Engine out

Discussion in 'Non Technical' started by pexzed, Jun 21, 2011.

  1. pexzed

    pexzed Forum Administrator

    Well the engine's out.
    Found out that my turbo set up has no water cooling, just oil cooling.
    No bastard turbo hose to leak :D, although I'll have to change my oil more often now that I am aware of this (Thanks Mitch for the sump tap). Eric loves it too :p

    With any luck, I'll get a chance to get some photos with the manifolds and turbos/dumps /wastegates attached to the engine before it goes back in to show you all what a weird set-up it is.

    Eric is doing 100K service and plenum pull to check/fix the oil leaks from the cam covers/solenoids/gears while the engine is out of the car. May as well do it while it's all easy to get to :)

    I've seen the holes I blew in the manifold gaskets, no wonder the poor gal sounded like a tractor :rofl: BOOOOOOOOOOST!!

    Now, for the questions for you all.

    Since I have no water cooling to the turbos, and My oil is cooking in the turbos more than the average turbo (no water cooling, and more heat/power than standard setups), any thoughts on whether I should go with the cooler NISMO thermostat to try and help keep it all a bit cooler???.

    I have NISTUNE, so I can lower the temperature thresholds where the car alters it's tune for cold coolant temps should it want to sit cooler than 70 degrees.

    Anyway, no flame suits required, all input greatly appreciated in advance.
  2. brisz

    brisz Well-Known Member

    If you haven't had any problems with coolant temperature so far I don't see the point, you will just end up running at lower then desired operating temperature, look at a synthetic oil that is more resistant to heat damage, and maybe increase the stock oil cooler size.

    Also consider better air cooling ala GTR R35, ducted bonnet vents, I have been looking at it but there is just no where for bonnet attached ducts to slip in, had been considering XA GT NACAS, because of there near flush fit, they would also vent outwards when parked, but in motion would increase air flow in the back corners and down the firewall.

    Don't think they can be fitted with out modifying the bonnet support structure, potential defect.


    I think this is Tekky's, a longer skinny NACA maybe.

  3. Chrispy

    Chrispy Pretentious Upstart

    I wouldn't be too worried about it. Proper oil cooler if the oil temp is getting too hot. You got a gauge for oil temp?
  4. tassuperkart

    tassuperkart Its a lie I tell you!

    There are a legion of non watercooled turbos around.
    They dont stress the oil anymore than anything else. Watercooling is an effort to allow a turbo engine to be immediately shutdown after a hard run.
    "If" the setup has been designed well, the water should continue to circulate thru the turbos via thermosyphoning

    Youd think about upgrading oil cooling systems IF the oil temps are NOT under control.

    Cooler thermostats, no.

  5. brisz

    brisz Well-Known Member


    So with out "thermosyphoning" would you have more aggressive post shutdown heat increase of the oil/bearing in the turbo ?

    I know that journal bearings are more effected by this but it cant be great for BB either.



    A reference in the FSM to "Precautions for Turbocharger".

  6. tassuperkart

    tassuperkart Its a lie I tell you!

    You still have the body of water within the turbo housing drawing heat way from the innards.
    The circulating water is the key.
  7. Benny_C

    Benny_C About as subtle as...

    ^^ This ^^
  8. a2zed

    a2zed Guest

    Copy of the pm I sent Greg last night, as you can see I agree with what has been said.

  9. zxy-beast

    zxy-beast Member

    Yep agreed.. lower temp thermostat will not do anything good/useful. This was a common request at NATRAD and we pretty much had a spiel formed to explain it which is effectively as has already been stated.

  10. pexzed

    pexzed Forum Administrator

    STD thermostat it is then :)

    many thanks :)
  11. AndyMac

    AndyMac Better than you

    I wouldn't concern yourself too much Greg unless your oil temps are getting too high. Even then, doing modifications to the cooling system won't gain you anything. You'd want to look at a larger oil cooler, or heat exchanger, or possibly something like acusump to allow you to push oil through after shutdown. Your not going to get any problems with oil flashing in the turbo's while running, and it needs to be pretty freaking hot for it to do it on shutdown.
  12. Adamness

    Adamness Active Member

    Sorry to bomb your thread pex but since your question has been answered I don't feel so bad :p

    "the engine has far less wear around 80-94 degrees than at 65-80 degrees"

    Eric is that oil temp or coolant temp?

    My Coolant temps normally run from 72-86 (according to ecutalk display with brand new coolant temp sensor) depending on how "spirited" my driving is and ambient temperatures.

    My car used to run hot, 86-105...but i changed fan clutch and cleaned out std oil cooler and its dropped significantly


  13. rob260

    rob260 Administrator Staff Member

    I'd stay away from heat exchanger unless youre planning on running an external cooler as well. At the moment the heat exchanger is disconnected on my car and I'm using an external setrab cooler -coolant temps have dropped significantly.

    I like the theory behind the heat exchanger -will try running it in series after the external cooler and see how that goes at some stage. Still playing with it!

    So yeah Greg/pex big no to heat exchanger but a quality external cooler could be a good move. You might not need it now but they're not overly expensive and it'd be good insurance for track or strip where you KNOW that oil's going to get pretty warm...
  14. AndyMac

    AndyMac Better than you

    Don't write off heat exchangers Rob, I've found in the past those inbuilt into radiators are too small, but seperate heat exchangers are very good at keeping oil temps consistent even in track use, but need to get something of decent size. In the zed, external oil coolers often work better as you can put them directly into the flow of air, but if you want to put it in a position where air flow is minimal, then a heat exchanger is the go.
  15. tassuperkart

    tassuperkart Its a lie I tell you!

    Water to oil heat exchangers have a couple of very distinct plusses.

    One is there relatively small size and can be mounted anywhere.

    Second is a property which so may dudes fail to see. Not only do they cool oil, but they also HEAT the oil!.

    Water temps rise very very quickly compared to oil temps. There is NO secret at all that running oil temps too cool is detrimental to engine life.
    The O to W heat exchangers help by heating the oil as it passes thru when cold. This is a bloody good thing regardless of the climate. Also they tend to "hold' oil temsp up around the ideal range for oil which is around 100Deg.C

    A to O external coolers should be placed in front of the radiator to work at all and then they restrict airflow to that part of the radiator.
    In cold conditions, the oil never really reaches operating temps unless an oil temp thermostat is installed. These thermostats work really well but add complexity and cost.


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