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Nairaland Forum / Nairaland / General / Car Talk / Speedometer Readings...are They The Same? (3437 Views)
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Speedometer Readings...are They The Same? by Originalsly: 10:53pm On Apr 26, 2013 |
80kph/50mph is what it is ....but when it comes to speedometer readings why does it vary so much in trucks, cars made for the North American market and cars made for the Japanese market? eg..if a Toyota Corolla from the US and one from Japan are both clocking 100...the one from the US would actually be pretty much driving faster. Am I wrong? If not why is this so? |
Re: Speedometer Readings...are They The Same? by Nobody: 11:17pm On Apr 26, 2013 |
There are variations, not based upon the country they're sold in, speedo's tend to over-read. These are deliberate error margins built into the automobile. So we have actual speed, and indicated speed. For example, When the speedo's indicating 70 mph, the actual speed is between 63 and 66 mph. The error margin increases the faster the automobile travels. So the error margin is smaller at 20 mph and greater at 155. Fitting different size wheels will alter the error margin, either + or -, depending if the replacement wheels are smaller or larger than the factory offerings. |
Re: Speedometer Readings...are They The Same? by sultaan(m): 12:18am On Apr 27, 2013 |
Originalsly: 80kph/50mph is what it is ....but when it comes to speedometer readings why does it vary so much in trucks, cars made for the North American market and cars made for the Japanese market? eg..if a Toyota Corolla from the US and one from Japan are both clocking 100...the one from the US would actually be pretty much driving faster. Am I wrong? If not why is this so? Because 1.6km=1mile So 160km/h = 100mph 100km/h = 60mph |
Re: Speedometer Readings...are They The Same? by yungboss(m): 5:27am On Apr 27, 2013 |
Siena: There are variations, not based upon the country they're sold in, speedo's tend to over-read. These are deliberate error margins built into the automobile.I dnt know how true the GPS is, i've actually checked my speed at 140km/h and 160km/h using the cruise control setting of my car. It was exactly the same as the GPS numbers measured...i think there's a level of accuracy with the speedo... |
Re: Speedometer Readings...are They The Same? by Originalsly: 6:22am On Apr 27, 2013 |
@Siena...I hear you on the margin of error and if the wheel size is changed. But my confusion is with the indicated speed....brand new car...Toyota Corolla... from the North American market and brand new Toyota Corolla from the Japanese market...if driven side by side at the same indicated speed the NA version would be travelling faster. I am now thinking the NA cars have larger wheels. |
Re: Speedometer Readings...are They The Same? by Nobody: 2:09pm On Apr 27, 2013 |
yungboss: Legislation decrees error margins are built into production automobile. Larger wheels will bring the actual and indicated speed closer. No production car indicated speed will tally with actual speed all through the speed range, from 10 - 155 mph. |
Re: Speedometer Readings...are They The Same? by Nobody: 2:11pm On Apr 27, 2013 |
Originalsly: @Siena...I hear you on the margin of error and if the wheel size is changed. But my confusion is with the indicated speed....brand new car...Toyota Corolla... from the North American market and brand new Toyota Corolla from the Japanese market...if driven side by side at the same indicated speed the NA version would be travelling faster. I am now thinking the NA cars have larger wheels. Depends on the scale you're reading - km/h or mph. |
Re: Speedometer Readings...are They The Same? by Nobody: 10:39pm On Apr 27, 2013 |
Most speedometers have tolerances of some ±10%, mainly due to variations in tire diameter. Sources of error due to tire diameter variations are wear, temperature, pressure, vehicle load, and nominal tire size. Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle, to ensure they are not liable for drivers violating speed limits. Excessive speedometer error after manufacture can come from several causes but most commonly is due to nonstandard tire diameter. European Union member states must also grant type approval to vehicles meeting similar EU standards. The ones covering speedometers. are similar to the UNECE regulation in that they specify that: The indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading. The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. For example, at 80km/h, the indicated speed must be no more than 92km/h. Source:en.m.wikipedia.org/wiki/Speedometer |
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