So you wouldn't want to have the added protection/peace of mind that comes with living in a hot environment?
Sure I can understand if your radiator is already a substantial size but to carry more heat when you can do something to reduce it?
Do whatever works for you; I understand you have a very hot environment, As it states on the packed its pre-diluted with water. If you want to add even more water then thats your choice.
The factory in japan puts straight colant into the cars and doesnt add water, although that is for stock cars, the cooling system is adequately efficient.
On the old
undiluted stuff they would reccomend a 50%-60% coolant concentration. I quote "coolant concentrations less than 50% may not provide sufficient protection against corrosion or freezing"
So I'd ask you are you really giving yourself protection ?
I know you mean protection in 'cooling efficiency but The factory already have a pre-diluted mix for you.
I use straight honda coolant type-1, fluidyne rad, stock thermostat, stock fan switch, stock rad pipes, stock water pump, stock bonnet. We had a little heat wave over here recently with temperatures seeing 28*C
! peak for a couple of day which is very unusual for over here, I had been boosting on some big roads here alot then I came to lots of traffic on the motorway crawling, and the heat was blistering... But my car didnt overheat, the coolant temperature looked normal, hadnt moved, my fan was on though and my fan isnt even big enough for that rad! just a fluidyne pusher fan.
I can hammer mine all day and it never twitches on the temperature. its really stable... ive even got my turbo plumbed in on that cooling system and its great because its suitably sized.
That heat wave was mega for England