So went to radiator shop, he tested radiator, no blockages (tested with infra red heat gun). Bottom to top, inlet to outlet.
he found that the outlet hose was 100 F difference from heater pipe to hose. like 15cm away... so he believed radiant heat.
So i took pipe off, wrapped it (initially with header wrap, then replaced with heat wrap) , wrapped turbo side header, twin scroll manifold and made a heat shroud. That has made a difference so far but only one drive test to work (hour) in 80 F heat.. not a big test yet.
I also swapped to stock thermostat and no swirl pot.
Things to do:
Heat wrap other header side
gold heat tape the charge pipe
use another heat shield to replace the skinny section of shield (see pics)
install the new bumper i brought
install the under body shroud
P.S i hooked up exhaust temp, pitty i didnt have it before. What is it supposed to be? runs from 500 to 650 F i think..
I ended up unwrapping the heater hose and using heat proof wrap so it stops heat not keeps it in.
Made a heat shield to stop the radiant heat
blown out gaskets i need to replace..
wrapped the oil cooler water line
turbo side done but not other side yet
the charge pipe i also wrapped a bit you see with the heat proof wrap, but waiting on my gold heat tape to do entire charge piping.
to stop the floor from getting hot !
heat shield needs to be wider but thats all i had left..
bracket up, no sure how close it needs to be to the pipe to be effective ???
first time on a 80 F highway drive that water was less that oil... mostly it stayed within 10 F more than oil
thats the hottest it got as traffic slowed. Generally water sat around 180-195 F