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RPMs at 75 MPh

Discussion in 'Gen 2 Prius Main Forum' started by Batavier, Aug 27, 2004.

  1. Batavier

    Batavier Member

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    Like the topic said, I was wondering how many RPMs the engine 'makes' when driving at that speed. I know it will probably vary a bit due to the eCVT in the car, but since it's a speed I often use (= maximum speed on the highway over here) I was just curious. :D

    Maybe one (or more) of you peeps know. :)
     
    #1 Batavier, Aug 27, 2004
  2. efusco

    efusco Moderator Emeritus
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    I'll check Wayne Brown's simulator when I recharge my PDA...damn batteries are dead. Unless someone beats me to it.
     
    #2 efusco, Aug 27, 2004
  3. bruceha_2000

    bruceha_2000 Senior Member

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    I think you'll probably recharge them before anyone else ;-)
     
    #3 bruceha_2000, Aug 27, 2004
  4. jamarimutt

    jamarimutt New Member

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    Based on what I've read, it should be maximum rpms- a whopping 5,000 :mrgreen:
     
    #4 jamarimutt, Aug 27, 2004
  5. HTMLSpinnr

    HTMLSpinnr Super Moderator
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    That depends. At full acceleration, max RPMs can happen after 45-50 mph. The Classic Prius didn't hit max RPM until 62mph.

    Cruise RPM however can be less, and depending on whether you buy into the "undocumented" heretical mode, where MG2 acts at the generator and MG1 acts as the drive motor (reversed roles) to force an overdrive situation, it could be much less. Scanner data tends to prove it's possible.
     
    #5 HTMLSpinnr, Aug 27, 2004
  6. Frank Hudon

    Frank Hudon Senior Member

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    flat ground steady state 130kmh should yeild about 2500RPM. It will vary with load and hills etc. but that would be a best guess. The PSD makes rpm very much a guessing game. To watch the rpm on cruise and what looks like flat ground and your asking why are the rpm's climbing and on the same road other direction and the rpm are dropping that tells you your eyes are lying to you on the "flatness of the ground". following at truck at a reasonable distance will change the rpm also, it's just not what most would consider an important reading anymore.
     
    #6 Frank Hudon, Aug 28, 2004
  7. efusco

    efusco Moderator Emeritus
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    I played around with the THS II simulator tonight (finally got around to charging the battery!).

    There's no one answer. At a minimum the RPM must be 262 RPM, even if coasting due to the 10k RPM limit of MG1.

    You can run the RPMs up to 5000 on the simulator program and MG1 is just going 7059 RPM while MG2 is going 4208 RPM.

    Thus, I conclude that there's no one correct answer. Frank's guess may be really close, but it's darn hard to tell. I think Eisenson got his tach installed and may be able to give us a range of RPMs when at steady state on flat terrain for the ICE.
     
    #7 efusco, Aug 28, 2004
  8. Frank Hudon

    Frank Hudon Senior Member

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    #8 Frank Hudon, Aug 28, 2004
  9. Batavier

    Batavier Member

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    Ah, thanks all!

    I was just asking because sometimes the engine seems to 'race' when I drive a steady 124 km/h on the speedo. But not always it seems, it's hard to determine because it's hard to hear the engine. :) Which is a good thing of course.

    Nice link there, Frank! Ta for that.
     
    #9 Batavier, Aug 28, 2004
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