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Thread: Logging Speed MPH stops increasing at 158 and I can't figure out why

  1. #11
    Joe (Moderator) joecar's Avatar
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    I knew I had seen this before, I just couldn't find it... lol, a ten year old thread.

  2. #12
    Lifetime Member Tre-Cool's Avatar
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    Yeah i had to do a similar thing when i was doing some 1km race events. I can't remember the exact math but it had something to do with rpm vs gear ratio & tyre diameter.


  3. #13
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    Quote Originally Posted by GMPX View Post
    Some of the E38 and E67 vehicles may support these two:
    E38.VSS_DMA
    E67.VSS_DMA

    That will go all the way up to 255 MPH.

    Cheers,
    Ross
    Has anyone confirmed the E38.VSS_DMA works on the E38? (2010 Camaro SS here with an E38)

  4. #14
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    Quote Originally Posted by Tre-Cool View Post
    Yeah i had to do a similar thing when i was doing some 1km race events. I can't remember the exact math but it had something to do with rpm vs gear ratio & tyre diameter.

    How were you able to log gear position? Auto or manual tranny? (looking for manual in a 2010 Camaro, TR6060)

  5. #15
    Lifetime Member minytrker's Avatar
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    I never got around to do this so I could log mph higher than 158 but now that we are getting well into the 200+ I should like to log my actual mph. Have a 2006 and 2008 C6Z06 (E38) both manuals with different trans ratios and rear end ratios.

  6. #16
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Blue70SS View Post
    How were you able to log gear position? Auto or manual tranny? (looking for manual in a 2010 Camaro, TR6060)
    The pid GM.GEAR works with the AT.

  7. #17
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by minytrker View Post
    I never got around to do this so I could log mph higher than 158 but now that we are getting well into the 200+ I should like to log my actual mph. Have a 2006 and 2008 C6Z06 (E38) both manuals with different trans ratios and rear end ratios.
    For the MT, you could write a calc pid that uses engine RPM, the axle ratio, and the gear ratio that you would be running in

    ( or have 6 calc pids, one for each gear ratio )



    from the other thread mentioned above:

    Quote Originally Posted by joecar View Post
    Hi Blue70SS,

    ...

    so for example (using say 6th gear):

    TR6060 6th = 0.63
    your rear axle = 3.25

    using engine RPM:
    gear_ratio = 3.25 * 0.63 = 2.0475
    road_speed[mph] = (engine_speed[rpm] * tire_diameter[inch]) / (2.0475 * 336)

    using have transmission output rpm:
    road_speed[mph] = (trans_output_speed[rpm] * tire_diameter[inch]) / (3.25 * 336)


    I don't know if there's a pid for the M6 trans output speed in RPM.
    I'm know (pretty sure) that the following pids work only for the AT's:
    - GM.TOS
    - GM.TIS
    - GM.GEAR
    - GM.BOXRATIO

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