Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13

Thread: Speedo drives

  1. #1
    Senior Member
    Join Date
    Dec 2010
    Name
    Kevin
    State
    ZH
    Location
    Rotterdam
    Country
    The Netherlands
    Posts
    206

    Default Speedo drives

    All information about servicing, changing and problems with speedo drives here.


    Bozu says

    I found this in my spare parts that came with the car I recently bought:


    Can someone tell me which gearboxes these are for
    Last edited by Sam-Q; 4th May 2011 at 12:39 AM.
    ADM AE86 Levin

  2. #2
    Veteran McLEVIN's Avatar
    Join Date
    Nov 2010
    Name
    Chris
    State
    SA
    Location
    Adelaide
    Country
    Australia
    Posts
    1,411

    Default

    idk distributor shafts?

  3. #3
    Veteran timbo's Avatar
    Join Date
    Aug 2009
    Name
    Tim?
    State
    QLD
    Location
    Wild West
    Country
    Australia
    Posts
    2,145

    Default

    speedo drives and worm gears. the go in you gearbox to read your speed!

    they should have 2 numbers on the nylon gear, e.g. 22 6, which means the nylon speedo gear has 22 teeth and the worm gear on the output shaft in the gearbox has 6. very handy to have al those as spares if you plan on changing your diff ratio.

    edit: bottom three look like they are for t series boxes and the top im unsure, maybe a w series?

  4. #4
    Ok
    Join Date
    Nov 2008
    Name
    Seamus
    State
    QLD
    Location
    Milton
    Country
    Australia
    Posts
    1,860

    Default

    looks like a T50 speedo drive, 3 T50 speedo drive gears/shafts

    and up the top is definitely a W series speedo
    4AGE & 7AGE Forged Connecting Rods - Lightweight Flywheels - And Much More



    ^ Clicky clicky!

  5. #5
    Senior Member
    Join Date
    Dec 2010
    Name
    Kevin
    State
    ZH
    Location
    Rotterdam
    Country
    The Netherlands
    Posts
    206

    Default

    Don't you just love the feeling when the pieces of the puzzle fall in to place!
    The previous owner of my car changed the T50box to a W57 box and T50 diff to a F series diff.
    Thanks guys, your help is greatly appreciated!

    But to get the technical part right, why do you have to change those parts if you change your diff?
    I understand a different diff ratio changes the rpm when the speed of the car stays the same but I don't see why you have to change those speedo gears...
    Last edited by Bozu; 2nd May 2011 at 02:11 PM.
    ADM AE86 Levin

  6. #6
    Ok
    Join Date
    Nov 2008
    Name
    Seamus
    State
    QLD
    Location
    Milton
    Country
    Australia
    Posts
    1,860

    Default

    Haha, yes it's good

    The speedo takes it reading from the speedo drive, which is in the gearbox - when you change your diff, it speeds up/slows down the gearbox, which effects the speed the drive (and cable) spin - thus your speedometer is off.

    Changing the speedo gear will account for this change, and make your speedometer right.
    4AGE & 7AGE Forged Connecting Rods - Lightweight Flywheels - And Much More



    ^ Clicky clicky!

  7. #7
    Veteran timbo's Avatar
    Join Date
    Aug 2009
    Name
    Tim?
    State
    QLD
    Location
    Wild West
    Country
    Australia
    Posts
    2,145

    Default

    as seamus said. at $60 a pop for the nylon gears they are quite a handy bonus!

  8. #8
    Senior Member
    Join Date
    Dec 2010
    Name
    Kevin
    State
    ZH
    Location
    Rotterdam
    Country
    The Netherlands
    Posts
    206

    Default

    Ah yeah I get it, I confused the speedo signal with the rpm signal...
    The change in ratio has to be the opposite then of the change in the diff isn't it? If the gearbox speeds up you want the speedo drive to slow down and vice verse right?

    Where is the rpm signal taken from?
    ADM AE86 Levin

  9. #9
    Ok
    Join Date
    Nov 2008
    Name
    Seamus
    State
    QLD
    Location
    Milton
    Country
    Australia
    Posts
    1,860

    Default

    Exactly right

    The tach is taken from the negative side of the coil - every time it pulses, it sends a voltage spike through the negative wire - your tacho works out how frequent they are, and magic happens
    4AGE & 7AGE Forged Connecting Rods - Lightweight Flywheels - And Much More



    ^ Clicky clicky!

  10. #10
    Senior Member
    Join Date
    Dec 2010
    Name
    Kevin
    State
    ZH
    Location
    Rotterdam
    Country
    The Netherlands
    Posts
    206

    Default

    Straight out, don't muck around!

    Thanks!
    ADM AE86 Levin

Page 1 of 2 1 2 LastLast

Similar Threads

  1. Yokohama S drives and the likes, after feedback
    By Rice86 in forum The Drift Channel
    Replies: 10
    Last Post: 12th September 2012, 12:10 PM
  2. wtb: ke70 that drives for cheap
    By milan_ke70 in forum Cars or Parts Wanted
    Replies: 0
    Last Post: 19th May 2011, 09:50 PM
  3. Replies: 11
    Last Post: 30th January 2011, 03:56 PM
  4. Ke70 speedo drives
    By grape_moosha in forum Technical - Questions
    Replies: 0
    Last Post: 16th February 2007, 09:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •