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Today I also viewed my speedo and odometer after several people saying its off by approx 10%. I noted that in fact my oldometer IS OFF by approx 10% when testing against the hiway state mile markers every mile. I did it for 10 miles and found at the end my odometer stated I had gone 10.9 miles.

I am not that concerned about, just pissed because I think this means when I have hit 192 on my MPH in Eastern Oregon, (once only) was I realy only doing 173, and does this mean that the Mercy IS NOT a 200MPH super car?

Anything new on this from anyone?
 

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I am going to try fixing this issue. While it does not seem like anything huge, keep in mind that when your odometer reads 10,000 miles you have probably driven only slightly over 9k miles. It definitely adds up over time. I am not as concerned with the speedometer as I am with the odometer.

I am surprised to find that no one else (other than me) noticed this. Everytime I am on the highway, my speedo is between 80-90mph just to keep up with traffic going 70-80mph.

Has anyone else figured out a solution? I'd rather not re-invent the wheel if I don't need to.
-W
 

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I haven't noticed whether mine is accurate or not mostly because my 2002 still reads in KM's. Are both of yours displayed in miles?

Sounds like a great question for your selling or servicing dealer. At the rate these depreciate with milage - 9 or 10K miles will make a difference when you try to sell.
 

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I bring this thread back to life because I found mine to be reading nearly 10 mph faster per GPS at 80 mph yesterday; this on a new gal

Shadowman
 

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I have an 09' Nissan Altima and the whole on board display that tells me the mileage and gas consumption etc. kept be pretty excited when I first got it. I then began thinking that all those calculations come off of 3 basic things...

Speed, distance, and time.

Once the computer collects those numbers (sometimes within a set interval for some calculations), it can start determining the cumulative time the engine has been on, the total distance traveled, current gas mileage, overall gas mileage, average speed, etc.

I'm not sure whether a Lambo has this type of on board calculations in some menu, but assuming so, all those would be off also.


As for how to actually test it, could you not have another car drive along side you to state the speed?
 

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I have an 09' Nissan Altima and the whole on board display that tells me the mileage and gas consumption etc. kept be pretty excited when I first got it. I then began thinking that all those calculations come off of 3 basic things...

Speed, distance, and time.

Once the computer collects those numbers (sometimes within a set interval for some calculations), it can start determining the cumulative time the engine has been on, the total distance traveled, current gas mileage, overall gas mileage, average speed, etc.

I'm not sure whether a Lambo has this type of on board calculations in some menu, but assuming so, all those would be off also.


As for how to actually test it, could you not have another car drive along side you to state the speed?
Thank you for your comments

It was IMO verified as off by comparing the physical speedometer to the on board GPS as well as a hand held GPS; both of the GPS units read the same.

All the best

Shadowman
 

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Sorry, I know what I said wasn't at all helpful... but I looked around the internet, and apparently a common reason for this happening is when you change the wheel size. Although I'm guessing they're the same as the stock ones.

The vehicle speed sensor (VSS) is probably skewed and could need recalibrating? Not exactly sure.... maybe Roy can let you know what he did.
 

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Sorry, I know what I said wasn't at all helpful... but I looked around the internet, and apparently a common reason for this happening is when you change the wheel size. Although I'm guessing they're the same as the stock ones.

The vehicle speed sensor (VSS) is probably skewed and could need recalibrating? Not exactly sure.... maybe Roy can let you know what he did.
You tried and for this I thank you

All the best

Shadowman
 

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This thread is 5 years old!!! And very old news. Let it die.

Everyone with a G has this problem of speedo being 10% off, and there is no fix.....factory likes it that way...

Hey, it's the Italian way!
 

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This thread is 5 years old!!! And very old news. Let it die.

Everyone with a G has this problem of speedo being 10% off, and there is no fix.....factory likes it that way...

Hey, it's the Italian way!
“Let it die”; now this is an interesting comment to make; I would consider this an acquiescent comment

In this case it has to do with a LP670-4 SV and yet between all models the situation may “still” exist nonetheless asking the question hoping that after numerous years just maybe it would have changed or a tweak made available is not akin to waking the dead.

I respectfully say that if the thread was of no interest/value to you then surf right on past it however I expect the same respect from you in my being able to ask a simple question.

Takes care

Shadowman
 

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> Today I also viewed my speedo and odometer after several people saying
> its off by approx 10%. I noted that in fact my oldometer IS OFF by approx
> 10% when testing against the hiway state mile markers every mile. I did it
> for 10 miles and found at the end my odometer stated I had gone 10.9 miles.
>
>
> I am not that concerned about, just pissed because I think this means when
> I have hit 192 on my MPH in Eastern Oregon, (once only) was I realy only
> doing 173, and does this mean that the Mercy IS NOT a 200MPH super car?
>
> Anything new on this from anyone?

In a Gallardo with Nav you can compare your speedometer against GPS as
follows. Enter "enhanced mode" of Audi's RNS-E unit: push NAV, then push
and hold the upper left button for 5 seconds, and finally push and hold the
upper right button for 5 seconds. (I am referring to the buttons around the
main dial knob, *not* the left/rev and right/fwd buttons above, which you
would use to pick the prev/next song from CD or SD.)

In enhanced mode you will see white background with blue "buttons" which
you can press with the main dial knob, as usual. Under the nav menu there
is one screen which shows your current GPS speed in km/h and mph. Enjoy
comparing that to your analog speedometer.

Supposedly you can push and hold the right/fwd button for a few seconds to
take screen shots, after you enabled screen shot mode. I was too lazy to get
my SD card out last night -- so I'm not sure yet whether that worked. :)

Oh, and yeah, the rear view camera won't take precedence when you are in
"enhanced mode" -- so you might want to back out first. As always, do keep
it safe. Consider enlisting the help of a passenger.

Enjoy!
 

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Has anyone found a fix for this speedo problem? I was out for a drive today and noticed mine is also out 10-15 kph higher. There is a speedo shop in the city that I am going to take my G into to see if they can fix it.
 

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