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Old 08-31-2009, 11:32 PM   #1 (permalink)
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Default Speedometer calibration

The speedometer on my FXS, 07, is out by far. Compared to GPS speed, I'm out by more than 10KM/h (6.2MPH) Is there a way to calibrate it, so that it is more accurate? I know they always set speedometers to be optimistic, but this is ridiculous! I did a high speed test recently and saw 220KM/h (136MPH) on the clock, but GPS true speed was only about 198KM/h (123MPH). This means it gets progressively worse, the higher the speed! It does however not get lower than 10KM/h, so 60KM/h is 50, and so on.
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Old 08-31-2009, 11:52 PM   #2 (permalink)
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On my 09, repositioning the needle one "click" round on the shaft has made the speedo within 2mph from 30 up. Just below the stop when zero and a touch low at 20 but that's OK for me.
You could go up a tyre size next change too, if you fancy. That'd be a linear change tho.
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Old 09-01-2009, 12:01 AM   #3 (permalink)
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On my 09, repositioning the needle one "click" round on the shaft has made the speedo within 2mph from 30 up. Just below the stop when zero and a touch low at 20 but that's OK for me.
You could go up a tyre size next change too, if you fancy. That'd be a linear change tho.
Tyre change is not an option, as the higher profile tyre does not fit in the spare wheel well! Also you cannot use tyres of different sizes on the same axle, due to serious damage caused to gearbox. Is the needle easily accessible? Does the cluster remove easily?
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Old 09-01-2009, 02:55 AM   #4 (permalink)
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I eventually found the speed indicator in the OE SatNav, so on a recent run back from Tyneside did the comparison. Over-reading by 5mph (8kph) between 60-70mph, and that's on relatively new tyres. And as they wear down it will only worsen

Do we know what effect this magnitude of error has on the odometer


David, I'll take your instructions for the 'Needle' reposition, usual commission.


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Old 09-01-2009, 04:24 AM   #5 (permalink)
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I eventually found the speed indicator in the OE SatNav, so on a recent run back from Tyneside did the comparison. Over-reading by 5mph (8kph) between 60-70mph, and that's on relatively new tyres. And as they wear down it will only worsen

Do we know what effect this magnitude of error has on the odometer


David, I'll take your instructions for the 'Needle' reposition, usual commission.


Mike.
It stands to reason that if the speed is out by 17-18%, the odometer is probably also out by that margin, right? Bigger wheels would be the answer, but like I said before, I tried 65 series tyres, which were fine, except for the fact that they do not fit in the spare wheel well! If someone can take pics of the needle bending / rotating fix and post them, I would be grateful and I sure many others would too!
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Old 09-01-2009, 07:01 AM   #6 (permalink)
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If the speed pickup is electronic, ask your dealer is they can change it by reprogramming the computer. On the Dodge pickup trucks, its an easy program change and many chip programmers have this feature.
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Old 09-01-2009, 08:51 AM   #7 (permalink)
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Mike, I found that the needle didn't pull off easily; but when I tried twisting it miraculously jumped gear a tooth on the stepper motor. The needle sits just below the zero point when off, a small price to pay for the accuracy elsewhere.
If memory serves, on the 09 you remove the knee panel first, then the instrument visor can pull off. the lens just unclips from the cluster then.
There might be some screws in that sequence, can't recall.
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Old 09-01-2009, 11:02 PM   #8 (permalink)
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I'm a bit loathe to start disassembling my instrument cluster and forcing the speedometer needle to jump a gear! With my luck, I'll break something! Does anyone know if the speedo on the 07 is electronic, or mechanical?
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