I should probably clarify my position on wikis... I'm not anti wikis so long as all the potential users and collaborators are agreed on what should be in it and the mission statement is clear.

While nyet conceived the S4 wiki from the start as a body of knowledge that others could add to, change and correct, I didn't write my guide as a "how to" as such and I didn't conceive it as a document that other tuners could hack about and contribute to.

I have a track record of producing technical documents which are (intended to be) factually correct, 'absolute' and are peer-reviewed to verify the facts, reduce or ideally eliminate errors so I just stuck with a format that I was comfortable with, but for sure, it didn't really address the spirit and intent of the original post of a genuine 'how to'.

Therefore, there is still 'a gap in the market' whereby Nefmoto users would identify specific goals of interest tuners of VAG Motronic ME7.x ECUs and then write up the salient points (or, better still) produce flow diagrams with annotations to summarise such.

I'll happily contribute to such a thing if I can, just as I have felt able to do with the FR translations. I would just like to see some agreement and identification of specific matters up front then people getting on and producing quality outputs. There's too much tat, rumour and sigh out there on the internet at large but I do like to think that Nefmoto has risen above all that.

... there's a good illustration of how to say nothing much in many words!

TTQS

Anyone *can* edit the wiki. Just re-register. Or have I missed the point?

from Doug's pdf:


question:

at a given lambda, does flame speed change if I change the charge (boost)?

simple question, but I think the answer is not.

any physical evidence?

Thanks, that sums it up.

But looking at any SI engine's ECU structure should have given it away.
Axes on the main ignition maps (not talking about correction maps) are always RPM and some representation of load. (throttle angle, MAP, direct airmass, abstract load, whatever...)
You can always somehow relate these measurements back to charge/cyl. filling.
Why would such systems use load as a main lookup factor when it wouldn't affect flame speed? :-)

O.k., no problem. Good spot for pointing out the correction and thanks for the appreciation. You obviously know your TT specs. I hope you don't fall into the trap that I've seen other Mk1 TT enthusiasts succumb to which is to just bolt on hardware upgrades without understanding the overall effect on the ECU calculations.

I see the agent that did my Revo remap has switched back to APR after less than 18 months with Revo.  

TTQS

very true, but it underlines what I mean: there is no simple "factor" to calculate the flame speed depending on boost. you need to determine it on experience or dyno.


yes, I would like to have that proved   "IMO" and "should" is no physical law. and indeed it seems to neutralize each other. many tunes (not only me7) work fine by increasing boost and changing lambda significantly, but not touching ignition.