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​SPEEDOMETER READING WRONG

Problem - My speedometer is reading wrong. Why?

Possibility 1 - All vehicles from factory have a percentage of error to meet transport authority regulations. The regulation is 10% either way but more vehicles seem to be under than over. 

There are many reasons why the speedometer reading is off. Tyres of a different size or with different air pressure than what was on the vehicle when the speedometer was originally calibrated or the manufacturer deliberately calibrating the speedometer to 10% more or less. GPS speedometers can be inaccurate if you can't get a clear signal from the satellites.

A speedometer that is not accurate should be re-calibrated. This process should be done by a qualified mechanic. A mechanical speedometer is re-calibrated by using gears with different numbers of teeth to get a more accurate reading. In electronic speedometers, the vehicle is re-calibrated  using the vehicle's computer and a scan tool.
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  • Urus
  • Huracan
  • Aventador
  • Gallardo
  • Murcielago
  • Diablo
  • LM002
  • Jalpa/Silh.
  • Countach
  • URRACO
  • JARAMA
  • ISLERO
  • Espada
  • MIURA
  • 350 400 GT