Thanks,

Some clarification questions;

Is the Lambda Control primarily for preventing lean running & preventing engine damage or to try and maintain the requested AFR?

MLHFM is volts to air mass, I haven't changed the MAF sensor or housing so should I need to change this?

KRKTE can be calculated, I'm using 0.05927 for 550cc injectors?

Thanks again

Thanks all,

I think I've got how it works now.

You need to get the STFT & LTFT within 10% of zero, the STFT going from + to - at idle, I have this STFT -3-ish to +6-ish and LTFT 1.5.

Is it worth trying to adjust the FKKVS to mitigate the problem as well as winding in the load at 3 - 4k rpm?

I think the hardware is working fine as I'm using the factory map and it's boosting over the requested, with plenty of pull until the boost & AFR yo-yo.