MPG is improving

Discussion in 'Gen 3 Prius Fuel Economy' started by james nancy, Aug 10, 2021.

  1. ASRDogman

    ASRDogman Senior Member

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    Did you get the plugs out?

     
  2. james nancy

    james nancy Junior Member

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    I haven't done the work of cleaning the egr yet, and I haven't made up my mind. For me, this determination needs some details to happen. Maybe a friend's suggestion will give me inspiration and make my thinking gradually clear.
     
  3. ASRDogman

    ASRDogman Senior Member

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    I was refering to post #14, the transmission plug:
    "I stay at home and want to change the transmission oil today. The repairman found that the bayonet of the oil drain screw is damaged and can't be removed. At present, what I can think of is to unscrew it with a pipe wrench tool first. It's best to avoid knocking it with a hammer. If it can be disassembled, the oil drain screw needs to be replaced. This is a new problem.


     
  4. james nancy

    james nancy Junior Member

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    Thank you for your reply. I'm sorry that I misunderstood. I haven't changed the plug yet. I was lucky to find the maintenance record. I only drove less than 10kkm since I changed the gearbox oil last year, so I don't need to change the oil first.
     
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  5. Grit

    Grit Senior Member

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    thought letting tire changer shops do oil related jobs was bad, but repairman doing an oil change?
     
  6. james nancy

    james nancy Junior Member

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    The employees of the oil company here also change the engine or gearbox oil, and the working hours are not very expensive. The local people are very friendly and work meticulously, but the skills are average, so some jobs must be done by themselves.
     
  7. tony_2018

    tony_2018 Member

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    wheel bearings?
     
  8. james nancy

    james nancy Junior Member

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    Sorry i didn't understand what you mean
     
  9. tony_2018

    tony_2018 Member

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    Did you replaced your wheel. bearings?
     
  10. james nancy

    james nancy Junior Member

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    The wheels and bearings have not been changed. Although there is some resistance when it is set up and rotated, there is a whining sound in a certain speed range of slow speed. I am not quite sure that there is a problem with the wheel bearing. I have been delayed by other problems. I have not considered this problem carefully.
     
  11. james nancy

    james nancy Junior Member

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    I am very happy today because I replaced my high-voltage battery during the Christmas holidays. It took 1 afternoon and 1 day, and it was very busy. Since it is a second-hand battery unit, it is necessary to test the capacity and choose the larger capacity. Most of these battery units are from the second-generation prius, and the battery code is only one line, without the b3, b4, and b5 characters, because I think the second-generation battery life seems to be longer. Clamp the battery, use a regulated power supply to charge to 8.55v (4A charging), and use a 12v air pump (current about 8A) to discharge to 7.0v. The high capacity can be discharged for 25 minutes, and the lowest is about 15 minutes, so the capacity will basically be high At 2Ah (60 minutes/8A*2Ah). After a long test, load the car, restore the 12v terminal, restore the high-voltage battery socket, the battery is low-voltage loaded, and each unit is discharged with an air pump to 7.0v. Status, no-load will be higher, ranging from 7.37v-7.51v. After loading the car, the ice starts to charge for about 3 minutes, and the battery has about 4 bars. I ran on the urban highway for 1 hour, and the battery was basically no temperature (there was a warm feeling when I ran for 10 minutes,before), mpg 64.625 (27.5km/l), the road slope ratio was about 30%, and the rest was flat road , The speed is basically 50km/h, and the maximum is 65km/h. I feel that the power has not changed much, the ev driving distance has been improved, and the battery's absorption capacity for downhill regeneration has been improved (previously, the battery will be fully charged and the battery will start when it is fully charged), The mpg has increased, and the battery temperature has dropped significantly. The battery test will continue, and any problems will be described in subsequent posts.
    I have learned a lot of knowledge here, thanks to the help of friends in the forum.
     
  12. Abarnabe

    Abarnabe Member

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    Second generation modules usually have a slightly higher internal resistance than 3rd generation ones, to check the internal resistance you might use dr prius app
     
  13. AzusaPrius

    AzusaPrius Active Member

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  14. james nancy

    james nancy Junior Member

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    Yes, the internal resistance of the second-generation battery is higher than that of the third-generation battery.
    I don't have a Bluetooth connector that can be used with Dr. Prius, but I have other instruments that can detect battery parameters and fault codes. How to determine if the EGR system needs maintenance? I don't know how to start, can this be tested? Or information can be found by detecting the data stream?
     
