Acceptable Coolant Temperatures - help required

Submitted: Sunday, Jan 17, 2010 at 16:58
ThreadID: 75278 Views:24943 Replies:11 FollowUps:12
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Hi all.
I am looking for a bit of advise regarding acceptable coolant temperatures.

Situation:
I am running a 98 Hilux 3 litre 5L diesel with an aftermarket axt water cooled turbo charger. I have a digital temperature sensor that has a coolant temperature sensor in the top radiator hose.

Problem:
On a hot day (30+ degrees) , and travelling at high speed (100 - 110 km/h) with the air conditioninng on my coolant in the top radiator hose sits between 95 and 100 degrees celcius. With the air con off 93 - 95 degrees celcius. This only occurs during high speed driving. Normal city driving or idling the car sits on 88 - 89 degrees celcius (the rating of the thermostat). If my car is overheating and I pull over on the highway the car will cool to this temperature very quickly. Driving at 110km/h the turbo boost sits on approx 5.5 psi.

What I have tried to bring down my coolant temps:
The viscous fan appears to be working fine.
I got it Dyno tuned and the boost turned down to 9 and the fueling tuned last week.
I have tried a new 88 degree thermostat just to be safe
I have added redline water wetter.
The previous owner put in a new radiator which looks to be in very good condition - it is now about 18 months and 10 000 kms old.
I have a thermo fan the helps cool the car at idle speed.
I have taken the spot lights off the car to increase airflow

How you can help me:
1) What is an acceptable temperature for coolant running through my top radiator hose? (am I being too picky - can i run hotter temps)
2) What can I do to achieve a satisfactory coolant temperature.

Thanks for any help you can give me.
Dan
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