Which is why I am always that little bit concerned about a dyno reprogrammed ECU tuning?
For what exact circumstances has it been 'adjusted' and does this make it operate within extreme ranges properly. I am sure some professional tuners who really know there stuff do but I wonder how many 'unsafe' levels of tune are 'out there'?
Sure there are water temperature correction maps, cold start correction maps, oil temp corrections, etc. BUT I seriously doubt the mapping has been done for 'safety' against all worst case scenario's and more importantly TESTED in those circumstances. I guess this is why engine ECU s/w has a safety margin. I remember Toyota added several layer of protection in their ECU programs for the 3S-GTE and even designed their engine to be 'non interference' so the pistons couldnt bend the rods if the cambelt snapped (space for crowns in top of pistons). Clever stuff.
I'm sure some of it is fuel economy and noise regulated but how much is 'safety' in the aftermarket tuning is really there for all the extreme weather conditions and engine longevity?? Kind of makes you think! Not surprising the manufacturers spend millions on testing their ecu programs every year...
Back to the Skyline, Very best things you can do is fit oil coolers, both for the gearbox oil and engine oil, oh and also uprate the radiator, radiator cap and if your going all out the intercooler too (to avoid detonation, THE no.1 engine killer) and after all that use high quality premium gas. (also avoids det).
Trev