Ok, I understand.
But you always have to keep an eye on math here..
MBT is just a factor of proportionality between injection advance and injection duration..
"just a factor" mathematically speaking.
but a math factor can mean a lot of things...
so..
in tuning terms, how do you think this factor can help you remapping?
I guess you think it can help eliminate the retardation of SOI due to NOx.. but it's just a guess

If you look at the OEM SOI maps they are up and down all over the place..as is the duration and EOI in crank degrees.
Normally for reasons other than peak performance.
So at the end of the day ....yes... the idea is to do away with all the bumps and trough and get left with a smooth basemap.
It would be great to think it would be optimum SOI for economy and performance.....but close would be good enough.

Comes back to the question though.....how close is good enough ?
Is +- 1 degree acceptable if the target is to use Best torque as TDC + 8 degrees ?
Does OEM even bother fine tuning High IQ they dont really use (Max IQ 66mg but tables upto 75mg)?
How far off are low IQ SOI to appease Noise and NOX.
Does 35mg fuel in the duration table actually use a measured quantity of 35mg ?

We cant answer those question without extensive engine dyno analysis.
All we have is maps that have been compromised for one reason or other.
I would like to think there is a relationship hidden in that OEM chaos....hence the idea behind the MBT ratio.
I think there is a relationship there.....but i/we need to look at many maps to see if it holds any truth.

Just another theory at th eend of the day.

it's a nice research but there is one problem..
engine doesn't run with only soi map, there are many correction maps...
some are good, and you want to keep them.. but some may be bad because it will retard soi when you don't want to...
it is hard to know what were OEM intentions with every single correction of soi

Hello

Good job. The software is OK for me.



I am doing this calculations with an excel sheet.



Thanks

Alex.T wrote:I had to update it because Injection Duration map already has 20 columns, so you couldn't add more.
Now the limit is 30x30.
I also added 2 more config options: verbose mode and autoexit.

Hello for your fantastic work! It really makes things faster.
But you can increment the limit to 32x32? My duration map is 15x32 :lol: (BMW DDE 4.0)
It really is not important, so if is much work, you can forget what I said. :angel:
Regards and thanks.

Nice program - But does it take into account pre-injection? The duration maps will always show the duration for the complete injection amount, but remember that a few mm3 is usually subtracted from this and used as preinjection. Therefore the duration you need to use will depend on the pre-injection amount.... :angel:

Alex.T wrote:it's a nice research but there is one problem..
engine doesn't run with only soi map, there are many correction maps...
some are good, and you want to keep them.. but some may be bad because it will retard soi when you don't want to...
it is hard to know what were OEM intentions with every single correction of soi

Agreed. But without OEM damos no one is ever going to know all the corrections.
:?

Great work!

Could someone post some dyno results for best trq EOI ?

Thanks

hi, nice job ;) can you do one for calculate EOI of PD TDI engine? duration is in degrees

Thank you for the program, looking for such.