[RICE RACING]

I watched it again and its not to do with boost as it is smooth enough, air to fuel ratio is at that 10.2 region where the graph is softest (step)... I'd say without seeing the 0.8bar runs that it is also running too much excess fuel at that point as well (around 5k rpm) then as the mixture gets to that magic 10.8+ region it steps up in power.

I'd be interested to see with a flat AFR ratio if that did not cure your stepped power band.

I know in my own test car that even with a welders ignition that there is massive differences of power once you get over this "soft power" zone *excessive fuel richness*........ though in some applications you need that to ward off detonation.

At your level of power with also with water meth it needs not be at 10.3:1 region, so I would get them to address that and see if that fixes the problem of low power at that rich zone in the mapping.

Peter