Tuning nitro is a methodical process. You have to handle it with a certain procedure. Having experience with engine sounds and reading glow plugs will greatly help. Tuning nitro is pretty easy once you get a few simple things filed in the memory banks.

My biggest suggestions are to use premium glow plugs - it’s best to stick with the same brand of plug as the engine or better. Use quality fuel with the proper oil and nitro contents/types. Not all fuels are created equal.