gorillazfan1023

iTrader: (1)

With PA0 enabled I get "Conflict with boost pins"

Braineack

iTrader: (62)

youre not answering the question.

With PA0 enabled WHERE?!

when you get the conflict it's enabled in TWO places. You are switching it on/off ******* WHERE?DSAFSFDSAJFKDASJVKSD: Jsadkfjda
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jesus ****.


something else has to "conflict with boost pins."

gorillazfan1023

iTrader: (1)

I don't know, you should understand by now that I don't have a firm grasp on the megasquirt. When I go to on/off ports this is what shows.

Capture by Gorillazfan, on Flickr

Turning it off and having EBC on it seems to start up the same as if EBC is off and PA0 enabled.

Reverant

iTrader: (10)

Yeah, you definitely need to disable PA0 from the programmable outputs menu.

gorillazfan1023

iTrader: (1)

Thank you for indulging my ignorance. So after that I just have to figure out how to tune to fix the other issues?

Braineack

iTrader: (62)

yes. that's your programmable outputs page. keep it disabled.

if you notice on the boost control settings page, pa0 should be selected as the output as well.

gorillazfan1023

iTrader: (1)

Here you can see the unusual idle thing going on. I shut the car off at a light and restarted it and it stopped.

idle oscillation by Gorillazfan, on Flickr

Here are my current boost control settings

boost control settings by Gorillazfan, on Flickr

My biggest issue, I guess, is the unstable idle. For example yesterday I had been driving for about 15 minutes and was stopped at a light. When I went to pull away the car stalled and I had to power cycle the ecu for it to start again.

Braineack

iTrader: (62)

looks like you need to tune. this would involve tuning things like your fuel table and idle control settings.

gorillazfan1023

iTrader: (1)

I have been tuning for the past couple days. What I dont understand is why, even though my idle settings have always been crap, it would suddenly change with the addition of ebc. For instance with cl ebc on it does the idle oscillation as seen but will not stop, then when I shut the car down it doesn't want to restart.

gorillazfan1023

iTrader: (1)

Found an old, un-corrupted tune with my idle control settings. Somehow they got way messed up. Changed my current settings to the old settings and turned on Closed loop ebc seems to be working just fine. Does seem to idle droop more then it used to. However I can deal with that for working boost control.

gorillazfan1023

iTrader: (1)

Ok slightly confused. Tuning PID with polarity set on normal. P=100 should yield wastegate pressure? well I hit my target with lots of oscillation.

I then changed P=120 and it hit the target without oscillation and basically held it. Which confuses me because I thought P had to decrease.

So I changed control interval to 51ms went back to P=100 and it hit and held target with minimal oscillation. I read that you want to overshoot target by about 10kpa or so before adding any I. At P=70 I overshoot by about 10kpa. But again it doesn't really oscillate and it seems to hold it. Granted I haven't done any pulls to redline yet.

Is the reason I only have to lower P slightly because I'm only going about 3psi more then wastegate pressure? Or am I missing something in the set up instructions. I found somewhere in my searchings that P typically ends up around 25-30 range.

Braineack

iTrader: (62)

what firmware?

gorillazfan1023

iTrader: (1)

The most recent 3.3.2. I know they changed the boost duty from previously being 100% as wastegate to 0% but I wasn't sure if the PID settings changed for closed loop.

gorillazfan1023

iTrader: (1)

Still not really sure whats going on. I've switched back to open loop for the time being but I'd like to get the closed loop done correctly. If I put P=0 I overshoot the target but also if I put P=100 I essentially hit the target with minimal overshoot and some oscillation. I has the dumbs.

Lloyd_D

I've also had the idle oscillation issue under the same circumstances. It's not related to boost control in my case. It's like the MS2e loses sync or something. In my case it ran the injectors and ignition but couldn't control the alternator so went high alternator output voltage and then went into some weird idle rpm oscillation. I had the battery light (1999 miata) on constantly in these circumstances. Then sometimes blipping the throttle would kill the light and sort the MS2e sync out.

I think Reverant is aware of a possible mod that may help. But I'm not 100% sure.

In my case once the MS2e is happy then when restarting key on ignition to position 2 for 10 seconds before cranking. This seems to reduce the chance of it starting into the oscillation thing.

Lloyd

gorillazfan1023

iTrader: (1)

Ok so I'm making progress but still not sure whats happening. So I got annoyed went and changed some settings including setting P=20. This resulted in 14.5psi. So I worked my way back. P=50 nets my target of 10psi and basically holds it to redline with no oscillation. P=40 hits ~11.5-12psi and holds it to redline as well. So I started adding I and it didn't seem to make a difference. So right now I have P=50 and everything seems ok. So other then that I'm not really sure where to go from here? Add a lot of I? it doesn't really overshoot and oscillate though. It already feels better to drive then open loop though.

Also whats the deal with MS and skipping like 2 seconds in my datalog? You can see in the screen shot how it jumps from like 3800rpm to 5000rpm.


boost control settings2 by Gorillazfan, on Flickr

cl ebc p50 by Gorillazfan, on Flickr

Braineack

iTrader: (62)

you must be barely adding boost over wastegate...

how well does it track with throttle changes? I think you'll find you'll need some I to maintain targets in less than ideal situations.

i was about to suggest it's because you're using the intial tables, but you're not.


when tuning P your primary focus should be spoolup, this should be done in 1st and 2nd gear. If you're doing it in a high gear, you might not hit the target in a low one. Once you tune it so when you mash it in 2nd gear and you're just overboosting over your target, pull to redline and see if you need any I or D to help long term tracking or damping.

gorillazfan1023

iTrader: (1)

wastegate is 6.5psi target is 10psi so not a huge jump. Ok but I'm on the right track now? I'll have to do more datalogs all I've done so far are 3rd gear from 3500rpm

gorillazfan1023

iTrader: (1)

I don't know how I missed this part. Yes I didn't use initial tables because I was confused and thought it would make it simpler off the bat. And yes today I did a pull in second with P=50 and I=20, I overshoot to 12.4psi then it dropped back to 10psi as rpms increased. So I will continue to work on this. Thank you Brain for holding my hand.

gorillazfan1023

iTrader: (1)

It's getting there I suppose. So I did what Brain said to do, got P=40. Then I started adding I and doing pulls in 3rd gear. so adding I little by little just wound up giving me an initial overshoot and then tapering down. So I just went to I=100 and the results were initial overshoot then quick taper down. As seen in the image below.

cl ebc p40 i100 by Gorillazfan, on Flickr

So I figure now it's time to add D to dampen the overshoot correct? So I set D=50 and I get basically the exact same thing as before. See picture below to compare.

cl ebc p40 i100 d50 by Gorillazfan, on Flickr

I then set D=75 but the datalog is garbage and I don't believe it because it pulled immensely hard but the log only shows 10.9psi.

So am I being foolish? Should I only add a little bit of I and then add D? With I=10 I overshoot then slowly tapered back down to 10psi by redline. So I assumed (perhaps foolishly) that I needed to add more I.