Please post your calibration that this datalog was made with.
I do not see any errors in the datalog posted.
After 4000 rpm, the a / f ratio is very poor
Re: After 4000 rpm, the a / f ratio is very poor
Has the intake been changed?
Re: After 4000 rpm, the a / f ratio is very poor
This has probably changed the way the air flow meter is reading and it will need to be recalibrated for this intake.