Acceleration Ignition correction

[ruzki]

Ok, one last post !

The only good explanation I've seen for this feature - when not being used as a correction for an ECU with a second rate wheel decoder - is to reduce driveline shock loads by making throttle response softer.

I have also seen a lot of baloney reasons people have asked for this.

@ Matt Cramer: Thank you for your great post ! This is exactly the reason i would use this feature for !

You asked a question without giving the reasons why you though such a feature was needed?

Do i need a reason to ask this question ?? NO !
I wanted to know why the developers think that this feature is not needed, when other ECU Manufacturers and also lots of people here in this forum think they need it“ See i noticed that a lot of people in my "area" changed from Megasquirt to the above mentioned ECU and i asked myself why !?

If you have a particular problem MS related, plenty of experts here will help with it. Including those who actually write the software, who I, for one, am incredibly grateful to.

Look at my join Date, i´m almost running the MS-2 for 8 years and have done aprox 100k Kilometers on it. I would never ever call myself an "Expert" but after 8 years of tuning the MS i pretty sure that i know what i´m doing

@kjones6039 and DaveEFI This is sadly not true nowadays there are manufacturers who will give you a better service and direct contact via Team Viewer, e-Mail or Forum with an ECU half of MS3-Pro price. I made this experience myself !

After so many Years and all the effort i put in the Megasquirt it is sad to see that the Megasquirt is getting passed by other´s so quickly..
But all this is OT and does not give me an answer to the question in the first post.

I know that James is quite OK with german language @ James maybe you should consider "Betriebsblindheit"

[kjones6039]

IMHO, I think the OP is just looking for a beef and grabbed onto a topic just to make that beef!

This thread is going absolutely nowhere, don't you think?

Let's move on to something more constructive.

Ken

[jsmcortina]

IMHO, I think the OP is just looking for a beef and grabbed onto a topic just to make that beef!

Agreed.

James

[dontz125]

*WOW* This turned into a massive muck-throwing explosion in short order. I'm not a mod here, but I'm going to stick my oar in anyway.

If I may be so bold, pretty much everyone except Matt and Ken (muythaibxr) seriously over-reacted. The OP started by mentioning this interesting feature he recently came across, then asked a QUESTION, "why don't the devs want to include this." While some of his first post may have been poorly phrased, the language may be a factor here. Useful comments and replies were made explaining what the option under discussion can be and is used for, along with notions that it does in fact have a legitimate use on some ECUs, finishing with reasons why it isn't so necessary on the MS. Question, answer, explanation - a civil discussion.

Since others were able to achieve this, the comments of "troll", "silly", and "beef" by people who should know better were out of line.

I'm going back to my coffee, and my own list of unreasonable bike-related suggestions.

[Peter Florance]

I thought my first question was reasonable.

[DaveEFI]

Ok, one last post !

[snip]

If you have a particular problem MS related, plenty of experts here will help with it. Including those who actually write the software, who I, for one, am incredibly grateful to.

Look at my join Date, i´m almost running the MS-2 for 8 years and have done aprox 100k Kilometers on it. I would never ever call myself an "Expert" but after 8 years of tuning the MS i pretty sure that i know what i´m doing

@kjones6039 and DaveEFI This is sadly not true nowadays there are manufacturers who will give you a better service and direct contact via Team Viewer, e-Mail or Forum with an ECU half of MS3-Pro price. I made this experience myself !

After so many Years and all the effort i put in the Megasquirt it is sad to see that the Megasquirt is getting passed by other´s so quickly..
But all this is OT and does not give me an answer to the question in the first post.
"

If there are better ECUs around at half the cost of MS where the support is excellent, go for it.

[Peter Florance]

Also look at the number is posts. Doesn't look like a lot of effort to me

[elaw]

For what it's worth...

I can see another scenario where this feature would be useful although as in other scenarios, it would be a bit of a band-aid.

If an engine is running very close to the knock limit, and tends to momentarily go lean on tip-in, that lean condition could cause knock. And a short period of timing retard on tip-in could correct that.

Now of course the "right answer" in the situation above would be to fix the momentary lean condition via AE, but that's not always 100% doable.

[sd1nl]

Quick and dirty way to implement "tip in retard" into the system could be to add tpsdot as a secondary ingnition load.

You could blend this in then as a secondary additive table.

[Paul_VR6]

Every time I have thought I needed this, it was ae related. Sometimes widebands are slow.

[Peter Florance]

Every time I have thought I needed this, it was ae related. Sometimes widebands are slow.

Recall a video about X-tau recommended using narrow band for tuning it.

[dontz125]

Every time I have thought I needed this, it was ae related. Sometimes widebands are slow.

What then are you suggesting - more TPS-AE at that point?

Recall a video about X-tau recommended using narrow band for tuning it.

Are narrow bands significantly faster? How would you tune this in? Am I correct to presume that when this is a problem, the lean spike at tip-in is sufficient to cross the 14.7 border, and it needs to be tuned back to the other side?

[Peter Florance]

Narrow bands are faster. In batch I run as many squirts as possible.
In sequential setups, I set end of squirt before intake valve opening. That seems to help a lot. Of course 100% lag factor on MAP.
I think this was the video:

https://youtu.be/0ItkpVofKLw

[Paul_VR6]

What then are you suggesting - more TPS-AE at that point?

Yes

[dontz125]

Thanks, guys.