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Speedo problems kind of

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Ger Keane

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hey, does anyone that has an external speedo aswell as the one on the dash notice a difference between them? my car is limited to 180k but the speedo on the dash goes well past the 180 mark before the limiter kicks in. the external speedo i have on the dash reads 179/180/181 when the lim iter kicks in. anyone know why the standard dash speedo is off? could it be because of runnin 17" wheels instead of standard 15"
 
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stock speedo's always read wrong, just so that you're not right on the speeding limits.

wheel/tyre combination can cause the speedo to be thrown out more.

mine with 17"s is about 6mph out at higher speeds, that's tested with GPS.
 
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