Closed Loop Boost Control
#1
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Closed Loop Boost Control
Why doesn't it work? I've never heard of anyone getting it hooked up; we all just disable it and go off duty targets. With the temps dropping here in SLO, though, I am getting an absurd disparity between daytime boost and nighttime boost, like 5-6psi. Before I remove the EBC and replace it with a Hallman MBC, does anyone have any tips for closed loop control?
#2
While back I did some research on this. Mainly reading on msefi.com forums. From what I gather, the code is written incorrectly. So no matter what values of P, I, and D you use, you'll never get it right because the math written in the code is "wrong". But apparently this is a "secret". IE-the people that wrote it don't think it's wrong, or won't admit it anyways. Of all the reading, I found one post where someone got it to work. They said one of the terms was "backwards" from what it should be. But others tried his settings with no luck.
MBC for me. If someone makes closed loop super easy to setup and it work, I'll think about EBC. Till then....
MBC for me. If someone makes closed loop super easy to setup and it work, I'll think about EBC. Till then....
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Why doesn't it work? I've never heard of anyone getting it hooked up; we all just disable it and go off duty targets. With the temps dropping here in SLO, though, I am getting an absurd disparity between daytime boost and nighttime boost, like 5-6psi. Before I remove the EBC and replace it with a Hallman MBC, does anyone have any tips for closed loop control?
Would you care to give me some reasons for doing so?
Thanks
#8
Has anyone tried just the P value, or just the I? Negative values may be required.
BTW from dicking with the PI of the AEM, they omitted an important step, that the I ONLY kick in when boost is within a 2 psi or so of target. They also omitted the D which is really important to prevent overshoot and have fast response.
BTW from dicking with the PI of the AEM, they omitted an important step, that the I ONLY kick in when boost is within a 2 psi or so of target. They also omitted the D which is really important to prevent overshoot and have fast response.
#9
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Not closed loop fuel control, closed loop BOOST control. Closed loop fuel is good, most OEMs use it, or you can just tune your car correctly and leave it off so when your wideband takes a **** you can drive home anyway.
#12
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However when I started playing with the other features--the boost cut with intake temp and boost cut with knock--it would severely overreact and pull way too much duty cyle, then try to add way too much duty cyle, then pull it again, and so on. It was horrible, so I disabled it and went back to target table only.
MS does .msq switching. If you're not using the feature currently, you could always load in the same msq with 2 different EBC duty cyle tables and switch for warm/cold. It's also very useful if you like big smokey burn outs. Tip of the day: Run on the low boost msq, apply heavy throttle to where you'd be fully spooled on the high boost msq, then flip the switch. The extra boost will come in immediately and light the rear up.
#13
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Keith on MSExtra is looking at sorting the code out.
He's working on proper PID for closed loop idle and once that's done he's going to look at the closed loop boost control.
Moot point for me seeing as I use a superior method of attaining Forced induction, but for the rest of you it should be sorted pretty soon-ish.
He's working on proper PID for closed loop idle and once that's done he's going to look at the closed loop boost control.
Moot point for me seeing as I use a superior method of attaining Forced induction, but for the rest of you it should be sorted pretty soon-ish.
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