Even without having a dyno, it’s possible to do a great occupation of tuning the ignition timing (in the event the spark plug fires), and for that you may need an Audio Knock Detection process to monitor for knock. (Look at this movie to listen to what knock looks like) https://car-performance-shop-near60123.mybuzzblog.com/9332834/5-tips-about-locks-changed-near-me-you-can-use-today