Advancing the ignition just means that the spark plug will fire slightly sooner. This is usually better for power, but is a little harder on the engine. Advancing the timing increases the heat and pressure in the cylinder, so if taken too far will cause detonation.

 

brandon1978
You explained that very well and simple.

 

Called the local(read: the *only*) Infiniti dealer yesterday; they do not offer such a service. Booooo Crown Infiniti.