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  1. #1
    Registered User
    Join Date
    Nov 2018
    Location
    Ottawa, ON Canada
    Posts
    2

    Speedo reading 15% high... Mysteries

    So I've been sorting out the new to me 2002 ep3 that I picked up this month... One thing I'm not getting figured out is my speedo accuracy.

    I'm on a fresh set of stock sized tires (195/60r15), but the speedo reads really high.

    I've verified against GPS and radar speed displays and let's call it 15%, But that varies with speed, down low (40kmh) it's about 20% high.

    I checked the trans code and a previous owner replaced the sir trans with a base RSX so the final drive is 4.389 instead of 4.764. if using the sir VSS, that would be 8.5% high, but the thing is I took 10 minutes at looking at the VSS and it did not want to come out. I bet it's from the RSX trans and hasn't been out. So it should be correct to the FD.

    Could it be the speedo stepper motor itself?

  2. #2
    Registered User
    Join Date
    Nov 2018
    Location
    Ottawa, ON Canada
    Posts
    2
    Anybody? Any body know if the base RSX VSS went to high frequency in 05-06 too, like type s?

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