EGO correction below XXXXrpm

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potatomash
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EGO correction below XXXXrpm

Post by potatomash »

Is there potential to add a toggle on EGO correction, so that it is only active BELOW a certain RPM. The only option is for above a minimum rpm, but I would like to set a maximum. I only want to use EGO control at idle rpms.
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
franksidebike
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Re: EGO correction below XXXXrpm

Post by franksidebike »

Hi
In ms2 is no a Setting!
In ms3 is a "Authority" Tabel!
Frank
grom_e30
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Re: EGO correction below XXXXrpm

Post by grom_e30 »

usually ego at idle leaves you chasing your tail and can lead to a lopey idle
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
elaw
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Re: EGO correction below XXXXrpm

Post by elaw »

I guess it's a matter of opinion but I have to strongly disagree with that statement!

I've run Megasquirt on two different engines and have tuned several others and have never had any problem making EGO correction work at idle - you just have to tune it right.

In addition, as far as I know every OEM uses closed-loop EGO control at idle, and has for years. I've never owned or worked on (and I worked as a mechanic for several years) a car with an oxygen sensor where the sensor was not used for mixture correction at idle.

I should add that the above applies to stock or nearly-stock engines. I suppose if you have a very aggressive cam, or very large injectors that do weird things at low pulsewidths (or both), it might not be possible to make EGO correction work well at idle.
Eric Law
1990 Audi 80 quattro with AAN turbo engine: happily running on MS3+MS3X
2012 Audi A4 quattro, desperately in need of tweaking

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kjones6039
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Re: EGO correction below XXXXrpm

Post by kjones6039 »

FWIW........ I run EGO correction above 500 rpm without issue!

Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
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Re: EGO correction below XXXXrpm

Post by turbo conversion »

You could try changing Active Bellow TPS(%) or Active Bellow Map(kPa) or both?

Not sure why you want it set that way but I think this would work.

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

Cheers for all the response

Only reason is I want to use it to correct lean idle on warm starts. Sure I can do it on tps based and map based but ideal for me would be rpm limited. Yes I know you can play with Intake temp correction but I don't really want to do that either as then it changes the whole tune when its actually running at that temp
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
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Re: EGO correction below XXXXrpm

Post by turbo conversion »

What firmware are you using?

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

MS2/Extra 3.3.3
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
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Re: EGO correction below XXXXrpm

Post by turbo conversion »

Okay, thought if you had 3.4.2 you could use ignore mat for hot start.

What rpm range are you wanting to use for ego correction?

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

It does have the option to disable MAT during ASE is that what your referring too? I have that checked but its never really going to fix the issue because ASE can only go for so long.

I was thinking less than 1100rpm. I have a solid idle at 1000rpm
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
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Re: EGO correction below XXXXrpm

Post by turbo conversion »

I would think setting the tps bellow 2 would only allow ego correction at an idle but maybe not.

Just for grins I am going to give it a try once it stops raining and see what happens.

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

Haha ok sweet. My point of this thread I guess, was it just seems odd theres no parameter for max rpm when the code to do it would be very straightforward, I assume. I thought about doing the code, but I'm not familiar with the codebase
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
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Re: EGO correction below XXXXrpm

Post by turbo conversion »

I think MS2 Extra is pretty much at it's end of development due to limitations, efforts are on the MS3 platform.

I too have no idea how to read or wright code, way above my pay grade :lol:

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

Yeah probably. Haha yeah I could do the code I'm just worried about wrecking the ecu when I load it on haha
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
potatomash
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Re: EGO correction below XXXXrpm

Post by potatomash »

Ive got it working reasonably ok just with the settings available. The only issue is when I have a heatsoaked warm start, I have to wait the 25 second delay for the O2 sensor to start working and then megasquirt starts correction. Until that point its lean af. But more or less it works good to fix my heatsoaked idle
'88 BMW E30 M20B25 GT3582r, MS2, Mitsubishi GTO wasted spark coils, 630cc injectors, launch control
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