ms3x boost control issues - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 08-05-2012, 12:14 AM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2010
Location: On, Canada
Posts: 81
Total Cats: 1
Default ms3x boost control issues

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.
uavjeep is offline   Reply With Quote
Old 08-05-2012, 09:56 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

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.
Braineack is offline   Reply With Quote
Old 08-05-2012, 10:10 AM   #3
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

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






make sure to include MAP and boost duty at least.
Attached Thumbnails
ms3x boost control issues-boost_needswork.png  
y8s is offline   Reply With Quote
Old 08-05-2012, 05:14 PM   #4
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2010
Location: On, Canada
Posts: 81
Total Cats: 1
Default

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 is offline   Reply With Quote
Old 08-05-2012, 08:42 PM   #5
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2010
Location: On, Canada
Posts: 81
Total Cats: 1
Default

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.
Attached Thumbnails
ms3x boost control issues-capture.png  
uavjeep is offline   Reply With Quote
Old 08-08-2012, 10:21 PM   #6
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2010
Location: On, Canada
Posts: 81
Total Cats: 1
Default

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
uavjeep is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:21 PM.