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Thread: Speedo Correction

  1. #1
    Lifetime Member hquick's Avatar
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    Default Speedo Correction

    After the installation of the 0411 I've had to make a few changes.
    I noticed I seemed to be passing most people on the freeway at the given speed.
    In checking my speedo calibrations I found that the wrong diff ratio (was 3.43 mine are 3.73 according to the code in my glovebox which lists GT4) was in there as well as tyre size.
    I used the tyre size calc to reset it (245 75 16) and it came out at 30.47".
    Upon using this, I found my speedo was still out. I measured the tyre height from the ground to the top of the tyre...using a level to make sure it was an accurate measurement and I get a height of 28.75" (my tyres are getting worn).
    I inserted this new measurement but when monitoring my drive to work this morning, the speedo was saying 100kph but the scanner was saying 96!
    I just adjusted this in the speedo cal table. Will this be right now?
    There is a speed camera on the way to and from work...I don't want to find out the hard way I've done it wrong.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  2. #2
    Lifetime Member Biggsy's Avatar
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    Default

    Get your hands on a GPS, I use one to confirm my calibrations. They are very accurate. (unless Uncle Sam starts turning off Sattelites, which has happened in the past with wars)
    Dave.

  3. #3
    Lifetime Member hquick's Avatar
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    Default Thanks...

    But it's not really an option right at the moment.
    I loaded the re-cal'd speedo cal but it's still out by around the same 4k's.
    Any idea's?
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  4. #4
    Lifetime Member eboggs_jkvl's Avatar
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    Default

    How are you doing the "update"? What steps are you taking. Are you sure you're doing the update, the save and the load properly? This part of the program is usually pretty straight forward.

    Verify tire size (or enter)
    Verify Tire recalibration is done
    Verify correct Final Drive ratio
    Click "Apply"
    Save File
    Load file.

    Is that what you are doing?

    Elmer
    Last edited by eboggs_jkvl; April 4th, 2007 at 12:44 AM.

  5. #5
    Lifetime Member hquick's Avatar
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    Default

    Hi Elmer,
    yes, that's exactly what I did.
    Then I went through the fine tune process of adjusting the speedo to the speed shown on the EFILive dashboard/scanner.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  6. #6
    EFILive Reseller wait4me's Avatar
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    Default

    If you see being off by just a few. Then go to the "Speedo Fine Tuning" and put in your actual, and the dash numbers, then it will Fine tune it for you.
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  7. #7
    Lifetime Member hquick's Avatar
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    Default Tried that.

    Thanks Jesse,
    I tried that already. I'll try again. Maybe I did something wrong.
    Actual is the speed being read by the scanner right? Not the trucks dash.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  8. #8
    EFILive Reseller wait4me's Avatar
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    Default

    No you need to go by the DASH. Scanner could be wrong due to the Cluster itself could have been programmed with a different speedo value.
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  9. #9
    Lifetime Member hquick's Avatar
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    Default

    OK, thanks.
    I'll give it another go this arvo.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  10. #10
    Lifetime Member hquick's Avatar
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    Default

    So, are you saying I really need to use some other devid\ce for reading my speed?
    I insert my speedo speed in the 'displayed speed' box and insert a speed as read from a GPS in the 'actual speed' box

    OR

    I insert my dash speed in the 'actual speed' box and insert the scanner speed in the 'displayed speed' box.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

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