Weird obd speed issue

I am using RaceChrono 1.30 on a HTC Kaiser using windows mobile 6.5 beta. I have an OBDKey 1.30 that I am using to get obd2 data with. The OBD speed in MPH is approximately half the GPS speed (and the GPS speed is fairly accurate). I've included a couple of lines of data to show this -

Lap #,Timestamp (s),Distance (m),Distance (km),Locked satellites,Latitude (deg),Longitude (deg),Speed (m/s),Speed (kph),Speed (mph),Altitude (m),Bearing (deg),Longitudinal Acceleration (G),Lateral Acceleration (G),X-position (m),Y-position (m),RPM (rpm),Throttle Position (%),Trap name,OBD speed (mph)
N/A,48857.2,33.488,0.033488,3,33.0086933,-97.04729,2.78,10,6.21,173.91,133.06,0.06,0.1,-7.3,-20.02,1631.38,22.4,,2.66
N/A,48857.4,33.989,0.033989,3,33.0086917,-97.047285,3,10.82,6.72,173.91,134.23,0.12,-0.02,-6.84,-20.2,1648.47,22.35,,2.89
N/A,48857.6,34.359,0.034359,3,33.00869,-97.0472817,3.22,11.59,7.2,173.91,132.01,0.11,0.03,-6.53,-20.39,1682.64,22.35,,3.14

Comments

  • Hi the OBD speed units are actually meters per second. m/s is roughly 2 mph. The units on the header is wrong.
  • Cool thanks. I can massage the data as needed then
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