I don't have a OAT sensor on my plane but the ground temp was 9C. I took it up to 13000, where it should have been ~ -17C. Oddly enough I seem to have a constant 20C delta T on the coolant but the oil delta T will vary between 5 and 20 degrees depending on power load. The temperature controller works very well to keep the temp at 85C except during a full power climb where it will gradually close on 100C even pumping full speed. I also don't have fuel flow right now, but I hope to both and much more as soon as the EM2 is available.

    I have a switch which allows me to bypass the controller and apply buss power directly to the pump. While doing circuits I was closely watching the cooling temp/press/flow. During descent all three would decrease and the pump would flow minimum coolant as it tried to maintain temp, however what concerned me was that I'd touch down then apply full power for a climb out, I'd see a sudden spike in the pressure, followed a few seconds later by a temp increase and an immediate increase in flow rate. This indicates (to me) possible localized boiling in the block for a few seconds until the flow increases again, reducing the pressure. For this reason I've taken to switching the pump to bypass the controller while practicing touch & goes.