I am looking to try and improve my engine's cooling since at 115F ambient temperatures, its really struggling to cool the engine, ac and transmission.

I've replaced everything in the cooling system. New radiator, condenser, fans, reservoir + cap, thermostat, fan clutch roars and I hear it lock and pump (water pump has 75k on it and that's the oldest item). Did the resistor mod to turn on aux fans at 95C.

Everything cools just fine until I hit 105F ambient. At 115-120F ambient at slow speeds it cannot keep below 100C. It runs about 105-110C at idle/slow speeds. Never into the red zone, but there just isn't enough dissipation of heat.
I already upgraded the single aux fan for a twin high flow SPAL fans.

So at this point I was thinking if I could make the water pump spin faster to give a boost.

I did a google search and only found info for the diesels...Anybody know if it would be possible for a M103?

Thanks!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k