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high RPM question

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by johnnychimpo, Oct 19, 2021.

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  1. johnnychimpo

    johnnychimpo Active Member

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    1.when the battery is full or close to it when does the engine just try to burn off energy by reving engine? And does it behave like when you put it in B mode as in no fuel? does it need to be full battery or almost full?

    2.what is redline for a prius?

    I was driving and was exiting doing about 70 mph and the engine shot up to 3900 even when I was at like 30 MPH still at 3900 so I put it in B mode and it when down to normal. what would cause the engine to reve and stay revved up frankly would have runaway if I did not put it in B mode.
     
    #1 johnnychimpo, Oct 19, 2021
  2. meeder

    meeder Active Member

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    Yes when the battery is almost full and can't take much more energy it will spin the ICE.

    For the gen 3 Prius the maximum power output is at 5200rpm. It will probably limit the rpm's at that number or maybe a bit higher but nog much. There isn't any need to rev higher.
     
    #2 meeder, Oct 19, 2021
  3. JC91006

    JC91006 Senior Member

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    How are you monitoring the RPM? There is no gauge for that.
     
    #3 JC91006, Oct 19, 2021
  4. johnnychimpo

    johnnychimpo Active Member

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    I have an obdII bluetooth connected to my phone.
     
    #4 johnnychimpo, Oct 19, 2021
  5. AzusaPrius

    AzusaPrius Senior Member

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    #5 AzusaPrius, Oct 19, 2021
  6. JC91006

    JC91006 Senior Member

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    If this car were a performance car, maybe you can monitor that stuff. But this being a lowly Prius, I don't think you should waste your time or energy in monitoring it.
     
    #6 JC91006, Oct 19, 2021
  7. fuzzy1

    fuzzy1 Senior Member

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    I have never seen my engine braking or battery burn-off mode reach 5200 RPM, let alone exceed it, even in conditions where engine braking alone is no sufficient to hold speed steady. I do get plenty of B-mode operation in the 4600-4900 RPM range.
    8 years and nearly 15k posts here, and you have never hear of a ScanGauge-II or any of the many newer OBDII-port monitor products that provide this and numerous other gauges?
    Really now, whose decision should this be?
     
    #7 fuzzy1, Oct 19, 2021
  8. JC91006

    JC91006 Senior Member

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    Surely if this were an item that's necessary for you to monitor, Toyota would have put a gauge in the car.
     
    #8 JC91006, Oct 19, 2021
  9. fuzzy1

    fuzzy1 Senior Member

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    Surely we are not in a position to tell others that if it isn't necessary, then it also shouldn't be exercised as an option. Or that there is no reasonable middle ground in between necessary and forbidden.
     
    #9 fuzzy1, Oct 19, 2021
  10. JC91006

    JC91006 Senior Member

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    Nobody ever said it's forbidden to check things, I just stated it's not necessary to monitor RPM and Temp readings, unless you are having an issue of course. Don't do it for the fun of it.
     
    #10 JC91006, Oct 19, 2021
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