lower temp thermostat replacement?

rodama5anthony

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Sep 24, 2010
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i was reading somewhere on the forums a few months ago about using a lower temp rated thermostat from another car. I believe this thermostat was rated at 80 degrees Celsius anyone know what car this comes off?
 

hvyman

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Better to just use the stock 190. If you go to low you will put the engine in warm up enrichment mode.

But if you really want to do that you can just go to autozone or something and they should have different degree stats.
 

rodama5anthony

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alright thanks for the info hvyman. i wasnt planing to go all that much lower stock thermostat is rated from about 85-90 C and was thinking of finding on rated about 80C but i pretty sure i cant just pick any thermostat off the self cus their made in different styles arent they?

---------- Post added at 11:31 PM ---------- Previous post was at 11:25 PM ----------

oh lol never knew orielly had such a variety of thermastats....
 

mecevans

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Jan 18, 2009
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Just recently someone asked the same thing. With a lower temp thermostat they actually saw no drop in coolant temp. Better off spending that money and time to drain coolant on an aftermarket rad.
 

rodama5anthony

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lol i was planning on installing the after market rad and thermo at the same time this weekend

---------- Post added at 11:53 PM ---------- Previous post was at 11:52 PM ----------

i mean might as well changed the thermostat if imma have the coolant drained and i have no idea when it was last changed
 

CyFi6

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OEM stat is the way to go unless you are in a VERY hot climate (110+), then a slightly lower stat can give you some headroom (wont stop you from overheating if you already are, will just delay how long it takes to overheat. A fully open thermostat is a fully open thermostat no matter what temp it is rated), but still is not at all necessary. I would throw in a new OEM thermostat or 190 degree SuperStat, preferably OEM. You should test it in a pot of water too before you use it, they have been known to be DOA or open at the wrong temp. If you run too low a temp thermostat you risk never reaching operating temp at all which is not a good thing.

As long as you get a stat with the same diameter (should be stamped on the thermostat itself) it should fit fine.
 
Last edited:

A. Jay

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CyFi6;1732022 said:
(...)A fully open thermostat is a fully open thermostat no matter what temp it is rated(...)

Exactly, I'm not sure what else people can possibly be picturing when they see a 160F thermostat for sale. If you have a 195F stat and your coolant is 220, you can throw in a 95F stat and it'll still be 220 (eventually lol but it'll get there).
 

te72

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Something else to consider, no matter how big or efficient your radiator is, your FAN is what does the hard part. If your fan system can't pull heat out, your radiator (no matter how fancy) is only going to be a big heat sink.
 

radiod

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A GTE clutch fan with the shroud and proper panels underneath to direct the air through the radiator properly is going to do more than a cooler temp thermostat could ever do. As other have said before, it's only going to delay overheating if there is an issue, not prevent it. A lot of people underestimate the difference proper airflow makes as well with the shroud.
 

tlo86

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better to just use oe stat. not sure if you'd want to wait extra long for your engine to warm up...
 

rodama5anthony

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thanks everyone for the input and info. I originally wanted to do this because i heard it helps if you are doing track/drift and my supra is not my DD but my weekend warrior
 

hvyman

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Good working mech fan and a big alum rad will do better. Also if your drifting/ road racing amke sure your running an extra qt of oil. I run one at all times.
 

rodama5anthony

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extra oil always even carry a qt in the car ... along with a gallon of coolant , bottle of break fluid, spare tire.... been meaning to get a fire extinguisher maybe ill ask my parents to get me one for my bday lol anyways big alum rad will be installed this weekend and mech fan will come in time since supra has decided that a new front rack is in order ( boots torn and fluid slowly leaking down form the boot and im guessing thats not normal) although the ps fluid in the reservoir doesnt seem to be dropping :confused:
 

hvyman

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If you do get a extinguisher if its mounted in reaching distance you can get a discount for insurance with proof that its there:)
 

te72

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hvyman;1732449 said:
Good working mech fan and a big alum rad will do better. Also if your drifting/ road racing amke sure your running an extra qt of oil. I run one at all times.
I believe he means to put that extra quart of oil IN your engine... in my experience with Supras, definitely a good idea. Probably would have saved my 7m had I ran it with that extra quart. :nono:

hvyman;1732481 said:
If you do get a extinguisher if its mounted in reaching distance you can get a discount for insurance with proof that its there:)
Good to know, thanks for the tip! Not a bad idea anyway, buddy of mine in AZ lost a really nice looking Mk4 to a fire on the roadside...
 

hvyman

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There used to be one in my car but idk if it works. Nor did i want to mess with the interior to mount it. Tho you could always do a temp mount then remove after the discount and just throw it in the truck.
 

te72

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Hmm... if I were mounting an extinguisher in my car, it would probably be attached with a simple bracket onto the driver side of the cage hoop. Or perhaps along where the driver side frame rail under the door is, if it were small enough to not get in the way. I'd be worried about it moving around though... don't want crap rolling under or near your pedals. ;)