This could be caused by a larger or smaller diameter wheel/tire combination being used than the car originally had.
Could also be caused by the speedo being out of calibration itself and/or the speedo cable being stretched.
instantaneous speed. =)
The speed should read fine with a GM speedometer, as the 110 and 150 are calibrated to go into the same cars with the same transmissions.
check if it has a speedometer cable if not the speed sensor needs to be replaced
On the speedometer, no. It will indicate a speed but it will not be accurate.
The top speed is 128mph (2006 EX sedan). The speedometer would probably read 130. I drove it at 202 Kmp/h
In a car, the speedometer measured Instantaneous speed. This comes from the assumption that the car does not slow down and speed up fast enough for the speedometer to be able to give an average of the changing speed.
It reads the instantaneous speed.If you have noticed that the speedometer needle drops and rises with the drop and rise with the cars speed.
It measures the actual speed of the car at the time
The average speed of the vehicle relative to the road.
A car has a speedometer. When you read the speed that it indicates, and you know the direction in which you're driving, then you know the car's velocity.
The speed you are travelling measured in miles per hour, or kilometers per hour, depending on where you live.
Your alignment on the speedometer cable is off. This happens a lot on older Geos. Take it to a mechanic and have them speed test it and re fit it.
Larger tires will make the speedo lower than actual speed.
The speedometer in a car runs based off the speed of the transmission. The gears in the transmission spin at a known rate for the speed the vehicle is traveling at. The faster the gears spin the more the speedometer goes up. If a person replaces stock tires with larger tires, then the tires will spin slower, which will cause the speedometer to read at a value that is less than the actual speed.
VSS ( Vehical Speed Sensor ) located on your transmission
Speed sensor...on the passenger side of the tranny where the axle enters the transmission.
read the code on the obd ,its more than likely the speed sensor,,,,thats gone out
Get somebody to read the codes. there is a speed sensor that has to be replace in your vehicle and that is why the servie engine soon light come on because it is aware of the problem when the speed is jumping around.
Speedometers are not allowed by law to under-read, but are allowed to over-read by no more than 10%. So at a true 30mph, they can legally read anything between 30mph and 33mph. Because they read the speed via a sensor in the transmission, not the true speed of the vehicle across the ground, they have to be calibrated such that they under-read slightly when the vehicle is lightly laden and has brand new tyres fully inflated. As the tyres wear, and if they are slightly under-inflated, or compressed by a greater load in the vehicle, the speedometer will over-read by more.
If during that entire period of time the speedometer read 60, then the speed was constant in your relative inertial reference frame
I'am not sure about your vehicle, but most have a cable that runs from your speedometer to the transmission. speed is read by a gear that spins the cable. most of the time the cable is simply broken and is pretty easy to replace. if you have a digital speedometer it is usually a simple two wire cord that runs from the side of trasnsmission to speedometer. either way speed is read off the transmission on my 93 f-150 the speedometer sensor is on the third member of the rear end. I have a 1995 F150 5.8 auto 4x4. My speed sensor is on the tail shaft of the transfer case.
The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.