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Speedometer Sensor

Discussion in 'Model 3: Driving Dynamics' started by Daskid, Aug 28, 2019.

  1. Daskid

    Daskid Member

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    Does anybody have an idea where the speedometer sensor is installed? Is it on the front or rear wheels? I’m asking because I plan to get different size tires for a staggered setup but I don’t want to change the speedometer readout by a significant amount.

    I’ll be getting the correct size tires for the wheels where the speedometer sensor is installed and changing the size of the other set of tires.
     
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  2. RoBoRaT

    RoBoRaT Zero Farts Given!

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    Bro, did you find an answer to this?

    I have a 19" wheel with 255/40 tire that I wanted to test on a Model Y (stock 255/45R19).

    I wonder if the speedometer on a Model Y or Model 3 is based on wheel/tire rotation or GPS.
     
  3. Mash

    Mash Supporting Member

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    Every wheel has speed sensor, so, no, you can't trick it.
     
  4. MasterC17

    MasterC17 Member

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    All four wheels have wheel speed sensors. You can't trick them, and installing the wrong sized tire will result in ABS/TC/SC/etc faults. Just get the right sized tires...
     
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  5. WarpedOne

    WarpedOne Supreme Premier

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    Wheel speed sensors?
    On an ev with a fixed ratio gearbox and no clutch?
    With and absolute motor position sensor?

    Muhahahahaha ...:):):):):):):)
     
  6. RoBoRaT

    RoBoRaT Zero Farts Given!

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    So, which is it?
    Not being petulant, just wanting to see if I can repurpose tires.
     
  7. WarpedOne

    WarpedOne Supreme Premier

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    I'm just full of it ... yes, each wheel has a speed sensor - it's part of ABS system.
    But that does not mean you can / can't mount different tyres... it depends how big the difference really is.

    Tyre Size Calculator shows 255/40R19 and 255/45R19 have 3,6% difference in diameter/circumference which is a a bit high, tolerances are about 3%.
    Using these smaller wheels will give you 3% more torque and better acceleration though...
     
  8. RoBoRaT

    RoBoRaT Zero Farts Given!

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    Got it. Good to know, thanks.
     
  9. brkaus

    brkaus Well-Known Member

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    Not take really a good idea if you have an AWD car. Different sizes are fine - but need to manage the rims & tire size/ratio to maintain diameter.
     
  10. Mash

    Mash Supporting Member

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    Are you implying there are no wheel speed sensors or that somehow motor encoder gives more precise data for speedometer?

    P.S. I don't usually read threads to the end before replying....
     
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