VMSpc 9% higher than speedometer/Radar

VMSpc 9% higher than speedometer/Radar, how do I correct?

You can go to

You can go to Advanced...Engine correction...change the Odometer from 1 to 0.01
If that changes it too much up the 0.01 number some.

To compensate for this kind of error you can enter correction values in the Engine Corrections dialog box. For the odometer, hourmeter, and fuelmeter you can enter both an “Offset” and a “Multiplier”. VMSpc will automatically add the Offset to the indicated meter, then
Multiply the result by the multiplier. In addition, the multiplier will be applied as appropriate to the Speed, Cruise Speed, MPG, Fuel Rate, and Rolling MPG gauges.

For example, if your engine was reprogrammed and lost its history at the 20,000 mile mark, and you added tires that cause it to understate the speed by 5%, change the Odometer Multiplier to 1.05. Change the Offset to 19,408. (Remember that the Offset is added, then the Multiplier is applied. 19,408 * 1.05 = 20,000.)

Larry

RE:VMSpc 9% higher than speedometer/Radar

Thanks Biker1956,
So,if your engine was reprogrammed and lost its history at the 19,000 mile mark, and you added tires that cause it to OVERstate the speed by 5%, would you change the Odometer Multiplier to 0.95? Change the Offset to 20,000 * 0.95 = 19,000?

I think you got that right.

I think you got that right. In the Engine corrections. The Odometer reading at the top should be your total Odometer reading miles. After you change the Multiplier and click OK, then open it back up, the Odometer total should have changed to what your dash Odometer says if you used the right number in the Multiplier.

Larry