ORIGINAL: moe7404
one of the many things to tune by is your ears. if you are careful you can hear if a engine is rich or lean.
100% tuning by sound is the absolute best way to tune...The engine will never lie to you..if it sounds right it is right....the only problem is is takes time for a person to develop the ears to listen to a nitro...tuning by sound is useless if you don't know what your listening for.....