Heat Management

Discussion in 'Z32 Technical' started by J3bba, Apr 17, 2019 at 2:48 PM.

  1. J3bba

    J3bba He Who Struggles

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    Hi all.

    I've just finished my rebuild with new turbos, cams, etc and finally got it tuned Monday (329kw at the wheels if anyone's wondering, I'm stoked:D).

    Been driving it around a bit and water and oil temps have been getting highish. Nothing catastrophic but a little higher than I'd like considering it was only 29ish degrees outside and I wasn't pushing too hard.

    I wanted to start a discussion about what other people have done to manage the extra heat. I'm talking undetbonnet temps, water temps, oil temps, everything.

    Let me and others learn from your experience. :)
     
  2. MagicMike

    MagicMike Mod and Event Coord [QLD] Staff Member

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    What temps are you seeing? And where are the sensors?
     
  3. J3bba

    J3bba He Who Struggles

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    Water temps got to high 90's in the upper radiator hose.
    Oil temp got to low 100's in the oil filter tree.

    Like I said, nothing too high, but considering I was just driving sedately on a warm day it's a bit higher then I'd like. Especially seeing as I plan to push it a bit harder at the track.
     
  4. Shane001

    Shane001 Well-Known Member

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    First question you're gonna be asked, what fan are you using ;)
    Bigger oil cooler will help.
    Ducting the radiator intake will help.
    Are your running a FMIC or SMIC's. Remove FMIC and run SMIC's will help.
     
  5. J3bba

    J3bba He Who Struggles

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    Running stock clutch fan, not planning on changing from that, from what most people say it's the best anyway. Running Godspeed SMIC.

    What do you mean by "ducting the radiator intake"?

    Just replacing the stock cooler with a larger one and using stock lines, will that work?
     
  6. Shane001

    Shane001 Well-Known Member

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    From the front bar opening back to the radiator, block it all in so all the air coming into the front bar HAS to go through the radiator, can't go anywhere else. Air will follow the path of lease resistance.

    Replacing the stock cooler with a larger one will help a little, but this is only cooling the bypass oil. Better to leave this and add a second cooler with a sandwich plate so all the oil going to the engine is also cooled.

    I'll be posting up pics in the next month or so of how I've done this on my racecar.
     
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  7. IB

    IB ?????

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    Is that with AC on?

    Maybe try a cooler thermostat? I believe Nismo make a cooler one.
     
  8. J3bba

    J3bba He Who Struggles

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    AC off, a Nismo thermostat is probably a good idea.
     
  9. East Coast Z

    East Coast Z Well-Known Member

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    Additional horse power over stock will produce more heat.
    That's how it works.
     
  10. J3bba

    J3bba He Who Struggles

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    Looking forward to the pics. Was it relatively straightforward? Did you need to do much fab work?
     
  11. J3bba

    J3bba He Who Struggles

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    Yeah, was expecting a bit more heat. Just trying to find out how other people have dealt with it.
     
  12. East Coast Z

    East Coast Z Well-Known Member

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    The only practical solution is to install a larger capacity radiator.
     
  13. Fists

    Fists Well-Known Member

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    If you're driving sedately the engine isn't really making any more power than the camry next to you. Unless you're understating how you were driving you have a fault you need to fix you don't need upgrades.
     
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  14. J3bba

    J3bba He Who Struggles

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    What are other people running with regards to aftermarket radiators?
     
  15. J3bba

    J3bba He Who Struggles

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    What about underbonnet temps? Has anyone used turbo blankets/heat wrap/bonnet vents etc to deal with that?
     
  16. rob260

    rob260 Moderator Staff Member

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    Have you tried the basics ie bleed system etc? It really shouldn’t be overheating under the conditions described.

    Assume you are running a stock water pump pulley and fan etc?
     
  17. J3bba

    J3bba He Who Struggles

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    Bleeding is ongoing. After every drive I'll top it up a little but it seems to be more or less bled.

    Yeah, I'm running a completely stock cooling system.
     
  18. rob260

    rob260 Moderator Staff Member

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    If you’re topping up after each drive I’d start by bleeding it properly.... heater on, elevate the front end, put a funnel on it (half a coke bottle with plumbers tape works just as well) and let it do it’s thing for a bit.

    May not solve all your problems but won’t not help.
     
  19. Shane001

    Shane001 Well-Known Member

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    That's not bleeding. As Rob says, you need to mount a coke bottle upside down in the radiator filler neck, needs to be sealed at the radiator neck so it doesn't leak, then run the car up to temp just idling, then run it at around 3000rpm for several minutes, let it idle for a bit more then shut it down and let everything cool back down before topping up if necessary and putting the radiator cap back on.
     

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