Yes but what defines good smoke? I know when running rich the smoke is alot thicker than when running lean, but even when running lean the smoke is still visable. It would be nice to have a guideline on the smoke other than just experience. I know you can't measure the smoke but maybe a video or 2 of a good race tune would clear things up. I've had 6 different nitro rcs over the course of the last 10 years and still wonder at times how much smoke is enough and how much is too much. I always tune for performance, but like to make sure some smoke is present throughout the power band.