Overboost Post Shift

keninger

Specialist
Sep 11, 2018
66
11
0
Ride
335i E92 N54
Hi

I am getting a bit of overboost post shift with my tune, when I go WOT initially I don't run into this issue but post shift I get overboost, even though I have increased D factor multiplier in higher rpm ares where I would arrive post shift.

What is the most optimal solution for this issue? Aggressive P factor above target to quicly recover or reshape the D factor so it would try to stop overshoot from "futher" away, increase higher boost error areas under target.

Here is my log:
 

carabuser

Lieutenant
Oct 2, 2019
870
1
766
0
UK
Ride
Z4 35i & 335i
Load Target table. Raise that and you'll up the target boost.

If you just want to get rid of the overshoot then take some wastegate off your adder (airflow) up top because that seems to be where you're overshooting.
 

keninger

Specialist
Sep 11, 2018
66
11
0
Ride
335i E92 N54
Load Target table. Raise that and you'll up the target boost.

If you just want to get rid of the overshoot then take some wastegate off your adder (airflow) up top because that seems to be where you're overshooting.

I am running low load target on a purpose, I am tuning the car with low boost, mid boost and high boost and then interpolating the remaining wgdc base values.

I have also lowered wgdc in that airflow area, but PID was still adding to it a decent amount in 3rd gear so values weren't overly high.

I got rid of the overshoot on initial wot spool by increasing D factor multiplier, but here I am thinking I should reshape the D factor table to try and slow down spool from a bit further away, with larger boost error.