Running Temp Issue

[iruvyouskyrine]

Hi All,

RB25/30 with all coolant lines blocked/removed (only have turbo water feed and radiator in/out)

Greddy FFP

PWR radiator

So basically my issue is that no matter what thermostat I run my operating temperature is always 84 degrees.

Have run an 82deg, 76deg and 65 deg genuine Nissan thermostats and it always gets up to 84deg and just sits there happy as. The 76 and 65 thermostats were not brand new. Second hand with unknown k's but looked in good condition.

I have used both clutch fan and thermo fans with no difference. Weird that it always ends up sitting at the same temp no matter the thermostat.

Any advice appreciated as to how to fix this issue, thanks.

[Ben C34]

Have you checked the gauge with a different one?

[iruvyouskyrine]

Yeah ECU and separate water temp gauge read the same.

[Ben C34]

Well that's pretty freaky.

Not really a problem I suppose.

I would test the thermostats in a pot in the stove for some answers!

[iruvyouskyrine]

Both are plumbed in to the plenum though, not that it should matter.

[iruvyouskyrine]

All thermostats work as advertised in a pot of water. That's why it's such a head scratcher for me.

I know 84 is probably pretty good but car does get a little hot and was wanting some more headroom for Queensland drift matsuri as it's going to be hot as f**k up there.

[Dose Pipe Sutututu]

Wow interesting, I run a 67 degree Tridon "high flow" thermostat and she runs about 72 to 75 normal operating temp.

Time for no thermostat, since track car right? Lol

[MrStabby]

Wow interesting, I run a 67 degree Tridon "high flow" thermostat and she runs about 72 to 75 normal operating temp.

Time for no thermostat, since track car right? Lol

I've heard a couple of people (one was a largish workshop) say you should never run without a thermostat because it has an effect on the water pump's operation. Apparently running a gutted thermostat is ok tho (if you're not worried about the startup/cool running implications)...

[KiwiRS4T]

I would think 84 deg is fine. Do you have an oil cooler for track use?

[tridentt150v]

You did the gauges, what about the sender unit/s???

[Dose Pipe Sutututu]

I would think 84 deg is fine. Do you have an oil cooler for track use?

You'll he surprised how fast it hits 100.

The more head room you have the better, I find that now I've swapped to a lower temp thermostat and adjusted my temp tables to suit (65 degrees is when all my fuel compensations are disabled) I'm able to do more hot laps at Wakefield before it gets a little too hot.

[iruvyouskyrine]

Considering I have some (apparently useless) thermostats here, how should I gut them? I would be happy to run no thermostat if it comes to that but if it's better to take half the internals out I will just do that.

No I have not tried multiple senders but that's something I could do. I trust the current one though, has worked perfectly for ages and goes up and down with the temp. It's just that the base temp is above what it should be is the issue.

Might go grab a brand new tridpn one from repco and I may be able o take it back if it is the same as I have one of those repco club cars thingys.

[niZmO_Man]

Run a thermostat.

[iruvyouskyrine]

Of course I will to begin with, but if it comes to it I'm happy to take it out if it means I can keep skidding.

I was asking for advice about what part to 'gut' to get the best of both, enough restriction to give coolant in the rad time to cool down and to keep the circuit somewhat isolated.

[MrStabby]

[iruvyouskyrine]

We'll that's easy, so all it is really doing is making the ID of the path that it flows through smaller allowing less coolant through.

[MrStabby]

Yeah i'd love to have someone explain why its better than just leaving it out. Intuitively, you wouldn't think it would make any difference.

[KiwiRS4T]

Opening temp of thermostat makes no difference to max temps.

I think the reasoning behind not running no thermostat is that the water flows too quickly through the radiator to allow heat transfer.

[iruvyouskyrine]

Yes I know that kiwi, I think you need to re read my original post. No matter what temp thermostat I put in it, it still idles at 84deg. The current thermostat I have (65deg) should be regulating the idle temp to 65ish degrees but it's still sitting at 84.

And yes I have properly bled the system.

[Ben C34]

Oh, you are talking about at idle? In that case the fan isn't engaged and won't be moving much air at all.