Hondata

Hi,
I have a customer car with rampage turbo 450 , 3.5" Maf Housing , Prl exhaust and Frontpipe, Prl Airbox and Flex Fuel.
In the WOT i have some AF swing , i attack the datalog..
The car and the power feel smooth, only this bad AF curve

What can cause this?

It looks like this needs some tuning of the AFM to get the proper af readings.

It's not the AFM tuning (but you do need to make the long term trim negative) but turbulent flow past the sensor.