Hybrid, Keeping Exhaust Hot

Discussion in 'Fuel Economy' started by billford, Apr 15, 2014.

  1. billford

    billford New Member

    Hello everyone,

    I have a Ford Fusion Hybrid. Everything works great but I want to get the best fuel economy possible out of this car.

    In cold weather, the engine takes a while to warm up, it cools down pretty quick when waiting in traffic and going into battery mode while driving.

    I was going to try and wrap the exhaust manifold pipes up to the cat convertor with header wrap to try and retain some heat, so the O2 sensor and cat convertor stay hot.

    If anyone has ever tried this, can you let me know if it made any difference.

  2. 08EscapeHybrid

    08EscapeHybrid Moderator

    Interesting idea, I'm not sure I've ever heard of anyone trying it.
  3. Harold

    Harold Well-Known Member

    Do you block your grill? If not try that first. You will need a scan gauge or something so you can watch the temps. H
  4. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    Agreed. That will keep the engine warm as well as the exhaust. Besides, it's easier to do.
  5. billford

    billford New Member

    I have tried blocking the grille, it did not help. The car already has radiator shutters from the factory, so the grille blocking really did not add anything on top of the factory shutters.
    The exhaust header wrap is pretty cheap. I will install it this weekend and post my results.
  6. vangonebuy

    vangonebuy Well-Known Member

    While I see no loss from this idea. I see no real gain.
    A warm 02 sensor will only allow the motor to run leaner.
    I believe your stated goal is to keep it off longer.

    Most times my Gas Engine start is Heat demanded.
    Sometimes HV battery drainage, like fan or headlights.
    Never, Have I seen it start just to heat the 02 sensors.
    My car will sit happy and cold in most traffic stops. For a long time. With the heat off.
    Once started, the engine will run longer to heat the 02 sensors, But it also uses this time to charge the batteries.
    Your 02 sensors are covered by the bottom cover. In a warm area.

    While cold engine is running.
    I find the water temp is most important for engine cycling.
    I want a block heater.
    But, a few FFH users mentioned a error code (last year) from their block heaters in the midwest. So I held off for now. Problem now seems solved.
    I tried to buy one installed at build.... But not an option in my area. Dealer will install one for me later.

    I used the Grill Block pipe insulation this year. Top grill only.
    Worked better than without. 10-20 degrees+.
    Around the radiator, and the shutters aren't sealed very well.
    I'm thinking of sealing this area better. Possibly rubber liner in front.
    Reducing the cold air in the compartment.

    I have found that the fullest battery stops the gen drain completely.
    Giving me the best driving mileage of all methods.
    Cold or Warm.
    Watch how high your battery will stay charged in Cruise Control for example.
  7. rfruth

    rfruth Well-Known Member

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