I have and interesting problem. As some might be aware, I am running S4 M-box file on my allroad and I encountered an interesting issue with the file.

When ECU logging (or accessing VAG-COM blocks), the vehicle speed is off since it is calculated for a different rolling diameter tire than what my car really drives on.

I assume that ECU is calculating current vehicle speed off some signal from ABS module. The signal interval is transformed into actual vehicle speed by using some formula with a constant for tire size.

My question is: Anybody knows what the constant is called and maybe even knows what offset is it at in M-Box file?

thanks! added to new map pack here

http://www.nefariousmotorsports.com/forum/index.php/topic,200.msg4966.html#msg4966