  15. james nancy

    james nancy Junior Member

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    20211228_155103.jpg 20211228_155123.jpg Yesterday to today, one afternoon plus one morning, I circled the beautiful Fiji Islands to test the battery performance and also enjoy the beautiful scenery. The weather is not so good, most of the time driving in the rain, but there are not many vehicles on the road, so the weather did not affect the mood.
    This trip is about 500 kilometers long. It shows 644 kilometers. It was 135 kilometers before. The maximum speed limit on roads is 80 kilometers per hour. On the roads passing through some villages, the speed limit is 50 kilometers per hour. I have to comply with the regulations. The roads are rough. Asphalt roads are relatively noisy and have some resistance. The average speed is 40km per hour. The fuel consumption meter shows 28.2km/l (66.27mpg). This data is the accumulated value after repairing the battery. Due to the rush, I can’t remember to reset it. The oil price in Fiji is 2.75 yuan/liter. I added 70 yuan of oil, and about 20 yuan of oil left after returning, so the actual fuel consumption is about 27.5km/l. This is an estimate and will not be accurate. I think It is said that the performance now is better than before.
    The air conditioner was not turned on during the whole process, and the battery was not fully charged down the long slope. Regarding this, I don’t know if it’s normal or not. I’m not sure. The battery temperature feels a little bit when I touch the outer casing. It’s about 35 degrees Celsius, and the local weather is 25-30 degrees Celsius. .
    In the ev mode, when the battery is not fully charged, it can easily run 3km, the previous 2km or less. In addition, the speed range of EV seems to be as large as 70km (not in EV mode, it is the speed at which the throttle is lower than 50%, and the ice does not start). It used to be very difficult above 60km. This can’t be tested for a long time. Running too slowly may affect others.
    That's it, I am very happy that my car is rejuvenated.
     
  16. Mendel Leisk

    Mendel Leisk Sand Pounder

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    It's relatively easy to check the condition of the stainless steel pipe running between the EGR valve and intake manifold. If it's moderately bunged up with carbon, you can be assured that the rest (the EGR cooler in particular) may be worse. Next easiest in complexity is removal and cleaning of the intake manifold. Videos showing how to do both of those have been made by @NutzAboutBolts , and are linked in a pinned thread at the top of third gen maintenance forum.

    More info in my signature too.
     
  17. james nancy

    james nancy Junior Member

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    The egr system has not been disassembled and checked. The engine is running well. At present, the sound is soft and slight, there is no vibration, and the exhaust is very uniform. It seems that the egr valve step length test has been done before, and no abnormality was found. I doubt the method of testing the step length. Whether it is accurate, so I will disassemble the egr to check.
     
  18. james nancy

    james nancy Junior Member

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    At present, the mpg of this barrel of oil is about (29km/l), and the speed is relatively slow when driving in towns. This result is the latest data after replacing the high-voltage battery. I replaced almost all of the battery units last month, and I've reached 28km/l on the trip after that. There are a lot of uphills and downhills on the Fiji road, which may affect the mpg a little bit. Driving in the city, mpg can easily reach 30+km/l if you are very careful. The higher mpg I think comes from the high voltage battery performance and lower ride resistance.
     
  19. Mendel Leisk

    Mendel Leisk Sand Pounder

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    29 km/litre is equivalent to 68 miles/gallon (US), or 3.4 liters per 100 km, which is phenomenal for 2010. Even if it’s just displayed.

    this if this is sustainable, say for a tankful. Actually, this MUST be shorter runs, engine warmed, resetting the trip meter.
     
  20. james nancy

    james nancy Junior Member

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    To be precise, it is the result of driving with about 20 liters of fuel. Among these miles, I try to avoid short distances. Generally, each journey reaches 10 kilometers. Since it is in the city, the speed will not be very fast, and the energy of the battery can be fully used. , In addition, because it is a test, I admit that the accelerator will be relatively light, but in order to take care of other vehicles in the same class, it will not drive too slowly, and try to avoid reaching the power area. Some people can do 600 miles, even 700 miles 800 miles on a tank of gas, I think this generation of prius can achieve that level. This is related to driving habits, travel conditions, and vehicle conditions. I think in the future, if you gradually loosen the throttle control when driving, the fuel consumption will increase, and it may gradually return to a state close to the previous state. I like the linear, silky-smooth mechanical output when I slowly increase the speed. The combination of sound, vibration, ups and downs, and a slight back push is a joy.
     
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