My previous experience with CL boost control - Back when i first switched to MS, i tried ms1 closed loop boost. I think by some coding witchcraft it was coded to act perfectly for a few days irregardless of what the monkey in control of the settings did. I started it up and turned it on without knowing what a PID was and it magically worked perfectly. Then a few days later, everything changed, all of a sudden i would overboost everytime and couldnt figure out the right settings to get it to stop. So i gave up on CL until today.
That is the entirity of my experience with closed loop boost. For others interested in learning from this thread and want to start on the same page i did all you have to learn is what PID stands for.
My Current setup - I am running a 2.2 board running a 3.0 alpha release of MS2extra (20090912). I have an 02 nissan Sentra Spec V with a QR25DE 2.5l motor with a 60 trim turbo running 9 psi daily. I am currently running a 36-1 wheel for wasted fuel/spark.
My boost control - I am running a AEM solenoid with increasing DC = increasing boost. Wastegate pressure gives me 5 psi.
My current settings:
- Boost control Settings Window
Boost control Enabled - On
Solenoid Fequency - 26Hz
Control Interval(ms) - 10
Boost Control Pin - JS11
Output polarity - inverted
Closed Duty(%) - 0
Open Duty(%) - 100
Algorithm - Closed-loop
Proportional Gain(%) - 50
Integral Gain(%) - 50
Differential Gain(%) - 0
- Overboost Protection window
Overboost protection - Spark Cut
Maximum Boost(kPa) - 200.0
Hysteresis - 10.0
Cut X sparks - 10
From Y events - 10
* Initial settings input
- P=50
I=50
D=0
* could only get boost under control at part throttle.
Ive attached MSQ and 2 datalogs of the run 200
2009-10-07_17.33.21.msl - this contains the only WOT run i did resulted in immediate overboost to find run jump to max map.
2009-10-07_17.42.51.msl - a few part throttle runs which didnt result in overboost.
NOTE: 2009-10-7_17.42.51.msl is too large to upload to the forum so heres a link to it:
http://www.yousendit.com/transfer.php?a ... TVZFQlE9PQ
observations:
It takes around 38% DC to maintain my desired 9 psi goal.
Right now i am targetting 155.0 cross the board in closed loop (less than 9 psi but more space before spark cut).
What should i use for initial values because until i can get this to some better starting point im at a loss as to what to do for the PID values. besides less P and I....