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Author Topic: s4wiki accuracy  (Read 14000 times)
nyet
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« on: January 30, 2017, 04:00:45 PM »

Don't take everything that is in the s4wiki for granted, a lot of it is wrong.

Too bad there is nobody qualified to edit it accordingly, and correct errors. Especially when you (in particular) were asked if the phrasing was accurate or not.

You'd think if "a lot" of it was wrong, somebody would have fixed it, if they were qualified to. Or at least suggested changes.

But the wiki is set in stone, and it can't be edited I guess.
« Last Edit: January 30, 2017, 04:02:21 PM by nyet » Logged

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« Reply #1 on: January 31, 2017, 12:59:23 AM »

The FR is freely available. I see no point in a wiki from an ECU firmware perspective.
Why would you read someone's interpretation of the facts when you can just get the facts directly?

I understand if we were tuning a mystery black box and reverse engineering it, but this thing is fully documented and the documentation is available for free.
I am aware this has not always been the case, but it is now.
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nyet
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« Reply #2 on: January 31, 2017, 01:04:32 AM »

Because

1) it is in German, and not everyone knows German
2) much of it does not apply to tuning, and distilling it down from 1900 pages serves a purpose

So even if isn't complete, it has use - like all summaries do. Outline the basics, and it will inform the search for details (when needed).

It is easy to SAY that isn't true (and no doubt you will make exactly that claim) but that is a matter of opinion.

Not only that, but for anybody who spots an error, it should be trivial for them to fix it, especially if they are tired of correcting people constantly. The incentive here should be glaringly obvious, unless it is your opinion that I should shut the whole thing down.

« Last Edit: January 31, 2017, 01:07:35 AM by nyet » Logged

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« Reply #3 on: January 31, 2017, 02:43:49 AM »

I mean stuff should be there that is not in the FR.
For example the physical process of accessing the ECU (boot mode).
The pinouts.
Maybe info on checksums, flash tools.

But as for ECU internal data, it's not hard to get used to the FR.
If there are questions, as there inevitably will be, the forum is a good place to ask them, because you can gather multiple points of view and not only the one who wrote the paragraph in the wiki.
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KasperH
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« Reply #4 on: January 31, 2017, 04:48:34 AM »

In my case it has helped me a couple of late nights where I was stuck on something.
As nyet says it takes the essence of some often used maps and parameters and explains them in a more comprehensive way if a person is not either good at German or just can't or won't read the FR Smiley
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nyet
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« Reply #5 on: January 31, 2017, 02:25:21 PM »

If there are questions, as there inevitably will be, the forum is a good place to ask them, because you can gather multiple points of view and not only the one who wrote the paragraph in the wiki.

Agreed there, but forums are terrible for centralizing useful information. Even worse, there is no guarantee (to me anyway) that this forum will survive indefinitely, because I do not have access to the DB. I do have access to the s4wiki db, and, more importantly, would gladly distribute the contents to anyone willing to keep backups.

There is literally nothing preventing people from coming to a consensus on wording for a central location, ironically BECAUSE there is an FR to refer to if needed to settle disputes.

In fact, wikis were DESIGNED for this, because mailing lists (and their usenet/forum descendants) are terrible for collaborative work.
« Last Edit: January 31, 2017, 02:26:58 PM by nyet » Logged

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« Reply #6 on: January 31, 2017, 02:37:07 PM »

This topic is BS.

The wiki is well thought out, organized in a cohesive manner, and to my knowledge is mostly accurate.  It is a great asset to the community and I thank nyet every time I open it up for the effort that he's put into it.

Even though I've done most of what's on the wiki countless times, I still reference it when I forget each exact map/cw to change when I am trying to code some thing out, for example.  I can refer to the FR when I need to dive into something more technical, but who the hell wants to do that for something simple when it's been noted and organized on something like the wiki.

As stated, the wiki is in English.
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nyet
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« Reply #7 on: January 31, 2017, 02:53:40 PM »

I appreciate your support, but it is missing the larger point:

I want people who find errors in the s4wiki to fix them, or at LEAST tell me what to fix.
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« Reply #8 on: January 31, 2017, 08:00:01 PM »

I appreciate your support, but it is missing the larger point:

I want people who find errors in the s4wiki to fix them, or at LEAST tell me what to fix.

Has it not been noted that the FR has errors too?  Point is it's never going to be perfect anyway.
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opticaltrigger
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« Reply #9 on: February 01, 2017, 03:06:52 AM »

Personally,from a noob perspective I find the wiki to be invaluable.

It's logical and methodical.Without it and having to rely solely on the FR would be an insurmountable task for most people.I think even those from a technical background with a bias toward engine tuning would find it utter torment to try and understand,without the wiki as an introduction or at least an aid.
The wiki is an invaluable and greatly appreciated document that should be commended.The dedication,comprehensiveness and effort that has been put into it by it's author (nyet) over the years,I doubt could be equaled anywhere in any other introductory document that there is on the subject.

