dark_knight
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on stock ecu and injectors currently, i'm guessing i can turn it up a bit to say 0.8bar.. have a FM core, FCD and straight-thru 2.5" exhaust with a relocated air element.. 
absolute minimum engine temp for safe running
- Thread starter dark_knight
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Don't forget that the intake charge is determined by 1. How efficient the turbo is at pumping air, ie being in its most efficiency island and 2. How efficient your intercooler is, it may well be worth buying two cheap air temp sensors and poke them one before and after the cooler to see what kind of temps you are getting.
Yes, some people use TRD at all times. But it doesn't make any sense for daily driver in the UK climate as we rarely get over 20C! In your case, with hot climate and when increasing the boost the engine seem to run hotter then it was originally designed. In this case the TRD Racing thermostat will help as it opens around 10C degree earlier - BUT - this is the most important BUT in this reply - it keeps tight till the temperature gets to 71C! Thus making your engine to warm up quickly and save you on petrol -) In your case with a drilled hole you have a constant flow, which means the engine would take longer to warm up and once warm it if not under boost the temperature might drop well below 70C.
Also think about the TRD thermostat which was designed for the track - WHY it's around 70C mark? Not 50C? or less? Also I know some people drive without one at all on the track. Japan by the way gets pretty hot during the summer! Ever wondered why every JDM car has an AC from the factory?
Another words if you experience oil temperatures around 100C then replacing the thermostat with 10C lower setup would give you around 10C (or less) temperature drop while under boost. So you would get most likely around 90C-92C in my opinion.
The reason why it's not anything below 70deg is because the ecu would never get into closed loop mode and will consantly be running off the start up enrichment map.
In my eyes the stock thermo does the job just fine, Japan does get pretty hot, and with that in mind i'm sure they would have thought long and hard about what temp thermo to use, and then created a map for the ecu for this optimum temperature.
Well of course, BUT for the standard 133Bhp, not the TD04 setup!
It won't really matter what turbo it is, as long as its within its efficiency range it will be a cool charge, unlike the ct9. Like Rev has said the ct9 heats up the air very easily and it has a poor range of useability. The cooler the charge the cooler cylinder temps will be and so will exhaust temps.
dark_knight
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this is true ^^ as i've noticed i'm running a lot cooler too, but that could be down to many other changes i carried out on my setup.. :|
dark_knight
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let's just say i'll keep my temps at about 82 as a bare minimum and i should be fine..