[lbrown]

those numbers are percentage changes to the underlying map in the delphi ecm.. it would be impossible to figure what the a/f was from those numbers.. unless you put on the dyno and checked it...closed loop system can work beautifully but that isn`t always true because lots of conditions can affect the o2 sensor readings and from that cause an improper tune.. i am biased because i have acess to a dyno with a/f instrumentation but i prefer open loop systems.. when i get the bike running properly at the correct a/f`s i don`t want feedback from the o2 sensors affecting it.. in a perfect world closed loop is the tits but sometimes the world isn`t perfect...