Hello,
From converted car to SD I always suffered about lean afr during tip-in.
Now after switching to ASNU 1050cc and FIC resistor box this behavior is much worse.. Too lean in tip-in.

Max IPW accel enrich : 4.61ms
Moltiplicator : from 0.38 to 0.70
TPS delta : + 30 units to all table.

Any suggestions ?

 

Make sure your injectors are scaled in properly and adjust your rpm vs. VE table.

 

Scaling :975
Latency 14v : 1.224ms (like asnu datasheet says)

 

What do your trims look like?

 

Mid and low around -4

 

This thread will help. Lean tip-in was a common problem so you'll find lots of discussion about it.
https://www.evolutionm.net/forums/ec...ched-roms.html
If your rom has the 3D RPM vs. VE table you'll have more adjustability, but the 2D table in the earlier rom works just fine.