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Title: Constant/MAP name for VSS conversion to speed? Post by: julex on May 04, 2011, 08:11:01 AM 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? Title: Re: Constant/MAP name for VSS conversion to speed? Post by: julex on May 04, 2011, 04:30:53 PM EDIT:
Finally found it... AIMVM Number of speed pulses per m for signal normalization v 0x12A56 2 bytes Finally my Allroad with S4 file shows correct speed in Vag-com/EcuX. It was off by 8% as much as Allroad's tires are larger from S4 (my size anyway) Title: Re: Constant/MAP name for VSS conversion to speed? Post by: nyet on May 12, 2011, 10:07:25 AM AIMVM Number of speed pulses per m for signal normalization v 0x12A56 2 bytes thanks! added to new map pack here http://www.nefariousmotorsports.com/forum/index.php/topic,200.msg4966.html#msg4966 Title: Re: Constant/MAP name for VSS conversion to speed? Post by: Eintopf on May 13, 2024, 01:20:44 PM Hi, i am looking for AIMVM for my rs4 b5 K-Box. Is it the same address?
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