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Thread: speedometer calibration??

  1. #11
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by n8scstm
    Thanks, thats cool. But I need more than 28%. I had 30" tires. Now I have 40" tires. But I guess after I gear it, then it would work. But I'm not sure if I wanna spend $1000 to gear the rear end at this point.
    Use two of those

  2. #12
    Stank Cheese n8scstm's Avatar
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    LOL. If that even works I really can't justify spending $200 when I could get the programmer for $400. Come one guys, I was trying to be cheap. Guess I chose the wrong hobby.
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  3. #13
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by n8scstm
    LOL. If that even works I really can't justify spending $200 when I could get the programmer for $400. Come one guys, I was trying to be cheap. Guess I chose the wrong hobby.
    http://www.autotransinc.com/Recal.htm
    http://www.drivetrain.com/autotransc...alibrator.html

  4. #14
    Constant Bitrate
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    Quote Originally Posted by lawrence
    I have work on mitsubishi /chysler and on certin cars pinon factor can be set with the DRB3 , but only to the tire sizes set at the time of manufacture.
    i do not know about other car lines as they may have something the same.
    but i dont think that any scaner will do this, as the name implies they scan but do not reflash. to reflash a engine control unit needs a programer. programers are done by the manufacter , and to reflash without epa approval is a emmision violation. no maker of a "scaner" want that kind of heat from the epa, without a "off road use only" waiver.
    The DRBIII software does some calculation based on tire sizes that were preconfigured so that the proper pinion factor is implemented with the most common tire configurations. The vehicle needs a mathematical figure to correctly display speed based on calculated speed. The DRBIII software does this calculation for the user to speed up routine service processes.

    Changing the pinion factor does not require a reflash of the ECU. It is a setting that gets updated on the ECU's current firmware. The firmware is certified by the OEM to comply with the EPA regulations. The issue of a scan tool provider supporting pinion factor is one of work and not regulation. Each OEM does it differently (on each vehicle line) so the effort of those permutations is significant. And the availability of vehicles to validate that it works is another level of effort and cost.

  5. #15
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    Quote Originally Posted by n8scstm
    LOL. If that even works I really can't justify spending $200 when I could get the programmer for $400. Come one guys, I was trying to be cheap. Guess I chose the wrong hobby.
    Use this. Use Photoshop to adjust the location of the markings. Print out on photo paper. Drymount to your speedo. Done
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  6. #16
    Constant Bitrate old_lou's Avatar
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    I think you can get your speedo readings from your GPS and show them on screen instead of using your speedo. I know Tom Tom shows your speed on a pda setup
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  7. #17
    MySQL Error Scouse Monkey's Avatar
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    Damn you bugbyte you beat me too it! The best idea by far - cost you penies and you can put some nicer dails in your whole dash!

  8. #18
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by old_lou
    I think you can get your speedo readings from your GPS and show them on screen instead of using your speedo
    Was using a TomTom today and it was showing my speed about 5mph higher than the clock in the rented Passat i was driving and also does the same in the Merc. Readings where very constant too so it seemed pretty accuate - very strange. Maybe most cars underread a bit - would explain why the speedo in my mums fiesta 1.1 used to do 110 when i was leaning to drive in it

  9. #19
    Constant Bitrate
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    Quote Originally Posted by Bugbyte
    Use this. Use Photoshop to adjust the location of the markings. Print out on photo paper. Drymount to your speedo. Done
    Problem is you will have to stretch the dial to the right or left from zero for it to be accurate

  10. #20
    My Village Called 0l33l's Avatar
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    Ninja Monkey's D3 also has a huge speedo. iG and Routis have tiny speedos.

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