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"Ultra-Fast Warmup Switch" idea

Discussion in 'Generation 1 Prius Discussion' started by Tryyn, Dec 10, 2021.

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  1. Tryyn

    Tryyn Junior Member

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    During our 02's recent incident of no heat, I noticed that the Stage 4 (idle stop/EV) threshold was reached about 2-3 minutes after startup. After coolant was added, going back to normal warmup times (5+ minutes) was frustrating.

    Would there be some way to reduce engine cooling, get to operating temp ASAP, and then allow coolant flow so I have heat? I'm imagining a solenoid valve hooked up to a button marked "WARMUP ASSIST" or "WARMUP."
    I was also thinking about a secondary air induction hose running near the hot exhaust manifold, with an electric valve hooked to a similar "WARMUP ASSIST" switch. That would allow fast warmup to idle-stop mode in the winter, and maximum power and efficiency (using the stock cold air intake system) once warmed up.

    Has anyone tried either of those ideas? I know warm-air intakes are quite common in the Insight community.
     
    #1 Tryyn, Dec 10, 2021
  2. bisco

    bisco cookie crumbler

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    block heater?
     
    #2 bisco, Dec 11, 2021
    ammdb, Leadfoot J. McCoalroller and Mendel Leisk like this.
  3. sam spade 2

    sam spade 2 Senior Member

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    There already is a device in the coolant path called a thermostat. It operates automatically.

    Exhaust heat recovery existed for a long time on a LOT of engines but I think they were eliminated when their usefulness was found to be tiny compared to the cost of maintenance.
     
    #3 sam spade 2, Dec 11, 2021
  4. dolj

    dolj Senior Member

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    Doesn't the Gen 1 already have such a system as standard?
     
    #4 dolj, Dec 11, 2021
  5. ChapmanF

    ChapmanF Senior Member

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    Not that I recall.
     
    #5 ChapmanF, Dec 12, 2021
  6. ammdb

    ammdb Active Member

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    #6 ammdb, Dec 12, 2021
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