highway

 

Stock tyres, about 5 kph high at 100 kph

 

Ferrari speedometer readings have long been very generous. This makes it easy to say "I was doing 100MPH" at Cars & Coffee.

 

timely thread. I have a 430 and just last night used a gps iphone app and found my speedo to be almost dead on. I was surprised as I'm used to the "generous" buffer in most modern Porsches that overestimate speed just a bit on the speedo.

 

Off by 10% on high side.

 

Yup, my '99 with stock 18" wheels and correct tires reads about 10% high.

 

Funny thing—- on all my club drives I was last car to the next stop..... because I’m not willing to 100+ Off track... When all this time my Speedo has been off..

 

Reads way high, which means our cars have less miles on them then indicated

 

I always wondered about this. Depending on which wheels/tires I am using the speedo reads 5-8% faster.

 

My speedo also reads about 10% high. But I tested the mileage by mapping out a specific route on google maps (about 50 miles) and drove the route to find that the mileage was pretty spot on.

 

Speedos read high, but odometers are usually pretty accurate.

 

Yeah, my 360 varies from 10% to 12% high...my Porsche and Alfa Romeo both a constant 3mph high


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I think you will find the odometer will be correct. There would be regulatory issues if it wasn't.

My speedo is 10% high on stock tyres. Kind of annoying.

 

Even though the last reply to this is a month old as of today, I wanted to toss out my experience with my speedo. As long as I am accelerating at normal levels, mine is dead on (running Scud 285 19's). But, the minute I step into it, even to pass, it drops...the faster I go, the more it drops. Speedo has gone from 80ish down to 10ish while the car hits triple digits. Downshift....needle takes a nose dive like my 401k did in 2008. As soon as I come to a complete stop, it "resets" and is normal again....until I feel the need to exercise my right foot. (Bad stepper motor)