IDEA : How about doing away with the low temperature circuit all together. In its place , fashion a stand alone circuit that comprises the utilization of the 3rd radiator and a dedicated circulation pump . That water would be much lower in temperature by not being associated with 200 plus degrees of the primary system. In turn should pull much more heat from inter cooler
Brilliant idea (not joking). At some stage I was thinking similar - just inject one more (even weird) radiator for intercooler circuit when I'll come to this point.
From what I understood from COBB tuning notes for 991.2/718
. Car is definitely cut the power (torque) when the air coming from intercooler is overheated. Based on that if intake air reached the 156F system limits torque (airflow, ignition timing, AFR etc... depending on internal algorithms). So keeping intake cooler will have a sense if you notice this particular problem (e.g. via COBB logger). My Stage 1 even in hot weather is far from that for regular fast driving (not track).
When we talk about limp mode it is a turbo protection routine - just disables the turbo hot flow... and it is built-in from my suggestion for any car. How is it triggered - I don't know but seems like one of the heat sensors near turbo (probably westgate...)
But... it doesn't matter if the tuner can raise the protection temperatures and cool down the intake air with 1) more fuel, richer AFR, 2) water / water+methanol or 3) physical cooling. Knowing myself I would choose an easier way when moment comes: water+methanol instead of changing the cooling system (except some proven bolt-ons). It is less invasive, switchable, and giving more bonuses.