2007-02-10 08:07:10 · 4 answers · asked by uzo o 1 in Cars & Transportation ➔ Car Makes ➔ Lexus
Maybe you're not reading it correctly.
2007-02-10 08:15:11 · answer #1 · answered by Josh F. 2 · 0⤊ 0⤋
How are you confirming that you're going 120km? Radar gun? Sat Nav? In any event, the most likely cause for such a disparate reading would be incorrectly sized tires. Whenever you change the "aspect ratio" you affect the speedometer reading. For example, if your car came equipped with 225/75/15 tires (225 = width, 75 = aspect ratio which means the height is 75% of the width, 15 = rim diameter) and you now have 225/60/15's the rotation will be vastly different because the dimensions are so far off. Going up in rim size can also affect readings, as can tire width (again, because it will affect the aspect ratio).
Check out http://www.discounttire.com for more info on aspect ratio.
Check your owner's manual for the stock tire sizing (ie. 225/70/15 for example) and then check the size of the tires currently installed. Then check both against the source I posted for more info.
2007-02-10 16:16:47 · answer #2 · answered by Paul P 3 · 0⤊ 0⤋
That is probably the speed regulator, either it was set too low or your seedometer is just messed up. Go to the dealer and get more info.
2007-02-10 18:06:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋
If it's a digital gauge, then maybe it has switched from KM to MPH. Has the mileage on the odometer also reduced?
2007-02-10 21:45:50 · answer #4 · answered by wheeler 5 · 0⤊ 0⤋