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Thermostat Poll

Tungsten

By Tungsten,
in The Garage

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8 members have voted

  1. 1. What thermostat do you run?

    • Over 180 F (82.2 C)
      0
    • 180 F (82.2 C)
      3
    • 175 F (79.4 C)
      0
    • 170 F (76.6 C)
      5
    • Under 170 F (76.6 C)
      0
    • No thermostat
      0

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Tungsten NPORA Old-Timer

Tungsten

Posted
Posted (edited)

This might be stupid but I want to know what thermostat does everyone have. I have a 180 F (82.2 C) one and it does seem to be on the warm side in this climate (NJ). It seems fine but maybe I should change it for a 170 F (76.6 C) one next summer. :scratchhead: I think Nissan sells a 76.5 C (around 170 F) one for the VG30E.

Edited by Tungsten
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Kingman NPORA Old-Timer

Kingman

Posted
Posted

I've got a 180F, 170F allowed the electric fan to cool everything too much and made my needle sway a lot. The needle is dead in the middle of the gauge when warmed up and rarely sways.

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Tungsten
NPORA Old-Timer

Tungsten

Posted
  • Author
Posted

So I'm guessing anywhere between 170 F and 180 F is good. What is the engine operating temperature then? My gauge is also stays dead in the middle when the truck warms up.

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Kingman NPORA Old-Timer

Kingman

Posted
Posted

Optimal running temperature is 180F. Warm-up ends at 150F, and a bad thermostat can keep the temp low enough to make the engine run in open loop. Before I replaced the thermostat, going down long hills in the cold the temp gauge would go down to almost cold. Was very annoying.

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MY1PATH NPORA Old-Timer

MY1PATH

Posted
Posted

Where did you find out about the optimal temp? I never saw anything in the FSM. scratchheadyellow.gif

 

 

Its a NA VG thing not a FSM thing. 175-185 is the optimal coolant temperature on these designs to maintain an optimal combustion temperature. The combineation of a

170 t-stat and clucth fan allow it to reach that.

Trubo VG's produce more heat inside the cyl so 165-175 coolant temperature helps maintain the same combustion temperature. They also recieve 170 thermostats and are fine with that unless bost is increased over stock.

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  • 10 months later...
Tungsten
NPORA Old-Timer

Tungsten

Posted
  • Author
Posted

Just put in a 76.5 C (~170 F) thermostat from Nissan and now my temp is perfect even if the A/C is working. With a 180 F one, the needle would go into the middle and point straight up and sometimes go a hair over. So it looks like the factory temp one works better for my climate.

 

314484_10150305375359075_612879074_7935717_1093692136_n.jpg

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adamzan NPORA Old-Timer

adamzan

Posted
Posted

I have a 170 and I find on the real cold days the heat isn't as hot as I'd like it to be, but I am worried that with a 180 it will overheat with the air con on in the summer, as with the 170 I've seen the temperature rise to almost 3/4 on the guage but it normally sits at a 3rd of the way up.

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Tungsten
NPORA Old-Timer

Tungsten

Posted
  • Author
Posted (edited)

I don't know why the temp on your truck rises so erratically. If I had to guess I would say it's running way too lean or the fan clutch is bad or maybe the cooling fins are clogged.

Edited by Tungsten
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Trogdor636 NPORA Old-Timer

Trogdor636

Posted
Posted

I have a 170 and I find on the real cold days the heat isn't as hot as I'd like it to be, but I am worried that with a 180 it will overheat with the air con on in the summer, as with the 170 I've seen the temperature rise to almost 3/4 on the guage but it normally sits at a 3rd of the way up.

 

I have a 180, and even with the 100 degree days here and the A/C cranked my temp never hits halfway.

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sewebster NPORA Old-Timer

sewebster

Posted
Posted

I have a 170 and I find on the real cold days the heat isn't as hot as I'd like it to be, but I am worried that with a 180 it will overheat with the air con on in the summer, as with the 170 I've seen the temperature rise to almost 3/4 on the guage but it normally sits at a 3rd of the way up.

 

Maybe you need a new radiator?

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sewebster NPORA Old-Timer

sewebster

Posted
Posted

Yeah, makes some sense. On my other car I had some weird temperature fluctuations, but I didn't know what the problem was. Eventually the car would occasionally overheat in traffic. Finally at some point the radiator sprung a leak and I replaced it. Then all my weird temperature stuff went away.

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