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Rb26 Rising Temp - Advice

aleaspeed

By aleaspeed,
in Engines & Forced Induction

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aleaspeed Apprentice

aleaspeed

Posted
Posted

Just completed a re-build:

JE 87mm pistons

Tomei OGK - 1.2mm

ARP Head studs

Cosworth Bearings - Std

Tomei Poncams - 260/260

Apexi PFC - D Jetro

Koyo 4 core Radiator

N1 oil pump

Mishimoto 62c Thermostat

GT2860-5 Turbos

Mines Titanium DP

3.5" SS Jasma Exhaust

Car runs well and maintains water temp in the 70s and oil temp in the 80s when driving.

Problem is when idling for more than 10mins, water temp rises to 90c+. If the car is parked soon after, about 200ml of coolant flows out of the expansion tank.

Advice?

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paulr33 Grand Master

paulr33

Posted
Posted

you might have a basic water pump issue or some sort of flow issue

90 isnt that bad, but it shouldnt move past 90

ask the engine builder?

the n1 water pump flows less at idle vs stock as its designed for high end RPM high flow

so at idle, it will actually be outperformed by the std water pump in terms of flow

when did this start? since the radiator change?

check the basics etc

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Would an N1 water pump help?

not really.

You've gone a put a part in thats not fit for the application - a 4-core rad.

As you've stated it's perfectly fine when driving, and it will be... Or more importantly track - which is what i'll guess it's designed for. Not street.

I could be wrong, but all bets point to the rad as the issue.

You might have not bled it correctly or something and have air lock/bubbles. But i doubt it.

aleaspeed Apprentice

aleaspeed

Posted
  • Author
Posted

I built the engine myself and it definitely goes past 90, but if I keep the revs up above 2k, it drops slightly.

The problem started after the re-build which is the same time I installed the new rad.

Already bled the system twice. No change.

UWISSH! Grand Master

UWISSH!

Posted
Posted

Is it a 53 mm koyo radiator? If it is I have the same on my r33 gtr

I have never had a problem like this, normal driving temp is at 66 deg n when at idle in traffic it may only move 1 or 2 degrees

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Thermostat only determines when the water starts circulating. Once it is open it has no effect on max temps (only minumum temps in a very cold climate). Stock would be better as 70deg is not hot enough. Have you got a shroud for your fan? Fan doesn't do much without one.

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