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towing mg1 mg 2 temp upper limits aux inverter cooler gen 3

Discussion in 'Gen 2 Prius Technical Discussion' started by Glen2007, Mar 1, 2018.

  1. Glen2007

    Glen2007 Junior Member

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    2007 215k inverter trans fluid changed 20k ago. Plan tow uhaul 4x8 trailer total weight around 1500 #s.
    Ordered gen3 inverter cooler plan to plumb in mount in upper bumper slot. The cooler weather first week of march should help. Avg high 45 low 30. I plan to test first rent trailer go on highway watch temps see if I want to tow or not. Safe temps for mg1 and mg2 ? Mg1 seems to run hotter by all threads read next to ice. thanks

    https://priuschat.com/proxy.php?image=http%3A%2F%2Fmastertechmag.com%2Farticles%2F2010%2F01jan%2Fimages%2Finverter1_coolingsystemL.jpg&hash=5f84359d90bcfd3e156b09fc940110bb

    I am thinking about splicing into the line coming out of the existing cooler.

    interesting I know the gen3 has more power Gen 3 Towing a Uhaul 5x8 | PriusChat
     
    #1 Glen2007, Mar 1, 2018
    Last edited: Mar 1, 2018
  2. Glen2007

    Glen2007 Junior Member

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    I got all of the air out via stock bleeder. Not sure if I had an air bubble so I added a t to make an additional bleeder point. 46 f out and the only real heat I feel is a small amount down by the fluid controller. Ill find something better than the extension to cap the bleeder. Everything is just rough plumbed for now. Ill probably get some bendable metal then bend the zip tie to hose to make a no kink curve. ILL get my elm327 for engine link to see mg temps 3/3/18 etc.

    The flow is out line from stock cooler spliced into gen 3 cooler then back into inverter. I do not feel any heat on the new cooler lines. But there is flow verified at the new T. 2004-2009 Toyota Prius Coolant Control Valve GENUINE TOYOTA OEM NEW 16670-21010 | eBay
    It appears to me that I am asking questions from others that in the near future I will be able to answer myself by observation.
     
    #2 Glen2007, Mar 2, 2018
    Last edited: Mar 2, 2018
  3. Glen2007

    Glen2007 Junior Member

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    Fig. 3.17. Maximum torque-speed performance specifications for the 2004 Prius.
    Other important specifications include those listed in Table 3.14.
    Table 3.14. Cooling and coolant temperature and flow limits
    Parameter Limit Basis Maximum temperature of cooling oil (°C)~160–170
    To support effective winding cooling Maximum temperature of stator winding (°C) 200
    Elevated limit – see text below Normal temperature of coolant (°C)65
    Typical, measured coolant temperature (°C) 55
    In the Prius vehicle, the stator-thermal protection is set at 174 C, which indicates that Toyota is protecting the winding as if it is a Class H motor winding. Class H allows operation at up to 180°C for an average life of 20,000 hrs.
    Well since its trans fluid my guess anything over 180 f could be a problem 220 f + great concern.
    http://k0bg.com/images/pdf/890029.pdf
     
    #3 Glen2007, Mar 2, 2018
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  4. edthefox5

    edthefox5 Senior Member

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    I think what your doing is adding an auxiliary cooler to the Inverter coolant system. Your posts are so poorly written its hard to decimate. Too bad as it looks interesting. I always thought if you could lower the Inverter coolant temperature you could improve Inverter efficiency and get better mileage and increase the life of the trans. I think thats what Toyota found also as in the G3 which has a separate Inverter coolant
    radiator outside of the engine coolant radiator so no engine coolant heat couple. I did some IR thermometer tests years ago and found the Inverter loop on the G2 is pretty good keeps it about 30 degree's cooler than the the engine 180F but when you turned the car off the coolant radically spiked in temp due to heat coupling I surmise. At least down here in Florida. I entertained years ago to try to do what i think your doing but found no available room under the hood to install anything. Its really tight under there. It was difficult to install an air horn and power replay.

    And not sure what your reference is to the 3 way coolant valve as that is only for the engine coolant loop.
     
    #4 edthefox5, Mar 3, 2018
  5. Glen2007

    Glen2007 Junior Member

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    The g3 cooler is installed in the front bumper lower opening.
     
    #5 Glen2007, Mar 4, 2018
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  6. edthefox5

    edthefox5 Senior Member

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    I thought about that but it would block the existing condenser/radiator system.
    I was always thinking of a an aux electric fan cooling it.

    Pictures.
     
    #6 edthefox5, Mar 4, 2018
  7. Glen2007

    Glen2007 Junior Member

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    • extra cooler is mounted to front bumper far forward of the condenser.
     

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    #7 Glen2007, Mar 4, 2018
    Last edited: Mar 4, 2018
  8. edthefox5

    edthefox5 Senior Member

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    Yeah but how much of the condenser/rad is being blocked and also...

    It will do little heat exchange just being in the wind you need a fan behind it sucking for positive air flow. Just sayin'.

    And you cannot block the condenser/rad in high heat areas like mine. Its brutally hot here with high humidity but may get away with it in Chicago but doubt it in this new environment we live in where hot is now freakin' hot.

    Careful blocking the rad. Its a pretty finely tuned system cooling wise. I would not experiment blocking that without a Scan gauge engine temp monitoring.

    Poor heat exchange on the existing condenser because you re now blocking it causes high heat in the compressor: $$$$
     
    #8 edthefox5, Mar 4, 2018
    Last edited: Mar 4, 2018
  9. Glen2007

    Glen2007 Junior Member

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    G3 inverter cooler configuration cost 0 energy on inverter no fan no draw.
     
    #9 Glen2007, Mar 5, 2018
    Last edited: Mar 5, 2018
  10. edthefox5

    edthefox5 Senior Member

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    Great. Won’t do much just sitting in the wind. Needs positive fan flow. And doesn’t matter how far forward it is placed it’s blocking the bumper inlet.
    Way too hot in the summer to block even small inlet area. The ac condenser will pay a price. Cooling systems and airflow is quite critical
     
    #10 edthefox5, Mar 5, 2018
  11. Glen2007

    Glen2007 Junior Member

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    ok
     
    #11 Glen2007, Mar 5, 2018
    Last edited: Mar 6, 2018
  12. Glen2007

    Glen2007 Junior Member

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    Chicago to Phoenix u haul 4x8 trailer scaled at 5200 # avg mpg 25 mg1-2 highest temps 155

    mg1-2 temps averaged 90 f over ambient
    40 f =135 mg1-2 temps
    in Phoenix 88 f outside temp flat highway 60 mph = 155 mg1-2 temps
     
    #12 Glen2007, Mar 10, 2018
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