good settings for afr/ego control - 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 01-15-2013, 02:22 AM   #1
Newb
Thread Starter
 
Join Date: Mar 2012
Posts: 27
Total Cats: -5
Default good settings for afr/ego control

Im curious as to what you all are running for settings in afr/ego, PID or Simple algorithm?
And then:
ign. events per step:
Controller auth %:
and if you suggest PID algorithm
proportional gain:
integral:
derivative:

I finally figured out that my massive afr fluctuation was due to my ego settings...so i turned it off and the wideband is steady, so now i want to see what settings are working the best
nwNAMiata is offline   Reply With Quote
Old 01-18-2013, 07:02 PM   #2
Junior Member
 
Join Date: Nov 2012
Location: Safety Harbor, FL
Posts: 72
Total Cats: 2
Default

Okay, I'll chime in.

I'm using Simple, I think 3 ignition events (whatever the default was), and currently 30%.

I think if you had a big fluctuation going on and turning off EGO fixed it, that's probably an indication that your VE table needs to be tuned so that there's not such a big discrepancy between it and what the EGO is trying to do. OR... it could be that your O2 sensor isn't working correctly or configured correctly.

If you trust the O2 data, maybe try turning EGO back on, set the authority to something like 5%. Put a guage on your MT dash to show the EGO correction. That will at least show you what's going on. Is the EGO correction gauge pegged all the time? Go from there... you can give it more authority... or tune better... or both.

In the end, you want to have as little EGO correction happening as you can get away with. Like, if you rev and hold at 2k (or if you have EGO active at idle like I do...), your VE table should be correct enough that you have no more than a couple percent of correction.

With that, it really doesn't matter much (except for when something breaks) how much authority you give the EGO control. You could give it 50%, and if everything is tuned properly, it's only going to correct the 5-10% that it needs. But, if your O2 fails and tells MS that you're rich when you aren't... you wouldn't want it pulling 50% of your fuel. THAT is the purpose of the "authority" setting.

Once I'm done fiddling with "coarse tuning" where I have the authority set to 30%, I'll probably set it at 10 or 15%. Bear in mind that I'm NA... going 15% leaner than expected in the event of some sort of O2 system problem probably won't blow my engine up. On a high boost engine at high revs... maybe it could?
Loren is offline   Reply With Quote
Old 01-23-2013, 04:19 PM   #3
Newb
Thread Starter
 
Join Date: Mar 2012
Posts: 27
Total Cats: -5
Default

Thanks for the reply, i did turn my ego correction back on after getting my ve settings closer to the correct mark, and then i changed my spark event to 16 and the oscillation has stopped for the most part, usually runnning about 4% correction can someone chime in on what changing P, I and D do? thanks
nwNAMiata is offline   Reply With Quote
Old 01-23-2013, 04:35 PM   #4
Senior Member
iTrader: (6)
 
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default

Quote:
Originally Posted by nwNAMiata View Post
Thanks for the reply, i did turn my ego correction back on after getting my ve settings closer to the correct mark, and then i changed my spark event to 16 and the oscillation has stopped for the most part, usually runnning about 4% correction can someone chime in on what changing P, I and D do? thanks
Learn to google.

PID controller - Wikipedia, the free encyclopedia
albumleaf is offline   Reply With Quote
Old 01-23-2013, 07:17 PM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

3 ignition events is really low for EGO, that's not even a full cycles worth. I use 32.
Braineack is offline   Reply With Quote
Old 01-24-2013, 07:43 AM   #6
Junior Member
 
Join Date: Nov 2012
Location: Safety Harbor, FL
Posts: 72
Total Cats: 2
Default

You're right, 3 is low. I was going from (feeble) memory and guessed what it was. I just checked and it IS at 16 events. Like I said, whatever the default is. I never changed it.
Loren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Headphones PaperMate Insert BS here 32 09-25-2015 09:22 AM
Upgrade my MSM coilovers springs or KW ? elior77 Suspension, Brakes, Drivetrain 14 09-17-2015 10:20 PM
1995 Miata parts, coilover springs, PatCleary Miata parts for sale/trade 9 09-11-2015 08:53 PM
Project DDoS: '99 "Budget" boost build ProjectDDoS Build Threads 1 09-09-2015 02:52 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


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 01:01 AM.