2019 fk8 boost fluctuate at high rpm throttle off

[rick_cv3]

Hi everyone, I have a European 2019 FK8 Type R, using Hondata calibration, I installed HKS intercooler, PRL intake system and inlet pipe, RV6 200 cells catted DP, Fujitsubo front pipe and exhaust, DRL radiator, FL5 turbo, I did a WOT test and checked the datalog, and found that the boost fluctuated greatly when the throttle was closed at the end. Is it because of the wastegate problem?

[Hondata]

The wastergate control is going into oscillation. It also looks pretty high in terms of opening for the amount of boost. eg 4mm opening still gives 290 kPa boost; normally on a stock turbo you would be around 1.5mm. You could start to tune the wastegate flow and wastegate position tables but it seems there is more to it than that.

The AFM needs tuning as well. Too right at low flow and too lean at high flow.

[rick_cv3]

If I adjust the air charge limit table and torque table values to a lower value, will these problems disappear? It seems that I may have adjusted them too high.

[Hondata]

Well, no. You've swapped turbochargers without adjusting any of the tables.