I run a2w on my blown f150 with a custom ice tank and I have it come on with the ign. I have a intake air temp sensor and heat soak/boost heat has nothing to do with ect figures. You should be running the a2w pump any time the engine sees boost and to keep the temps down keep it running. The only issues I see with a2w is when the coolant gets hot it stays hot for some time so at the track an ice box is a must, plus it drops the iat temps below ambient temp.