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Pulses per revolution S-10 T-5 tranny

Discussion in 'The Hokey Ass Message Board' started by 48bill, May 2, 2006.

  1. 48bill
    Joined: Mar 27, 2001
    Posts: 384

    48bill
    Member

    My friend just installed a 1989, 4 cylinder, S-10, T-5 tranny in his flathead powered 31 ford roadster. The T-5 replaced a 47 truck tranny with a mechanical sender to the speedometer. The T-5 has an electrical connector for an electronic speedo. The Stewart Warner techie tells us we need to know the output in pulses per rev in order to get the right electronic speedo.

    Can any body help?

    Thanks.

    48 Bill from Connecticut
     
  2. coryw
    Joined: Nov 4, 2005
    Posts: 225

    coryw
    Member
    from Omaha, NE

    I'm assuming it works similar to a 700R4. In a 700R4 (and there are plenty of people on here that know LOTS more about them than I do), there are two gears that are matched with the tire size and rear axle ratio in order to get a constant pule per mile. I think that number was 4000 pulses per mile but I'm not sure. Since you're not running the S10 tire size or S10 gear ratio most likely yours is going to be off from the stock S10. I'm guessing what the SW guy needs to know is how many teeth on each of those gears along with your tire size and gear ratio. On the 700R4 those gears are color coded to make things a little easier. Or maybe I'm just not understanding the question. Hope it helped and if not at least I bumped it up for you.
     
  3. 50flathead
    Joined: Mar 8, 2005
    Posts: 1,153

    50flathead
    Member
    from Iowa, USA

    If you have not already bought your speedo/gauges, TPI Tech has a one push programing button so you can program your speedo to whatever drivetrain setup you have. I'm suprised SWs don't work the same.
     
  4. Vergil
    Joined: Dec 10, 2005
    Posts: 785

    Vergil
    Member

    I checked with Classic Instruments about the same question and their response was
    "Our electronic speedometers will work with a GM electronic output, we just need you to use a converter box (we would supply)."
     

  5. OLDSKEWL61
    Joined: Feb 8, 2006
    Posts: 565

    OLDSKEWL61
    Member

    to find pulse you need to hook up the two wires from the vss in tranny to an oscilascope
     
  6. Roupe
    Joined: Feb 11, 2006
    Posts: 723

    Roupe
    Member

    Old post but does anyone know the number of pulses per revolution?
     
  7. bobscogin
    Joined: Feb 8, 2007
    Posts: 1,761

    bobscogin
    Member

  8. Roupe
    Joined: Feb 11, 2006
    Posts: 723

    Roupe
    Member

    Thanks, that answers my question.
    If anyone wants to know its 40 pulses per revolution at the tail shaft for a S-10 T-5 transmission.
    For me with 31 inch tires and 3.50 gears that equals 2278 rpm per mile at the tail shaft X 40 pulses per revolution equals 91120 pulse per mile.
    With this number I can program the number of pulses into the electronic VDO speedometer that I installed inside my '50's vintage police speedometer. I should now be real close. I hope to check the accuracy in the future with a GPS.
     

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