Kinda a dumb of me but im not for sure so i will ask. What is the optimal wideband reading should a car read. I know its something like 14.7 at idle but at WOT and part throttle does it suppose to be around same area?

 

WOT and part thottle depend on your setup. 14.7 is for idle and cruise.

 

14.7 is a "stoich" mixture... which means the exact amount of fuel/air needed for a "perfect" combustion prosses are present.

On most turbo/performance cars people add more fuel than neccisarry. Some as rich as 12.x.

Too much fuel and there is so much left after combustion that you wash down your cylinder walls with fuel (which washes away the oil and allows the cyl. walls to get ruined).

Too Little and it could pre-ignite which generally leads to catastrophic failure in a turboed car.

 

-27 -24 -21 -19 -17 -15 -13 -12 -10 -9 -7 -6 -4 -3 0.5 1.1 1.9
14.7 14.7 14.5 14.3 14.2 14.1 13.9 13.7 13.5 13.2 13 12.9 12.7 12.5 12.5 12.5 12


Something like that. between 11.5-12 in boost.


It takes a super super rich mixture to wash cylinder walls.