Speedo Calibration Issue with BMW Speedo

[MartinGT40]

Hi

I am a newbie to the forum and would like to know if anybody can assist on the following problem I have. I run a Ford GT40 and successfully used a Video VBOx lite setup in the car with the default digital speedo. This measured the speed correctly. However, when I created a scene that used the VBox supplied "BMW_M_Speedo" (because it looks very similar to the one in the GT40), I now find that the speedo that is overlayed on the video displays the speed about 20mph below the real speed. The performance tools graphs confirm that the speedo that is overlaid onto the video is underreporting the true speed.

Both the GT40 speedo and the virtual BMW speedo go from 0 to 200mph. However, I have noticed that on the real GT40 speedo, twelve o clock corresponds to 100mph whereas on the BMW M Speedo it corresponds to 80mph. Further, whereas the increments are consistent for my GT40 speedo, on the BMW virtual speedo the increments change after 80mph with the second half of the speedo reading between 80mph and 200mph (i.e. 120mph range) in the same space as 0-80mph for the first half.

Has anyone else faced this issue using the supplied BMW virtual speedo? If so, how did you fix it?

Thanks, Martin :confused:

[Jonnie]

Hi Martin,

Welcome to the forum! :D

Can you send your scene file over to support@racelogic.co.uk. :thumbsup:

Regards,

Jonnie

[PencilGeek]

Hi

...

Both the GT40 speedo and the virtual BMW speedo go from 0 to 200mph. However, I have noticed that on the real GT40 speedo, twelve o clock corresponds to 100mph whereas on the BMW M Speedo it corresponds to 80mph. Further, whereas the increments are consistent for my GT40 speedo, on the BMW virtual speedo the increments change after 80mph with the second half of the speedo reading between 80mph and 200mph (i.e. 120mph range) in the same space as 0-80mph for the first half.

As you have noticed, the actual BMW speedometer is assymetric. 0-80 MPH uses one scale, and 80-200 MPH uses another scale. The vBox can't handle an assymetric gauge, that's why it must have the same scale all the way from 0 to 200 MPH. It looks like the gauge Racelogic created doesn't take this into account. I created my own symmetric BMW_M_SPEEDO nearly two years ago. I will be happy to send you a copy if you send me a PM.


Has anyone else faced this issue using the supplied BMW virtual speedo? If so, how did you fix it?

Thanks, Martin :confused:

I noticed the assymetric nature of the gauge and I confirmed with vBox-USA that vBox can't handle such an assymetric gauge design. That's why I created my own symmetric gauge. I'm a bit surprised Racelogic missed this on their version.