check this out....
http://e30m3performance.com/myths/mo...ter_wetter.htm

basically, i tried multiple things at once.. so.. didn't really know if it's water wetter or not...
.
i changed everything at the same time...
1) twin oil coolers
2) use chemical to flush my radiator to have a rust proof radiator or engine coolant paths
3) i dump in 1 bottle of water wetter 1/2 bottle of coolant and remaining water. (this is what i saw on the bottle that says mix with 25 % of coolant if it's a road car, assuming 50 % 50 % is for race engines)

Last time......
when i track my car i previously run until my car goes into limp mode that makes me boost at 0.5 BAR only instead of my normal 0.9 BAR.

improvment i obtained
constant 0.9 BAR through out whole session..... water temp never goes up more than 105 degrees celcius.

yeah i didn't have a water temp meter before as well :P