Modifying Motronic 2.3.2 ECU hardware and software.

[-ice-]

Hi,

I've got a map which is 4x1 with rpm axis in this "enrichment background calculation" procedure. I assume it's the injector constant. Can anybody confirm this? If it's right, why is it rpm dependant? I know that the battery voltage is a factor for fuel flow through the injectors (there is another map for this...)

Regards

[-ice-]

The injector constant could also be a byte in the special block where the rev limiter is...

I think i need an afr gauge now to find it out.

[Kapn.K]

I believe I remember Dmitri saying in one of these threads that there isn't an injector constant. You just adjust the injector duty cycle to compensate. I'm sure he'll chime in when he has time.

[prj]

Uh… there is single value. FGAT0.

[-ice-]

FGAT0 and KHFM, new words for my dictionary

[Acki]

I think it's important that there is no real "injector size" factor maybe you can add some.
So only "real" factor is used for the fuel consumption signal a friend told me.

But as far as I understand it you have several other factors which you could "misuse" for that.
Battery correction, coolant temperature etc.
What do you think?

[grundey]

FGAT0 and KHFM, new words for my dictionary

FGAT0 should be Grundanpassungsfaktor and KHFM Grundanpassungskonstante

[prj]

One more time, there is injector constant single value…
There is also a factor for fuel consumption display.

Do not listen to friends too much, disassemble the code, it's in every Motronic with 8051 based processor. In one place or another.

[Acki]

I'm on the way. Injector Routine nearly all maps "linked".
Next step to check what goes in and what comes out.

I spoke with a friend and he showed me 3 pages of the Funktionrahmen.
Only K1 could maybe "something" what you can "misuse" - I'm not sure.
As you told me, I have to understand every line

Maybe helpful for other. IDAPro disassembles much better readable when I chose the 80535

[prj]

There is nothing to "misuse".

With stock calibration load is injection time to reach lambda 1.
You can modify the base constant, to keep load that way (even with bigger injectors), but then you have to recalibrate almost all maps, and you will eventually lose precision as well, because the 16 bit load that is used internally is not really *256 to the 8 bit load, the scaling is different.

There is also the base constant from which all further fuelling is derived, this is in some ECU's a configurable parameter, in others it is a hardcoded parameter, but you can adjust it in all of them.

It does not matter what the FR says - for example my speed density conversion motronic is nothing like the FR anymore. It is custom code using the stock hardware.

[Acki]

Thanks for the gold dust

[vwnut8392]

could someone please explain the basis of the load scale? im confused as to what it is based off of. me and a friend was talking about it and he seems to think its based off of manifold pressure where on the other hand i think its based off of the MAF sensor flow. i also had a thought that it was based off of several sensors like the MAF, TPS, air intake temp etc. basically im trying to learn the reason for rescaling the load axis on the maps basically. i upgraded my turbo and i was trying to find on the scale where where 0 vacuum was just so i have an idea as to where the cross over from vacuum to boost was. this was a method i used to help me tune digifant 1 and i figured it could help me with getting a basic tune decent tune setup for my car. im not trying to go crazy and learn every last inch of this ECU but i would like to do be able to make some basic adjustments to my daily driver if i upgrade parts.

[prj]

tL = KFUN(MAF)/RPM

[Acki]

@vwnuts: Don't understand me wrong but you are in nearly every Forum related to "hacking the motronic" and I have seen threads or let's call it "requests" for Information related to the motronic from you which are years old.
When guys like prj are not willed to give you information you are pissed.
Sorry but with some hard work you would know and understand much more.
You question shows this...

[doncecone]

Hi guys, do you know on the IGN map, on the load axis, higher number means more or less load? Thanks in advance.