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Thread: Speedometer not reading correctly

  1. 08-18-2007 #1
    408Z28
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    Speedometer not reading correctly

    My car originally came with a 6 speed and was converted to a turbo 400. I wired the speedo up and entered my tire size(28") and gear ratio(3.50). It seems to read about double of what I'm actually traveling.
    I ended up changing it to 22" tire and a 6.00 gear and it seems alot closer. The VSS pulses per mile is 93498 and the trans-rev is 17.0000. The trans revolutions/mile is at 1601.0741.
    Is something messed up because of it formerly being a six speed car or do I really have something messed up. Any help is greatly appreciated.
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  2. 08-18-2007 #2
    BBA
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    Probably a different speed sensor or sensor gear in the trans.
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  3. 08-20-2007 #3
    Johnny5
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    Search for Johnny5 because I posted the same thing a while ago and worked through it. You went from a 17 tooth reluctor ring to a 40 with the auto. Had you done an A4 to TH400 swap you'd be good but now your off by around double'ish.

    Check that post for instructions.
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  4. 08-27-2007 #4
    408Z28
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    Quote Originally Posted by Johnny5
    Search for Johnny5 because I posted the same thing a while ago and worked through it. You went from a 17 tooth reluctor ring to a 40 with the auto. Had you done an A4 to TH400 swap you'd be good but now your off by around double'ish.

    Check that post for instructions.
    Thanks!
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