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Water Temp

FJ20DR30
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FJ20DR30 Community Regular

FJ20DR30

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Is there a speceific reason you would want this information?

lol yes there is.. my cars factory gauge sender is not working and since then i have fitted an aftermarket gauge with the sender mounted where there old factory sender was..

now.. my car has a large VN or VR commodore radiator fitted to it and because of this i think the car runs to cold.

so i can tell if it does, i need to know what it should be. and if it is i need to restrict the airflow to the radiator.. all of this i cant do with out knowing what the temp should be.

now my thoughts are that factory temp would more than likely be around 80 to 95 degrees ???

now the temp im getting is well under that and the fans dont ever come on hence why im sure its running to cold..

as you can see i cant set it up correctly with out knowing what it should be.

Marc

Edited by FJ20DR30
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Ghostrider Grand Master

Ghostrider

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You ever consider the ambient temperature in Melbourne these days is BLOODY cold. My Cressida at the moment is struggling to get to running temperature due to the ambient air temperature being so low this time of year.

If you think your running to cold, change the thermostat for one thing.

I think your worrying to much, your not on a race track?

D

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FJ20DR30 Community Regular

FJ20DR30

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You ever consider the ambient temperature in Melbourne these days is BLOODY cold. My Cressida at the moment is struggling to get to running temperature due to the ambient air temperature being so low this time of year.

If you think your running to cold, change the thermostat for one thing.

I think your worrying to much, your not on a race track?

D

not a new problem

i just want the temp!

Edited by FJ20DR30
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FJ20DR30 Community Regular

FJ20DR30

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they also wear more..

its important that the car runs at the correct temp not least for fuel economy and wear!

cold engines dont make more power! optimum temp cars make more power!

also im not stressed about it guys i just want it right! is this to much to ask?

sorry for the grump bt its not a hard qestion if someone knows the answer.

Marc

Edited by FJ20DR30
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Ghostrider Grand Master

Ghostrider

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I don't think there is an answer Marc, that's why I chose to go the way I did with it.

I have searched the RS JDM brochures I have + S130 n/a & turbo service manuals, R30 service manuals & looked on FJ20.com and they don't give a specific optimum engine running temperature, everything talks thermostat temperatures.

It is my understanding in any cooling system, that it wouldn't matter if your radiator was 10ft wide and held 1000L of coolant, it's ultimate operational temperature is controled by the thermostat.

The normal standard OEM thermostats operate between 76.5 & 90 degrees C. That's opening at the lower and fully open at the higher temperature and if you want the engine to run hotter, fit a (hotter) later opening thermostat. And remember the boiling temperature is controled by the pressure in the radiator. If you have a stock 0.9 cap, then boiling is going to be about 120 degrees C, but if you have a trick 1.3 cap, then your boiling point will be about 130 degrees C.

Does this help?

Cheers, D

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mad082 Grand Master

mad082

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as someone said above, a bigger radiator shouldn't alter temps, but a dodgy thermostat will. most cars generally run between about 80 to 95 degrees, depending on the type of car, etc. if you aren't seeing temps of at least 75 degrees, and it takes more than a few kms to reach operating temp, then i'd say that your thermostat isn't working properly and you should replace it.

actually i just re-read what you wrote. you said that you are getting readings from ther thermostat housing. is that where the stock gauge got it's reading from? i know that on the rb25 that it gets its reading from the other water outlet and not the thermostat housing, as the thermostat housing is the water inlet (has the water coming out of the radiator that has been cooler, but hasn't been heated up by the engine yet). if the fj motor is setup like the rb25 (and i'm guessing the other rb motors) then that will be the cause of your lower water temp readings. you aren't reading what temp the engine is, but what temp the water is after it has been cooled by the radiator.

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FJ20DR30 Community Regular

FJ20DR30

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as someone said above, a bigger radiator shouldn't alter temps, but a dodgy thermostat will. most cars generally run between about 80 to 95 degrees, depending on the type of car, etc. if you aren't seeing temps of at least 75 degrees, and it takes more than a few kms to reach operating temp, then i'd say that your thermostat isn't working properly and you should replace it.

actually i just re-read what you wrote. you said that you are getting readings from ther thermostat housing. is that where the stock gauge got it's reading from? i know that on the rb25 that it gets its reading from the other water outlet and not the thermostat housing, as the thermostat housing is the water inlet (has the water coming out of the radiator that has been cooler, but hasn't been heated up by the engine yet). if the fj motor is setup like the rb25 (and i'm guessing the other rb motors) then that will be the cause of your lower water temp readings. you aren't reading what temp the engine is, but what temp the water is after it has been cooled by the radiator.

the new gauge sender is where the factory oem one was on the side of the thermostat housing

there is a sender for the computer on the top thats still there and pluged in

ill chuck in a new Thermostat for measure

Edited by FJ20DR30
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66yostagea Grand Master

66yostagea

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All told I've had four R30s. Even when new the temp gauge never even got to mid way even on very hot days. What I have done with my RB25DET is fit a good quality oil temp gauge. Max on that with a flogging is about 105-110C.

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stagefumer11 Rising Star

stagefumer11

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All told I've had four R30s. Even when new the temp gauge never even got to mid way even on very hot days. What I have done with my RB25DET is fit a good quality oil temp gauge. Max on that with a flogging is about 105-110C.

that sounds about right.

Also remember antifreeze/coolant also changes the boiling point of water

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66yostagea Grand Master

66yostagea

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that sounds about right.

Also remember antifreeze/coolant also changes the boiling point of water

Dont forget the pressure. It is important to have the correct radiator cap. Different caps, different pressure.

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