Hi everyone,

I’ve hit a wall tuning my Audi TT (BAM) with a PSR4849 turbo and Bosch 0280158040 (980cc) injectors on a 3-bar FPR. I am experiencing lambda oscillations at low load (idle and low RPM cruise), which also causes slight RPM instability.

I have already calibrated the following:
1. KRKTE (WOT fueling is spot on)
2. TVUB (Idle fueling adjusted)
3. KFFWL (Cold start fueling is okay)
4. FKSTT / FNSSM (Start maps are dialed in)
5. FKKVS (Used FKKVS fixer)
6. KFVAKL / KFBAKL / WFRL (Attempted various wall wetting adjustments)
7. KFLRSG / KFLRSP (Tried decreasing values, but it didn't seem to make any difference)

While WOT, starting, and cold transitions are fine, I cannot get rid of the oscillations. I suspect the issue lies within the wall wetting constants, but being my first time tuning these specific injectors, I haven't been able to stabilize it 100%.

Any advice on what I might be missing or how to further refine the transition at low load?
Thanks for any help.

Hi, thanks for the help. These tables are still bone stock. I haven't touched them yet. The BAM strategy uses ATR fueling, not BTS, but I can certainly give it a try