this is the hard thing on cossies, as the base co doesnt really mean too much.....its on boost that matters as thats where it will melt!

as a guide i would aim for around 2.5% c.o at idle.....but you MUST check it has an afr around 11 on full boost

the only way you can adjust the fuelling at the top if shes weak, is by adjusting the ecu global mod.....which in turn will effect your base co, so you can see why the base co isnt overly important, as long as it idles nicely.


ofcourse if you have a good chip, it will idle pefrectly at 2,5% (non closed loop) and have a perfect afr all over the boost curve....