2 core versus 3 core radiators

[the evil twin]

snip

slight hill / gradual rise -
temp alarm goes off
factory gauge goes just past half way ( to about 92* off a 90* angle)
air con goes off
boost spikes to 12lb
EGT goes to 550*


is it my rad........????
is it my thermostat..........?????
is it my water pump.........?????
is it my Viscus fan...........?????
is it the fan itself.............????
is it a shit heap because the air con goes off when its a 43* day...........YES..............

I welcome your suggestions...........

Hiya Col,

Please excuse the snip and my Boldface.

You are running D Gas and EGT's of 550, if you lift the welly a tad the overheating problem will go away.
It is the engine load driving the coolant temps not a faulty component as such.
If it was cooling system unserviceabilities the EGT would stay much lower and only Coolant temp rise astronomically.

If you want to keep the welly buried then you will need to improve the efficiency of the cooling system and go for a different radiator.

Nothing you have is broken as such, just not efficient enough to handle the heat load