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Thread: Speedo Recalc for New Tire Size

  1. #1
    Junior Member CVs06Tahr's Avatar
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    Default Speedo Recalc for New Tire Size

    Just bought new tires and wheels for my 06 GTO and wanted to adjust my speedo settings to be more accurate because of the change. However, when I first went in to the Speeo Calculator I started off by entering my OEM tires into the calculator and the results were not even close to the OEM values in the tables. For example, for my stock 245/45/17 wheels (corrected tire size 3/1/07 @ 10:07 pm MST -- was 245/25/17):

    Param: -> OEM Val -> Calc Value
    H0101 -> 11792 -> 67536
    H0104 -> 312 -> 1688.39 (the calculator inserts 636 here when apply is pressed)
    H0136 -> 503 -> 487.98 (nothing happens here when apply is pressed)
    H0139 -> 2540 -> 2049.26 (nothing happens here when apply is pressed)

    Before I go entering the data for my new tires/wheels and really mess things up. I'd like to understand what's going on.

    Any thoughts?
    Last edited by CVs06Tahr; March 1st, 2008 at 05:08 PM.
    2006 GTO, LS2, M6, EFILive Tune, Kooks 1-7/8" Signature Series Headers w/High flow cats, Corsa Sport Cat-backs, Ruff R930 18x8.5(Rt) 19x9.5 (Rr), BFG g-Sport 245/35VR-18 (Ft), 265/30VR-19 (Rr)

  2. #2
    EFILive Developer Site Admin Blacky's Avatar
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    Please send the *.tun file to me at paul@efilive.com and I'll take a look.
    Add a reference to this thread in the email so I know why I'm recieving the *.tun file.

    Regards
    Paul
    Before asking for help, please read this.

  3. #3
    Junior Member CVs06Tahr's Avatar
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    Quote Originally Posted by Blacky
    Please send the *.tun file to me at paul@efilive.com and I'll take a look.
    Add a reference to this thread in the email so I know why I'm recieving the *.tun file.

    Regards
    Paul
    E-Mail sent...
    2006 GTO, LS2, M6, EFILive Tune, Kooks 1-7/8" Signature Series Headers w/High flow cats, Corsa Sport Cat-backs, Ruff R930 18x8.5(Rt) 19x9.5 (Rr), BFG g-Sport 245/35VR-18 (Ft), 265/30VR-19 (Rr)

  4. #4
    Junior Member CVs06Tahr's Avatar
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    Quote Originally Posted by Blacky
    Please send the *.tun file to me at paul@efilive.com and I'll take a look.
    Add a reference to this thread in the email so I know why I'm recieving the *.tun file.

    Regards
    Paul
    Bump.

    Anything to report yet Paul?
    2006 GTO, LS2, M6, EFILive Tune, Kooks 1-7/8" Signature Series Headers w/High flow cats, Corsa Sport Cat-backs, Ruff R930 18x8.5(Rt) 19x9.5 (Rr), BFG g-Sport 245/35VR-18 (Ft), 265/30VR-19 (Rr)

  5. #5
    EFILive Developer Site Admin Blacky's Avatar
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    Quote Originally Posted by CVs06Tahr
    Bump.

    Anything to report yet Paul?
    Sorry, I meant to ask how many teeth on the speedo reluctor ring? It may not be 40 which is the default EFILive uses for manual transmissions. If it is not 40, then you will need to change the value in the speedo calculator. (Is it 10 or 11 teeth? Sorry I don't have that information at the moment)
    I have asked for the tooth count calibration to be added to the cal definition for that vehicle - for some reason it is missing.

    Also the trans output shaft revs/mile is rarely used on manual vehicles. On automatics it is used for calculating gear shift speeds. Sometimes it is not configured at the factory and a dummy/default value is left in there. You should allow EFILive to use the calculated value so that the speedo calculator can calculate the correct values.

    Regards
    Paul
    Before asking for help, please read this.

  6. #6
    EFILive Developer Site Admin Blacky's Avatar
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    It appears some values are not updated when the apply button is clicked. You should copy the values back manually until we can fix that.

    Regards
    Paul
    Before asking for help, please read this.

  7. #7
    EFILive Developer Site Admin Blacky's Avatar
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    Lastly, H0104 Trans Output Shaft Revs/Mile (Revs/Mile) appears to be limited to 1024 instead of the 4828 that is shown as the upper limit.

    Sorry for the last two issues, we'll get them fixed asap.

    Regards
    Paul
    Before asking for help, please read this.

  8. #8
    Junior Member CVs06Tahr's Avatar
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    Quote Originally Posted by Blacky
    Sorry, I meant to ask how many teeth on the speedo reluctor ring? It may not be 40 which is the default EFILive uses for manual transmissions. If it is not 40, then you will need to change the value in the speedo calculator. (Is it 10 or 11 teeth? Sorry I don't have that information at the moment)
    I have asked for the tooth count calibration to be added to the cal definition for that vehicle - for some reason it is missing.

    Also the trans output shaft revs/mile is rarely used on manual vehicles. On automatics it is used for calculating gear shift speeds. Sometimes it is not configured at the factory and a dummy/default value is left in there. You should allow EFILive to use the calculated value so that the speedo calculator can calculate the correct values.

    Regards
    Paul
    Sorry it took so long to reply. I've been working some long hours to get caught up before going on vacation tomorrow (in other words, I won't be able to reply back until next weekend). At any rate, I'm not sure how many teeth are on the speedo reluctor. Were is it located (I'm assuming inside the tailend of the M6, behind the VSS sensor)? If so, how can I tell how many teeth are on it? I'll do what I can to help out once I get back.
    2006 GTO, LS2, M6, EFILive Tune, Kooks 1-7/8" Signature Series Headers w/High flow cats, Corsa Sport Cat-backs, Ruff R930 18x8.5(Rt) 19x9.5 (Rr), BFG g-Sport 245/35VR-18 (Ft), 265/30VR-19 (Rr)

  9. #9
    EFILive Developer Site Admin Blacky's Avatar
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    Quote Originally Posted by CVs06Tahr
    Were is it located (I'm assuming inside the tailend of the M6, behind the VSS sensor)? If so, how can I tell how many teeth are on it?
    Yes it is. Apart from pulling it out, there is no easy way to tell. I'm trying to get the information on the tooth count... Regards Paul
    Before asking for help, please read this.

  10. #10
    Junior Member CVs06Tahr's Avatar
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    Bump...

    It's been a few weeks... any progress?
    2006 GTO, LS2, M6, EFILive Tune, Kooks 1-7/8" Signature Series Headers w/High flow cats, Corsa Sport Cat-backs, Ruff R930 18x8.5(Rt) 19x9.5 (Rr), BFG g-Sport 245/35VR-18 (Ft), 265/30VR-19 (Rr)

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