Like falkore said, a turbo set up is richer for the reasons listed. The timing (spark) maps are also retarded, or slowed down, a few degrees to account for the higher compression of the air/fuel mixture in the cylinder. You would also do the same fora N/A setup with high compression pistons. The key to retarding the timing is that the mixture is ignited much earlier than the stock 15* BTDC to avoid the possibility of detonation in the engine, where the mixture spontaneous combusts from the high compression.

 

wow this is alot of info and kinda hard to comprehand...
for reals...i need to get to the reading guys...thanks.
laymans terms someone...hahaha

 

just read it calmly and whatever you don't understand... wikipedia... ifstill don't get it,then us again, if still.... then buy yourself a bicycle... j/k! just keep reading and you'll get it...