Hey Jeff,

It seems that everybody is quiet busy to help you out, but no worries, I think your question is good and answers would be helpful for others as well
I will start and hopefully others will help..

At first, every Goengines user MUST read this

If we simply look, then most important things is make sure there is no air leaks+always warm up engine+always tune warmed engine+always tune for nice clear smoke, no smoke no good, too much smoke the engine will not show good performance+take some time and read this thread back there is some real diamonds, take out them and save them

Ok then we put rule that these symptoms are in race tune, not just bushing few tanks, the engine is warmed up.
lean on bottom and what will the car do???
I think firstly you will hear very fast machine gunning, the bottom end will be like crazy, there might be no smoke at beginning.

rich on bottom " "
I think it will be a lot of smoke and will be hard take off-too rich bogging, because of too much unburned fuel, it will be so bloooberry sound....

lean on top " "
Firstly, it will be almost no smoke or even no smoke, in straight the car will try to rev up to the moons, or will sag power at end of straight, or right after straight in first corner it will bog down, like will hesitate to spool up.

rich on top " "
It will not perform after middle of straights, you will will hear clearly that at begining of straight is sort of ok, but then it not rise rpm anymore, it is like driving with 60% of power, probably with a lot of smoke, and sound will not be crisp, but bloooberry...

Hey Go gurus, please help with your comments, as I see, sometimes you need this kind of info fast, and it is impossible to read in one hour these lovely few hundred pages
I really think that this kind of "manual" will help to many many Go engines users, where they are not so shure for tuning and don't see what performance can really show this engine