View Single Post
Old 12-18-2016, 02:50 PM   #2 (permalink)
t vago
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Hungary
Posts: 1,774

iNXS - '10 Opel Zafira 111 Anniversary

Suzi - '02 Suzuki Swift GL
Thanks: 805
Thanked 687 Times in 440 Posts
Yah, I set the number of bits for the VSS pulses/mile count to 16. That results in a maximum value of 65535. That is part of the issue you're seeing.

The other part is that the MPGuino code currently cannot handle raw VSS pulse frequencies higher than about 187 Hz. In contrast, using a tire size of 225/45R17 (which I think is the stock tire size of your Mercedes), and a VSS pulse/mile setting of 166770 pulses/mile, I have calculated that your VSS is sending a raw VSS frequency of about 926 Hz to your MPGuino.

I think I have found a way to beat this within the MPGuino code, and allow your speedo to output the correct speed, but I will need your help to verify whether this fix will actually work.
  Reply With Quote