uavjeep

iTrader: (1)

ok first of all search function sucks right now and google is no help either.

my problem is that i cant seem to get my cloosed loop boost control to work correctly it will come up to target then just occilates +/- 2-3 psi (set point 15psi) and i have done the nessasry steps to ensure my valve is mechanicly good and that it is set correctly (diy valve set as they say to for iwg set as inverted) my pid values are probably way wrong but this is the best i got them to that slowed down the occilation rate p12 i50 d165. i got tired of it not working and tryed open loop and still things are not right i got it to hold 17psi steady to red line durring the day then went out a few hours later and it hits over boost (@270kpa) same duty cycles that were good earlier. this was day to midnight. so a few degree drop in temp(does temp have that much effect on open loop boost?) what i want is some segestions on where to go from here as im stumped, it just seems like no matter what values i use i just cant get steady boost control, open or closed loop.

car specs
92 with 2001+ drivetrain
vvt 1.8L 84mm 8.6:1, H beams, ARP mains, head,and rod bolts. stock head,51lbs/hr injectors, custom td05h big 16g manifold with ported turbine housing(wastegate),running sequential Lsx truck coils and seq fuel.
MS3X is full standalone running RC1.

Braineack

iTrader: (62)

PID numbers dont seem right.

most of use end up around 28 28 100 or so. i think the main issue is you don't have enough P term.

y8s

iTrader: (8)

datalog please. just post a screenshot of boost rise and level-off like this:






make sure to include MAP and boost duty at least.

uavjeep

iTrader: (1)

ok so its wet outside right now but i will try to go out later. i should do a log with boost control in closed loop correct? and i did try the numbers that brain sugested and it was a little better but still occilates.

thanks Kris.

uavjeep

iTrader: (1)

ok i think i got it as you can see the boost occilates all over the place. and this is with pid at 28 28 100.

thanks kris.

uavjeep

iTrader: (1)

so i have done lots of reading and found no solid answers. have not played with values due to time but still looking for some help smothing.

thanks Kris