Tuning the ECM (Engine Control Module) of a Scion TC, particularly for a Stage 1 tune, typically involves adjusting various parameters to optimize performance without extensive modifications. Here’s an overview of what a Stage 1 ECM tune generally includes: 1.Air-Fuel Ratio (AFR): Adjusting the AFR for better combustion efficiency, which can lead to improved horsepower and torque. 2.Ignition Timing: Optimizing ignition timing to enhance performance and throttle response. 3.Throttle Response: Mod