This of course is a noob perspective on it but ultimately I see noobs as it's primary target audience.
Great work and many,many thanks for it.

All the best
O.T.   
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prj
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« Reply #10 on: February 01, 2017, 01:54:42 PM »

I have a different viewpoint because I am not a hobbyist. Simple as that.
And I do not deny that work went into it. But my points are also perfectly valid. As it stands right now it is one mans interpretation of the truth.
It also applies mainly to two platforms, whereas there are many more with ME7 ECU's on different makes and models, where things are very different.

Has it not been noted that the FR has errors too?  Point is it's never going to be perfect anyway.
The FR is the specification for the ECU. It does not have errors - if things do not match up, then it is an error in the ECU, not vice versa.
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nyet
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« Reply #11 on: February 01, 2017, 02:07:56 PM »

Ignoring the larger point, again, which is to correct obvious errors.

30 seconds of time, vs who knows how long arguing in this stupid thread.

Which is in YOUR interest, so you don't have to constantly correct misunderstandings.
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« Reply #12 on: February 01, 2017, 02:17:50 PM »

kek.

Starting on first page...
It says to use KFLF, where KFLF should not be used. Fuel system nonlinearity needs to be corrected with FKKVS.
KFWDKMSN and KFMSNWDK should never be touched unless you changed TB. If you have issues with msdk/mshfm you need to edit WDKUGDN and the VE model in BGSRM.
DSLOFS is just wrong. Should never be changed.
Torque stuff is not explained at all. Just change this map, change that map.
"Cam changeover requested boost" stuff is a bad idea, because you mess up the VE model by just making the maps the same.
Torque monitoring paragraph should be just deleted. I have never ever changed any torque monitoring maps (apart from NA to Boost) and I don't think I will ever need to. If you need to change those your tune is bad.

Also it's a clusterfuck on a single page.
There should be different pages on different topics, not just "tuning". Maybe sorted by module or something.
And a central summary page with links.
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nyet
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« Reply #13 on: February 01, 2017, 03:13:55 PM »

Thank you! Bear with me, and we can discuss them point by point..

It says to use KFLF, where KFLF should not be used. Fuel system nonlinearity needs to be corrected with FKKVS.

I agree, but the stock FKKVS for the 2.7t is completely flat... and the calibrator seems to have decided to do fueling corrections lin KFLF, which is why it is worded the way it is..

I will add a note to that effect, but I think it already says as much.

Quote
KFWDKMSN and KFMSNWDK should never be touched unless you changed TB. If you have issues with msdk/mshfm you need to edit WDKUGDN and the VE model in BGSRM.

I will try to fix this part as well.

Quote
DSLOFS is just wrong. Should never be changed.

I actually disagree here, since there is a bad side effect for people running at the boost sensor limit where req boost can be over the sensor limit. Not good for PIDs in general, especially since there is no way for the ECU to know this is happening, and that the PID is out of control. A slight inaccuracy in actual boost seems to be a fine way to prevent this.

Not sure if we can agree do disagree on this point, especially since the proper "fix" would be the 5120 changes AND a >2.5 bar sensor, which are (by now) well documented.

I will try to add a note to that effect.

As an aside, the only other proper way to "fix" this is ASM code to cap req boost at the maximum possible boost sensor reading.

Quote
Torque stuff is not explained at all. Just change this map, change that map.

I welcome a better explanation, I agree it is a mess

Quote
"Cam changeover requested boost" stuff is a bad idea, because you mess up the VE model by just making the maps the same.

I will add a note that it is not recommended, but in my experience, even though the "accurate" thing is to alter request boost for a given req load when cam position changes, in reality, it disturbs the PID, and there doesn't seem to be a way to calm down the req boost while keeping the VE model accurate.

Quote
Torque monitoring paragraph should be just deleted. I have never ever changed any torque monitoring maps (apart from NA to Boost) and I don't think I will ever need to. If you need to change those your tune is bad.

I agree, I will remove those sections

Quote
Also it's a clusterfuck on a single page.
There should be different pages on different topics, not just "tuning". Maybe sorted by module or something.
And a central summary page with links.

Yea, i would like to do this too, and i started to, but people seemed to want a single page they could print out.

Again, thank you for your input, it is extremely important to me (and hopefully others) to get this sort of information.
« Last Edit: February 01, 2017, 03:43:45 PM by nyet » Logged

ME7.1 tuning guide
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Trim heatmap tool

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
prj
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« Reply #14 on: February 01, 2017, 05:53:31 PM »

If PID goes "out of control" it will cut throttle due to rl exceeding rlsol, simple.

DSLOFS and DSLGRAD is sensor scaling, they should be what the sensor datasheet specifies.
If you want to limit req pressure ratio that is what KFLDHBN is for.

Furthermore, it will never request 2559 mbar because of stuff like KFPRG and other things in the VE model.
That DSLOFS paragraph should be just deleted.

I have no interest in arguing about any of this.

As for torque, all the answers are precisely written down in the FR as to what it does, what it represents and how to calibrate it.
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