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Hey guys hoping somebody on here can fill me in on capabilities of the dealer software:

Can you adjust the wheel size/speedometer pulse count in the computer?

I have owners manual sized tires and the speedometer is WAY off, to the tune of 5mph fast. The speed doesn'tbother me so much as the odometer being way out of proportion to actual miles driven.

I am also considering going away form the stock size tires so this would be extremely helpful for that.


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It is not possible to calibrate this in the DME.

The speed is typically registered as 4-5MPH faster due to the German "speedometer advance" law.

This law prohibits manufacturers from reporting speeds that are ever lower than the actual speed.

Also on most NA narrow body cars, I don't recommend 19" rims if you've lowered the car due to bottom/out rub issues.

Edited by logray
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  • 2 weeks later...

Also on most NA narrow body cars, I don't recommend 19" rims if you've lowered the car due to bottom/out rub issues.

I will keep that in mind...though thats not why I was asking?

I don't expect the speedometer to be dead nuts on, but it is rather far off. My 2002 BMW is almost right on, so that is what I am used to.

Pity that you cannot adjust it easily. (there is always a way!)

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