questions about some options on my tuner
 

ok, so about 3 or 4 months go i purchased ac sct flash tuner from a local shop and they put a "custom" 93 octane tune. recently i was looking over the options i could change and noticed it had a global spark adjustment, spark 0-2000, spark 2000-4000, spark 4000-6000, and spark 6000 to 8000 i think.. My question is what are these adjustments. They are all set to 0 flat and have numerous options to change to.. can i change these adjustments to get more performance out of my car?? any suggestions or reccomendations are appreciated.

They let you add more timing in on top of whatever the "base" tune is. Which is whatever the shop already setup. I would not add extra timing in unless you know what the car is already running.