Saturday, Jun 01, 2013 at 23:25
Coogs,
So, you have your EGT pickup pre turbo?
Assuming so, then your numbers are all good re the turbo. If you are reading 500°C POST turbo, that's too much!
Seems like you're fuelling is set about right with 9psi on a turboed 1hz, and the EGT you are getting.
Installing an intercooler would reduce your EGT by possibly 100°C. Whilst the EGT are not a problem at the moment, EGT are also an indication of load on the engine. If you can reduce the load on the engine, and increase it's efficiency, it may very
well help keep the coolant under control. An intercooler would help achieve this. It would also block airflow to the radiator - unless you got a water to air unit. Even then the WTA radiator needs to dissipate a lot of heat and will block air to your radiator.
Is your fan clutch working correctly? Do you hear it roar when the temps rise? Of course the fan coming on adds load to the engine whilst it is trying to give more airflow, increasing pressure on the cooling system.
There is always a pay off with power, and getting rid of the heat. Reducing your load, changing down, slowing down, will be the cheapest option for what otherwise seems like a reasonable setup. You might have simply found the limit to a happy setup.
When I added a 600mm FMIC to my HJ61, it covered the entire radiator. But because it aided engine efficiency, I didn't notice any decrease in cooling system effectiveness. I also have a high performance GTurbo and 3" exhaust, run 19psi and maximum fuel supply from the IP in my 12h-t. It tows
well with 470nm of torque, but has it's limits.
If you had installed a full 1HD-T with it's direct injection, factory turbo, oil squirters to keep the pistons cool etc etc, you may have had a better outcome, or a 1HD FTE, or a V8 etc etc - but that's not what you've got. Maybe your expectations to tow a 3T van at 100kmh with ease are unrealistic. How much you're prepared to spend on an intermittent problem that can be controlled by your right foot is only a question you can answer.
Tim
AnswerID:
512350