I have the following setup:
- Air temp sensor before A2W IC
- Air temp sensor after A2W IC
- Water temp sensor in filler neck
- e1280s ECU aux outputs to relays for the heat exchanger fan and electric water pump
I could just run the fans and pump constantly (that would obviously be the best for performance), but to reduce wear I'll set up the aux outputs from the ECU to only turn on the relays at some water and/or air temperature. I could also set up the ECU to keep itself powered up for a few minutes after I leave the car, so the fans and pump could keep running and get the A2W system back to ambient temperature before I return to the car.
The air temp sensor after the barrel will be used as the main air temp signal for fuel enrichments in the ECU. The air temp sensor before the barrel will be purely for logging purposes, to see how well the W2A system is performing.