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diff ratio change. speedo correct! yer i know pls read

Discussion in 'Mace Engineering' started by Cuzzy69, Nov 1, 2018.

  1. Cuzzy69

    Cuzzy69 New Member

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    tryed jatcar sht no luck... i have heard that u can mod the ecu to suit the different diff ratio ?
    any one know ware or who.... happy to take car anyware in melbourne vic. my home software brings up the ratio as 3.08 but i have 3.89. need someone to change the table in the ecu or where ever? that should be the best fix all round i hope. done lots of searching on site but no contacts provided.. pls help
     
  2. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    It's not that simple unfortunately. You can change the setting in the tune but you will have to change all the transmission tables to suit but that still doesn't solve your problem because (as I understand it) the speed signal from the transmission passes straight through the PCM and isn't modified by the tune so your speedo will still read incorrectly.

    The only real option is to fit a speedo corrector box.
     
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  3. Cuzzy69

    Cuzzy69 New Member

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    yes that what i understand so i need a gearbox tune in the pcm ecu to suit...if i change the speedo sensor before the ecu. happy to dyno and tune if someone can do it. MACE adjust shift point when u buy the larger thottle body so they must be close to working it out..there are so many ppl out there with this problem, someone should be able to sort it by now? dont mind spending the money if it works.
     
  4. MACE

    MACE Well-Known Member

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    Could you let us know motor do you have? It would be possible to recalibrate the seepdo using Tech 2 tool but it would depend on what motor you have.

    Best Regards,
    Jason
     
  5. Cuzzy69

    Cuzzy69 New Member

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    hi Jason ive got the ecotec v6 and auto. 96 v6 wagon. thanks
     
  6. Cuzzy69

    Cuzzy69 New Member

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    yet again on my 3rd speedo box not working.... every setting and auto electrician has fitted with me...... fk not working help
     
  7. Cuzzy69

    Cuzzy69 New Member

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    newe ideal! just move the needle back 10 degress or so ? sould work nice???? and free will do tomorrow.. let u tommorrow
     
  8. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    The new jaycar speedo corrector doesn't seem to work properly unfortunately, there are others on the market but I can't remember the names atm. Moving the needle doesn't work as the as the difference is a %age and not a fixed amount.
     
  9. Cuzzy69

    Cuzzy69 New Member

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    thanks heaps jason.. just adjusted the speedo ill see what happens?????? let you know..about right is all i want. lol. had to install a small screw so the needle doesnt go into the lower plastic and get stuck 2 mins ....easy still look factory....may or may not work but im guna try as its easy for me... merry Christmas to all..

    ps wont know until tomorrow night as i need to fix the rear hand brake return spring and take off blocks lol then gps the car.... also checking out the new mace spacers installed.. top bottom v6 awsum 25 and 12 i think
     
  10. Cuzzy69

    Cuzzy69 New Member

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    getting it close at above 60 kph.. enough to trust im not speeding ,,but not to much that i dont believe the high overeating speedo. still need it fixed properly so any help needed. im happy to spend the cash on the right product or tune.
     
  11. Cuzzy69

    Cuzzy69 New Member

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    spoke to marks 4wd adapters in vic. this model im told will work on 4 speed auto. Part Number: MFKSGI-5E
    https://www.marks4wd.com/mfksgi-5e.html

    About $250 bucks. will try soon. as for now moving the needle downwards.. eg pull of needle and preposition it at below zero by about 2cm it reads 65 at 60.. 80 at 80 87 at 90 etc.. bit of a guessing game below 60 but should help a few out. so basically it under reads below 70 and over reads above but very close.. i have the 3.89 diff and 255/40/17 rims at back. very close to stock diameter. the needle was about 2cm lower than standard on the s3 dash and a small self tapping screw used to stop the needle from falling into the plastic shroud below it. you will need to pull out the dash insert and split it open to do this.. very easy. at least now at most legal speeds i got a fair ideal of speed as before it read so high it was to hard to guess. all the best guys hope it helps a bit.
     
  12. MACE

    MACE Well-Known Member

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    Did you end up solving this Cuzzy?
     
  13. Cuzzy69

    Cuzzy69 New Member

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    I have been informed that marks 4wd adapters can supply one with a guarantee to work. price around $250.
    https://www.marks4wd.com/speedo-correction.html
    will get one when my l67 is finished. cheers
     
  14. delcowizzid

    delcowizzid on holiday

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    The Dakota digital Speedo corrector is only about 85-100 bucks
     
  15. Cuzzy69

    Cuzzy69 New Member

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    i can only find them for around 200? any place u know cheap
     
  16. gtrboyy

    gtrboyy Well-Known Member

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    vdo speedo corrector still available?

    That is what we used to use when jaycar item tanked
     
  17. 07GTS

    07GTS Well-Known Member

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    yep still have them but prices have gone up, vdo just use Bolec elec ratio box
     
  18. MACE

    MACE Well-Known Member

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    Thank you for the info, please let us know if we can be of any other help.

    If you have any other questions, please do not hesitate to ask.

    Kind regards,
    Michael
     
  19. Stock AFM SS Wagon

    Stock AFM SS Wagon New Member

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    Need to change the PPM (pulses per minute) in the gearbox via Tech2. Find the standard PPM and divide it by the standard diff ratio, then multiply that number by the new diff ratio and that will give you your new PPM to enter, then all is done.
    IE- 2000 PPM ÷ 3.08 = 649.
    649 × 3.89 =2524PPM
     
  20. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    If only it was that simple....
     
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