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Overheating 180sx

Equinox

By Equinox,
in Engines & Forced Induction

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Equinox Rising Star

Equinox

Posted
Posted (edited)

I've got a problem with my friend's 180SX.

After it is warm it only takes 3-4 full throttle runs to redline to get his water temp up to the 90s, and it takes ages to come back down. He used to drift it at Winton with no issues until one day when it just overheated on the track and has been doing it ever since.

Since that day, to try and fix it we have:

- Rebuilt head. Cleaned up the whole thing, port and polished the ports and installed new head gasket.

- Removed thermostat.

- Installed Alloy Radiator

- Installed Twin Thermos

- Bypassed heater core

- Changed Water Pump

- Flushed the whole system

And it still does it! Can anyone think of anything we've missed? One of our friends suggested that the water pump could be sucking the radiator hose closed at high rpm, but I've never heard of that happening before?

Car is running a T518Z, is an SR and is making around 240rwkw if it makes any difference.

Thanks,

Peter

Edited by Equinox
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tacker Mentor

tacker

Posted
Posted

not to sure about your engine, but on the Rb26 if you remove the thermostat entirely then the water will bypass the block and just go straight out the outlet pipe as its only 100 mm apart. As most things it will take the path of least resistance and the rb26 has a 25 mm hole in the back of the themostat house which is connected the outlet pipe on the head.

cpt_impossible Apprentice

cpt_impossible

Posted
Posted (edited)

Here is a writeup I did for NICO Club (US), maybe something in it will help.

OMG my RB is overheating

Oh, and the water pump sucking the line closed, that was my problem I believe. When I replaced the lower hose, which was soft with an OEM unit from tweakit, the overheating problem I had at constant higher RPM (Freeway) went away.

Edited by cpt_impossible
D_Stirls Veteran

D_Stirls

Posted
Posted

I'm pretty sure that an oil cooler will go a long way to fixing your heating problems. The thrust turbo's heat the oil up quite a bit as they are oil cooled and they run hotter than the equivalent water cooled BB turbos.

Do you have a SR with the factory heat exchanger on top of the oil filter or not? (some did some didn't) Even if it does they don't work very well.

I was having the same heating problems with my CA18 as i was getting oil temps around the 105 mark and water temps around 95 in general driving. As soon as i fitted an oil cooler i didn't get engine temps above the factory 82 degree's and the oil temps haven't been above 90 degrees

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