Originally Posted by Richard E

Tuning an engine is to be done by observing its performance, i.e. see the smoke from the exhaust while accelerating and on top rpm, listen to the sound of the engine, and see the power perfomance. You might use the temperature gun or telemetry for feedback on rpm & temperature. More information is always better. See the oveall picture and get experience with your observations, rpm and temperature measurements, to get the best out of it. Tuning an engine is an art.