Closed loop function ecotec/L67
Posted: Tue May 31, 2022 4:21 pm
Can someone please explain how the 2 timers works on the closed loop function for the ecotec/L67?
Not long ago my low speed thermofan stopped working on the missus Calais, this allowed the engine to reach much warmer temperatures than it did normally with a cooler 82°C thermostat fitted. On a recent trip down south I noticed that once I'd driven the car, let it get up to temp and then stopped the fuel economy improved, this occurred when the engine temp got much higher than normal (heat soak with the engine off). So much so that when cruising I could actually see the instant fuel usage dropping as we cruised at a constant speed/constant TPS. When I got home I checked the tune and found there are 2 timers in the closed loop function. A cold/enabling temp and timer as well as warm enable/timer. See below I've dropped the warm temp threshold to just below the new thermostat temp which seems to have improved the function of closed loop but I'm trying to understand what these 2 timers actually do/represent.
Not long ago my low speed thermofan stopped working on the missus Calais, this allowed the engine to reach much warmer temperatures than it did normally with a cooler 82°C thermostat fitted. On a recent trip down south I noticed that once I'd driven the car, let it get up to temp and then stopped the fuel economy improved, this occurred when the engine temp got much higher than normal (heat soak with the engine off). So much so that when cruising I could actually see the instant fuel usage dropping as we cruised at a constant speed/constant TPS. When I got home I checked the tune and found there are 2 timers in the closed loop function. A cold/enabling temp and timer as well as warm enable/timer. See below I've dropped the warm temp threshold to just below the new thermostat temp which seems to have improved the function of closed loop but I'm trying to understand what these 2 timers actually do/represent.