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Need for RPM and engine coolant temperature display on a Prius

Discussion in 'Gen 3 Prius Main Forum' started by hendji, Oct 22, 2014.

  1. Grit

    Grit Senior Member

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    I drive w/hybrid assistant app on most of the time, at least it has rpm and engine temp. My first mile of driving from cold soak is in a 25 mph zone so I keep an eye on the temp, when it’s warm enough I’ll push over 2k rpm on the engine.
     
  2. john1701a

    john1701a Prius Guru

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    Prius isn't traditional. It has a battery-pack and traction-motor to protect the gas-engine during the warming process. Prius has a specially adapted engine to reduce wear too.

    So, there is no need to monitor RPM.
     
  3. StarCaller

    StarCaller Senior Member

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    adapted like what?
     
  4. john1701a

    john1701a Prius Guru

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    Rapid, low-stress warmup... The lighter pistons, the offset camshaft, the ultra-thin synthetic oil, the powerful starter/assist motor, the path for fluids & exhaust... They are all improvements upon the traditional approach.
     
  5. royrose

    royrose Senior Member

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    Not everything I do is based on need. I like to see RPM.
     
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  6. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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  7. Grit

    Grit Senior Member

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    I've seen people here recommend a 2009 gen 2 over a 2010 gen 3 more than often because of the knock start up (low-stress warm up) and clogging EGR (fluids & exhaust), it doesn't show improvement because of the recommendation to go with a previous generation.
     
  8. john1701a

    john1701a Prius Guru

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    That has nothing to do with my comparison to the traditional approach. I was not comparing generations.
     
  9. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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  10. CR94

    CR94 Senior Member

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    What camshaft is not offset? Or did you mean cylinders offset relative to crankshaft? That is common nowadays.
    Funny isn't it, that all the supposed improvements you listed reside in a notoriously short-lived, high-maintenance engine?
     
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  11. BruceInOKC

    BruceInOKC Member

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    Yes, that's true within reason, but the engine protection isn't absolute. Flooring a cold engine is still a bad idea.

    A cold engine should be driven gently. A warm engine should be driven gently for mileage (unless high rpm is required for safety).

    Yes, the Prius can be driven quite well without a tachometer or coolant gauge, but I personally like more engine information.
     
    #51 BruceInOKC, May 15, 2019
    Last edited: May 15, 2019
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  12. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    My ScanGauge II can read stock:

    CLSD LP OPEN LP Fuel System Loop Status
    MAP Manifold Absolute Pressure*
    BST Boost*
    MPG KPG MPL LHK KPL Miles Per Gallon Kilometers Per Gallon Miles Per Liter Liters Per 100Km Kilomteres Per Liter
    MPH KPH Miles Per Hour Kilometers Per Hour
    RPM Revolutions Per Minute^
    TPS Throttle Position Sensor
    FWT CWT Water Temperature^
    AVG Average Fuel Economy
    TFC Trip Fuel Cost
    CPM Cost Per Mile
    VLT Battery Voltage^
    FIA CIA Intake Air Temperature^
    FPR Fuel Pressure*
    GPH LPH Gallons Per Hour Liters Per Hour
    IGN Ignition Timing
    LOD Engine Loading
    HPR Horsepower*

    * I am not sure Toyota has this sensor, the Scangauge is only reporting sensors Toyota has.
    ^ I use these in my v.

    Gauges you can program the Scangauge II to know in a Gen 4:

     
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  13. BruceInOKC

    BruceInOKC Member

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    ...or maybe the engine protection is absolute, but I'm scared to test it out on a cold engine.
     
  14. CR94

    CR94 Senior Member

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    There are many others available, at least in Generation 3. Ones I usually or often watch are:
    Coolant temperature,
    Battery temperature,
    Engine speed,
    Battery current (erratic readings, 'tho),
    Voltage.of 12-v system.

    Others occasionally. I would like to delete some of the useless items.
     
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  15. Mendel Leisk

    Mendel Leisk Senior Member

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    Battery temp is an XGuage (requires you to program it in in), but yeah, very interesting to watch. Also battery fan speed: also an XGauge.

    Sadly, my constant ScanGuage hook up seemed to be causing Check Hybrid System issues (flakey OBD connector?), so I discontinued about 4 years back. So yeah: please Toyota, add an effing coolant temp gauge.
     
  16. pree_us

    pree_us Member

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    Here's a photo of my using the "basic" (aka free) Torque App on my aftermarket 9.0 Android HU . . . other monitoring gauges are available. I chose to keep it simple avoiding information overload.
     

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  17. tvpierce

    tvpierce Senior Member

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    Nice.

    What data is "Load" based on?
     
  18. ghost2255

    ghost2255 Junior Member

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    I've mounted chinese meter from Aliexpress. Price is about 25$.
    It shows coolant temp, speed, revs and voltage. All at once.
    You can select what you want to display.

    I'm satisfied with this. Price is low, device is very useful
     

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  19. abubin

    abubin Member

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    I find hybrid assistant to be most comprehensive with it's readings. It might not look "pretty" but if what you want are reading, it is readings you get.

    [​IMG]

    Another important feature that hybrid assistant and dr.prius provide is the HV fan speed control. I set it to 35c when I am driving because it will increase the fan speed for better cooling. In a climate that is always freaking hot here, it is an important feature because keeping the HV batteries temp low is important in preserving longer lifespan.

    Oh, BTW you do get to see the coolant temps if that's what you are after.
    [​IMG]
     
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  20. srivenkat

    srivenkat Active Member

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    Nothing is displayed for FPR on my SGII on my 2020 Prius Prime.