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Speed limiter

Discussion in 'Gen 5 Prius Technical Discussion' started by peternumber2, Aug 26, 2024 at 3:01 AM.

  1. peternumber2

    peternumber2 Junior Member

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    Hi everyone.

    I tried to search for similar threads with no luck.

    I was wondering if anyone managed to disable the speed limiter. I realised my Prius prime is limited to 180 km/h, though it gets there with a surprising ease!

    Just out of curiosity, not sure if I would do it.

    Thanks
     
  2. KMO

    KMO Senior Member

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    Is that 180 km/h actual or indicated? I believe it's documented somewhere that the real limit is 177km/h, and that would be due to hitting a 17000rpm limit on MG2 at 182km/h (with a 5km/h margin). Non plug-ins have a more arbitrary 180km/h limit. Plug-ins have a shorter final drive ratio, so their MG2 spins faster, so they're limited because of MG2 before hitting the general 180km/h limit.

    I've not heard of anyone managing to bypass the limiters in any generation.
     
  3. AndersOne

    AndersOne Active Member

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    Thas interesting, I was wondering while I was able to hit 190kmh (indicated) with the HEV - the PHEV stopped around 180kmh so far.

    For someone that never had a sportscars its really wild though how effortless this accelerates to vmax - without the limiter I would not even notice sometimes.
     
    #3 AndersOne, Aug 26, 2024 at 4:27 AM
    Last edited: Aug 26, 2024 at 8:38 AM
  4. KMO

    KMO Senior Member

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    All modern cars have far more power than they need for Vmax. It's a bit silly, tbh...

    The top speed difference from the specs is only supposed to be 3km/h, but maybe the MG2 177km/h limit is a bit harder than the general 180km/h somehow - maybe applied by different ECU logic.

    That 177km/h also could have been for 19" wheels. On the 17" wheels that would correspond to 174km/h, due to slightly smaller circumference.

    The 180km/h general limit might have been tweaked along with the speedo for different wheel sizes, but the MG2 limit would remain at the same rpm, representing slightly different speeds.
     
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    That a positive step. (y)