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My 2.2¢...
The rules alow a tolerance but don't allow a speedo to under-read. So, at a real 100km/h the speedo reads somewhere between 100-114km/h (i.e. an error band of 14km/h). It makes sense to me that they've aimed somewhere in the middle (i.e. 107km/h or so) to allow for tyre wear, electronic tolerances, drift with age etc. You can reduce the error in the speedo by fitting a larger wheel/tyre combination but in doing so you'll increase the error in the odometer which records close to true distance.
If your car has RNS-510 you can access the uncorrected speed through it. Also, you can get it through the average speed readout from the trip computer (trip computer avg. speed is uncorrected too).
Most of Europe's cars are built to the same standard so it's reasonable to expect that in the interest of rule harmonisation that we follow (it's what we signed up for in 2000 after all) which has hopefully meant cheaper cars...
- Anthony
The rules alow a tolerance but don't allow a speedo to under-read. So, at a real 100km/h the speedo reads somewhere between 100-114km/h (i.e. an error band of 14km/h). It makes sense to me that they've aimed somewhere in the middle (i.e. 107km/h or so) to allow for tyre wear, electronic tolerances, drift with age etc. You can reduce the error in the speedo by fitting a larger wheel/tyre combination but in doing so you'll increase the error in the odometer which records close to true distance.
If your car has RNS-510 you can access the uncorrected speed through it. Also, you can get it through the average speed readout from the trip computer (trip computer avg. speed is uncorrected too).
Most of Europe's cars are built to the same standard so it's reasonable to expect that in the interest of rule harmonisation that we follow (it's what we signed up for in 2000 after all) which has hopefully meant cheaper cars...
- Anthony
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