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TRD radiator cap

Discussion in '1st Gen. Tacomas (1995-2004)' started by Oat, Jan 20, 2012.

  1. Jan 20, 2012 at 6:24 AM
    #1
    Oat

    Oat [OP] Well-Known Member

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    Do they really even help at all? i'm looking at 21.3 PSI vs 18.5 PSI. They claim it helps raise the boiling point of coolant. Is lower or higher PSI better when it comes to the caps?
     
  2. Jan 20, 2012 at 6:29 AM
    #2
    KPT

    KPT sees what you did there.

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    I'm not saying this is going to affect anything to do with the efficiency of the cooling system, but scientifically, higher pressure does increase the effective boiling point of a liquid.
     
  3. Jan 20, 2012 at 6:31 AM
    #3
    Oat

    Oat [OP] Well-Known Member

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    So 21.3 PSI should have a high point than 18.5 psi...its weird because 18.5 costs more.
     
  4. Jan 20, 2012 at 6:31 AM
    #4
    Oat

    Oat [OP] Well-Known Member

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    Anyone know the PSI on stock cap?
     
  5. Jan 20, 2012 at 6:34 AM
    #5
    goomba

    goomba It is a Fluid Situation

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    It is not like you are ganna get close to the boiling point. Unless ur driving down the interstate in 3rd gear with rpms at 5 grand.
     
  6. Jan 20, 2012 at 6:41 AM
    #6
    goomba

    goomba It is a Fluid Situation

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    I have a 13lb cap on mine.
     
  7. Jan 20, 2012 at 6:57 AM
    #7
    Pugga

    Pugga Pasti-Dip Free Since 1983

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    x2. Higher pressure = higher boiling point. As long as you're not running water-diluted coolant, you shouldn't come close to boiling your coolant. What's the benefit of the higher boiling point? :confused:
     
  8. Jan 20, 2012 at 7:10 AM
    #8
    Oat

    Oat [OP] Well-Known Member

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    Eh I just like the thought of having higher pressure being that i do alot of interstate driving between job sites in the summer time in florida. temperature can get 95F
     
  9. Jan 20, 2012 at 7:16 AM
    #9
    Pugga

    Pugga Pasti-Dip Free Since 1983

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    Unless you're towing, I wouldn't worry about. At highway speed, the engine will say cool.
     
  10. Jan 20, 2012 at 7:21 AM
    #10
    jeremy_283

    jeremy_283 Super Member

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    I'm not sure if it will apply to this but on my KLR650 I have a Thermo-Bob installed which has basically modified the cooling system in multiple ways. One of which is to increase the temperature of the thermostat because I have read online that the stock thermostat opens to soon (low heat range 160-170 degrees) and causes fluctuations in the engine temperature which can "supposedly" cause cylinders to go out-of-round and create oil burning issues. That being said oil burning is a pretty severe problem with the KLR in it's factory form and a 685cc kit is recommended which is what I have. I have also installed a Thermo-Bob as well. :D

    To read a review of the Thermo-Bob look here
    http://www.klrworld.com/index.php?option=com_content&task=view&id=193&Itemid=286
     
  11. Jan 20, 2012 at 8:03 AM
    #11
    05RedTaco

    05RedTaco Nom Nom Nom

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    Water actually has better heat transfer than coolant. When I had my Turbocharged 2.5L Sentra I ran straight distilled water with Redline water wetter. The only good thing about coolant is that it won't freeze...
     
  12. Jan 20, 2012 at 8:08 AM
    #12
    Pugga

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    There's a lot more to it than that. Water absorbs heat slower than straight coolant so it takes a longer time to get water to it's boiling point but straight coolant has a higher boiling point. If running a straight coolant system, you'd need to increase the flow rate so it doesn't boil when passing through the engine. On the flip side, when going through the radiator, water will shed heat slower than straight coolant also. There's more advantages to running coolant/water mixtures than just the lower freezing point.
     
  13. Jan 20, 2012 at 2:23 PM
    #13
    4WD

    4WD cRaZy oLdmAn

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    The rumors are true, they DO exist, I've only seen one on this forum.....mine..:D


    dont know if it helps but theres a "15" on the right side of cap.. psi ??


    [​IMG]
     
  14. Jan 20, 2012 at 4:00 PM
    #14
    Tennessee01Tacoma

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    It's actually 1.5 bar which is 21.75 Psi stock is 13 Psi or .9 bar now you know lol
     
  15. Aug 14, 2012 at 10:50 PM
    #15
    aportis72

    aportis72 Well-Known Member

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    No its not Bar its kg/cm this equals 18.5 same as stock. You can get a 21.3 TRD one
     
  16. Aug 14, 2012 at 10:55 PM
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    t4daddy

    t4daddy Well-Known Member

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    I think that's measured in atmospheres.
     
  17. Aug 15, 2012 at 9:03 AM
    #17
    aportis72

    aportis72 Well-Known Member

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    I just bought one it's says kg/cm right in the pakage
     
  18. Aug 15, 2012 at 12:39 PM
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    Buell

    Buell Go BIG or Go HOME

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    Mine says 1.3, what does that mean?
     
  19. Aug 15, 2012 at 12:42 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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  20. Aug 16, 2012 at 12:06 AM
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    SRQ TACO

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    I also run the Redline Water Wetter in my truck and it stays just below the middle point on the temp gauge. I recommend that stuff to anybody!
     
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