Megasquirt Support Forum (MSEXTRA)

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.

Hi
In ms2 is no a Setting!
In ms3 is a "Authority" Tabel!
Frank

usually ego at idle leaves you chasing your tail and can lead to a lopey idle

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.

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

Ken

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

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

What firmware are you using?

David

MS2/Extra 3.3.3

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

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

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

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

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

David

Yeah probably. Haha yeah I could do the code I'm just worried about wrecking the ecu when I load it on haha

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