here is a datalog we just recieved of a customers car, this is NOT where we want to be air fuel wise!!!!!!!

so this is the before datalog identifying the issue, now time for the fuel tweaks to this car. most cars arent going lean until over 5k rpms but this one has such a lean tune that it is lean from the time the pedal hits the floor until they let off.

its tough to stress enough how important a wideband gauge is when tuning these cars. dont be an ostrich and bury your head in the sand thinking that since your motor hasn't grenaded yet that your fueling is adequet running over 18psi. widebands used to be $3000 10 years ago, they are now less than a 1/10th the cost so there shouldnt be any excuses, protect yourself with knowledge!