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Warming up Prime in Cold weather.

Discussion in 'Gen 5 Prius Technical Discussion' started by JohnnyEmac, Feb 14, 2024.

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  1. reallyreal

    reallyreal Member

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    The next 4 minutes of this video is the only test I found of full throttle in ev auto mode with a cold engine. The youtuber says the power output is limited until the engine is warmed up, and comparing the engine sound at the beginning and at the end of the 4 mins it seems to be the case, but I never tried myself.
     
    #81 reallyreal, Jun 12, 2024
  2. sylvaing

    sylvaing Active Member

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    Well, I turned on the Defroster at 28°C and the engine stayed off so it's definitely temperature based...
     
    #82 sylvaing, Jun 18, 2024
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  3. DOHCtor

    DOHCtor Member

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    Gen 5 Prius and Primes don't have the exhaust heat trap that the Gen 4 Priuses and Prime used.. unfortunately. My guess is Toyota changed a whole lot th these on warranty on Gens 4 and avoided the potential cost/trouble on gen 5. Shame. It really helped efficiency, specially during winter... oh, and the trap was after both catalytic converters as they are useless if cold. What you see there between both exhaust hangers is a resonator. ;)
     
    #83 DOHCtor, Jun 22, 2024 at 11:30 PM
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Yeah think you’re right:

    IMG_4547.png
     
    #84 Mendel Leisk, Jun 23, 2024 at 7:51 AM
  5. Tideland Prius

    Tideland Prius Moderator of the North
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    #85 Tideland Prius, Jun 23, 2024 at 5:01 PM
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  6. KMO

    KMO Senior Member

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    The G5 does not have the G4's exhaust heat recirculation system.

    NCF pics, G4 first:

    upload_2024-6-25_8-30-50.png

    Then G5:

    upload_2024-6-25_8-31-31.png

    @Tideland Prius 's highlighted part is the "Sub Muffler", which is after the catalytic converter or GPF. (Camera is towards the back of the car in the video still).
     
    #86 KMO, Jun 25, 2024 at 1:36 AM
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  7. Mendel Leisk

    Mendel Leisk Senior Member

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    I just see hanger rods, no pipes. And no hoses.
     
    #87 Mendel Leisk, Jun 25, 2024 at 9:46 AM
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  8. Trollbait

    Trollbait It's a D&D thing

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    The rods are technically pipes. The end welded to the sub-muffler is open.
     
    #88 Trollbait, Jun 25, 2024 at 10:48 AM
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  9. DOHCtor

    DOHCtor Member

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    We even have a used one changed under warranty at work. If requested i'll take a pic or 2!
     
    #89 DOHCtor, Jun 26, 2024 at 10:21 PM
  10. black_jmyntrn

    black_jmyntrn Senior Member

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    hm,mmmm
     
    #90 black_jmyntrn, Jun 27, 2024 at 5:00 PM
  11. black_jmyntrn

    black_jmyntrn Senior Member

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    I'm wondering how much of this part is in the coding of a G4 and if it can all be removed if routed properly permanently when using the bypass?


    the bypass appeared as it if would last the test of time.

    upload_2024-6-27_14-4-46.png
    https://black.jmyntrn.com/2023/12/02/prius-prime-p148f-00-was-unrelated-to-engine-coolant-pump/?utm_source=PriusChat&utm_medium=weblinkt&utm_campaign=commentlinkJune

    heh.. I still love yall dealership tho, even after one almost got me to buy a water pump and they knew about the warranty recall on the heat exhaust exchanger!

    upload_2024-6-27_14-6-20.png
    https://black.jmyntrn.com/2023/12/08/toyota-dealership-almost-got-me-to-pay-for-fixing-the-water-pump-on-a-2017-prius-prime/?utm_source=PriusChat&utm_medium=weblinkt&utm_campaign=commentlinkJune
     
    #91 black_jmyntrn, Jun 27, 2024 at 5:06 PM
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